# Filtering or noise reduction/removal

## Subclass of:

## 702 - Data processing: measuring, calibrating, or testing

## 702001000 - MEASUREMENT SYSTEM IN A SPECIFIC ENVIRONMENT

## 702002000 - Earth science

## 702014000 - Seismology

### Patent class list (only not empty are listed)

#### Deeper subclasses:

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Document | Title | Date |
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20140005946 | ACOUSTIC SIGNAL PROCESSING USING MODEL-BASED ADAPTIVE FILTERING | 01-02-2014 |

20120035854 | SEISMIC ACQUISITION SYSTEM INCLUDING A DISTRIBUTED SENSOR HAVING AN OPTICAL FIBER - A seismic acquisition system includes a distributed optical sensor (having an optical fiber) and an interrogation subsystem configured to generate a light signal to emit into the optical fiber. The interrogation subsystem receives, from the distributed optical sensor, backscattered light responsive to the emitted light signal, wherein the backscattered light is affected by one or both of seismic signals reflected from a subterranean structure and noise. Output data corresponding to the backscattered light is provided to a processing subsystem to determine a characteristic of the subterranean structure. | 02-09-2012 |

20090276159 | MODELING AND FILTERING COHERENT NOISE IN SEISMIC SURVEYING - Seismic data collected by a group of seismic receivers is received, and properties of coherent noise for plural modes of the coherent noise based on the received seismic data are computed to produce a model of the coherent noise for the plural modes. Using the model, the coherent noise is simulated to generate a synthetic noise. | 11-05-2009 |

20160084977 | Deghosting With Adaptive Operators - Methods and apparatuses for processing marine seismic data with a process of combined deghosting and sparse T-p transformation. The process is formulated as an optimization problem. The optimization problem has an objective function that is a weighted sum of two norms: one norm is an Lp norm of the differences between the modeled data and acquired survey wherein the modeled data are derived from a model and a set of adaptive filters; the other norm is an Lq norm of the model; and the optimization variables and solutions are the coefficients of the model and coefficients of the adaptive filters. | 03-24-2016 |

20110010098 | METHOD OF PRE-STACK TWO-DIMENSION-LIKE TRANSFORMATION OF THREE-DIMENSIONAL SEISMIC RECORD - A method of pre-stack two-dimension-like transformation of three-dimensional seismic record is accomplished by the following steps: acquiring 3D seismic data, and arranging them according to a shot gather; calculating the offsets of all the receiver points from the first receiver line of the first shot; making a straight line (L | 01-13-2011 |

20160131782 | PARAMETER VARIATION IMPROVEMENT FOR SEISMIC DATA USING SENSITIVITY KERNELS - Methods and systems for optimizing the quantity and precision of processed seismic data based on reducing destructive interference of the seismic data. Sensitivity kernels are computed based on the medium of interest, e.g., source-receiver pairs, CDP collections and migrated collections, for a preselected wavefield parameter, e.g., travel-time, amplitude, slowness, etc., using a velocity model. Next, wavefield parameters are computed for a selected subset of the medium and are inverted or deconvolved with the sensitivity kernels to generate subsurface parameter variations. | 05-12-2016 |

20150066374 | SEISMIC DATA PROCESSING WITH FREQUENCY DIVERSE DE-ALIASING FILTERING - Performing seismic data processing using frequency diverse basis functions and converting a data processing problem into a one-norm or zero-norm optimization problem, which can be solved in frequency-space domain. The data processing problems can be data deghosting, data regularization or interpolation. The data being processed can be aliased or un-aliased, single sensor data or group-formed data, single component or multi-component data single source data or simultaneous sources, or some combinations. | 03-05-2015 |

20160084976 | PROCESSING OF MULTI-SENSOR STREAMER DATA - Presented are methods and systems for predicting a seismic data related quantity. The prediction is based on a linear least mean square estimate associated with covariance matrices. The application of a prediction error filter provides the ability to derive the prediction for aliased data samples. | 03-24-2016 |

20120089337 | MATCHING PURSUIT-BASED APPARATUS AND TECHNIQUE TO CONSTRUCT A SEISMIC SIGNAL USING A PREDICTED ENERGY DISTRIBUTION - A technique includes processing seismic data indicative of samples of at least one measured seismic signal in a processor-based machine to, in an iterative process, determine basis functions, which represent a constructed seismic signal. The technique includes in each iteration of the iterative process, selecting another basis function of the plurality of basis functions. The selecting includes based at least in part on the samples and a current version of the constructed seismic signal, determining a cost function; and interpreting the cost function based at least in part on a predicted energy distribution of the constructed seismic signal to select the basis function. | 04-12-2012 |

20110082647 | COMBINING SEISMIC DATA FROM SENSORS TO ATTENUATE NOISE - To perform noise attenuation for seismic surveying, a sensor assembly is deployed on a ground surface, where the sensor assembly has a seismic sensor to measure seismic waves propagated through a subterranean structure, and a divergence sensor comprising a pressure sensor to measure noise. First data is received from the seismic sensor, and second data is received from the divergence sensor. The first data and the second data are combined to attenuate noise in the first data. | 04-07-2011 |

20110046886 | Removing Ground-Roll from Geophysical Data - A method for processing geophysical data. The method includes generating a model from geophysical data acquired at a receiver location and one or more boundary receiver locations. After generating the model, the method applies a forward modeling algorithm using information from the model to generate a modeled estimate of a direct ground roll between the receiver location and each boundary receiver location. The method then estimates a ground roll between a source location and each boundary receiver location. Using the modeled estimate of a direct ground roll between the receiver location and each boundary receiver location and the estimate of the ground roll between a source location and each boundary receiver location, the method applies interferometry between the estimate of the ground roll between the source location and each boundary receiver location and the modeled estimate of the direct ground roll between the receiver location and each boundary receiver location to generate an interferometric estimate of a ground roll between the source location and the receiver location. The method then removes the interferometric estimate of the ground roll between the source location and the receiver location from geophysical data acquired at the receiver location due to a source at the source location. | 02-24-2011 |

20120143511 | REMOVING GROUND ROLL FROM GEOPHYSICAL DATA - Methods and systems for processing geophysical data are disclosed. In one embodiment, interferometry and modeling are used to generate and then remove estimates of ground roll between a source and one or more boundary locations. | 06-07-2012 |

20110060528 | NOISE ATTENUATION OF SEISMIC DATA - The present invention relates to a method of filtering seismic data for noise attenuation. An embodiment of the present invention provides a method of processing seismic data in which the seismic data is transformed into an f-x domain using a discrete Fourier transform and is then filtered at each discrete frequency using an infinite impulse response (HR) filter. | 03-10-2011 |

20140288841 | REMOVING NOISE FROM A SEISMIC MEASUREMENT - A technique includes using a filter having filtering parameters based at least in part on a dispersion curve of at least one vibration mode of a streamer to filter a measurement acquired by at least one sensor of the streamer and using results of the filtering to suppress vibration noise present in the measurement. | 09-25-2014 |

20090281732 | Method for attenuating low frequency noise in a dual-sensor seismic streamer - A calculated vertical velocity sensor signal is determined from a recorded pressure sensor signal. A constructed vertical velocity sensor signal is determined as a linear combination of the calculated vertical velocity sensor signal and a recorded vertical velocity sensor signal in dual-sensor seismic streamer data, using a mixture coefficient as a proportionality constant. An upgoing pressure wavefield component is determined as one half of a difference of the recorded pressure sensor signal and the constructed vertical velocity sensor signal, as a function of the mixture coefficient. An error in the upgoing pressure wavefield component is determined by propagating errors in the recorded pressure sensor signal and constructed vertical velocity sensor signal terms. A value of the mixture coefficient is determined that minimizes the error in the upgoing pressure wavefield component. | 11-12-2009 |

20140324357 | SEISMIC INTERFEROMETRY FOR GRAND ROLL & NOISE ATTENUATION - Methods of acquiring and processing seismic data using derivative sensors, such as strain sensors, that facilitate ground roll noise attenuation with seismic interferometry are disclosed. The methods use both seismic data and their spatial derivatives in computing ground-roll noises which are removed from processed seismic data. | 10-30-2014 |

20110004409 | METHOD FOR PERFORMING CONSTRAINED POLARIZATION FILTERING - An exemplary method for filtering multi-component seismic data is provided. The exemplary method comprises identifying a plurality of characteristics of the seismic data, the plurality of characteristics corresponding to a relative manifestation of surface wave noise on the different components and identifying a time-frequency boundary in the seismic data, the time-frequency boundary delineating portions of the seismic data estimated to contain surface wave noise ( | 01-06-2011 |

20120041682 | ATTENUATING INTERNAL MULTIPLES FROM SEISMIC DATA - A method for removing internal multiples from collected data, such as seismic data. The method includes predicting internal multiples for each horizon in a plurality of horizons that created the internal multiples. The internal multiples may be predicted from the seismic data in one pass. After predicting the internal multiples, the method includes creating a separate model of internal multiples for each horizon based on the predicted internal multiples for each horizon. The method then iteratively subtracts each separate model of internal multiples for each horizon from the seismic data. | 02-16-2012 |

20100312481 | MOVEOUT CORRECTION OF SEISMIC DATA - A method of processing seismic data including pressure data and pressure gradient data to obtain gradients of moveout corrected pressure data, comprising applying a move-out correction function to the pressure gradient data; and adding a correction term dependent on a moveout corrected time-derivative of the pressure data and a spatial derivative of the moveout correction function. The method may be used prior to any data processing algorithm which uses pressure gradient data in which moveout correction is applied prior to the algorithm, either because the algorithm makes a zero offset assumption or because it is beneficial for the algorithm to operate on moveout corrected data to reduce aliasing. | 12-09-2010 |

20100228486 | METHOD AND SYSTEM FOR SEISMIC DATA PROCESSING - The present invention relates to methods for data processing, particularly seismic data represented in three dimensions (3D). A method in accordance with one embodiment of the invention includes identifying extrema points from the 3D seismic data set; removing artificial distortion from 3D seismic data set; generating extrema cubes and derivatives along extrema points; estimating a class number associated with the extrema points; and determining number of classes and dynamically classifying extrema points. | 09-09-2010 |

20130311100 | MOVEOUT CORRECTION OF SEISMIC DATA - A method of processing seismic data including measurement data and their gradients to obtain gradients of move-out corrected data, comprising deriving gradients of the measurement data, deriving a first term comprising applying a move-out correction function to the measurement data; deriving a second term by applying the move-out correction function to the gradients and deriving gradients of move-out corrected data by adding the first term and the second term. The gradients of move-out corrected data are used to process physical properties of the earth's interior. The method may be used prior to any data processing algorithm which uses measurement gradient data in which move-out correction is applied prior to the algorithm, either because the algorithm makes a zero offset assumption or because it is beneficial for the algorithm to operate on move-out corrected data to reduce aliasing. | 11-21-2013 |

20160116620 | METHODS AND SYSTEMS FOR SEISMIC INVERSION AND RELATED SEISMIC DATA PROCESSING - A method and system of processing seismic data is presented. The method may include, for each of a plurality of seismic traces, generating a respective intermediate set of reflectivity coefficients and a partial deconvolution of an estimated wavelet from the respective seismic trace. The method may also include decomposing a model into a plurality of orthogonal components, and projecting each of a plurality of eigenvectors corresponding to one of the orthogonal components onto intermediate reflectivity coefficients corresponding with all of the plurality of seismic traces at each of a plurality of times to generate a plurality of eigen-coefficients associated with each of the plurality of times. The eigen-coefficients may be used to generate a plurality of basis coefficients, which may then be used to generate a respective updated set of reflectivity coefficients for each of the seismic traces. | 04-28-2016 |

20140316709 | COHERENT NOISE ATTENUATION - Methods and apparatuses for processing seismic data to generate images or determine properties of an interior section of the Earth. The seismic data is processed to filter coherent noise such as ground roll noise from seismic survey data. The noise is attenuated using 3D and/or 2D fan filters, which may have combined low-pass and band-pass filters derived from signal decomposition. The filters are designed with selected operator length, velocity bands of signals and noises and frequency range for a primary trace and adjacent traces within the operator length. The data is decomposed with the filters into signals and noises, and the noises are then filtered from the decomposed data. The process may be repeated for various frequencies and traces within the seismic data. The methods may be used for surveys that have either regular or irregular seismic receiver or seismic source positions. | 10-23-2014 |

20130245956 | NON-HYPERBOLIC CORRECTION OF SEISMIC DATA - A method for improving seismic images by correction of distortions in the underlying seismic data caused by a near-surface anomaly that produces a non-hyperbolic move-out component of the seismic reflection below the anomaly includes the steps of: a. redatuming the input seismic data to go from the surface to a target horizon using true one-way traveltime operators to provide a first new redatuming dataset; b. redatuming the input seismic data using hyperbolic one-way travel time operators to provide a second new redatuming dataset; and c. redatuming the combination of a first causal part of the first new redatuming dataset and an anti-causal second part of the second redatuming dataset to go from the target horizon back to the surface using hyperbolic one-way traveltime operators to provide a dataset that is referenced to the surface without an imprint of the anomaly. | 09-19-2013 |

20140244178 | SYSTEM AND METHOD FOR CORRECTING NEAR SURFACE STATICS BY USING INTERNAL MULTIPLES PREDICTION - Disclosed is a system and method for predicting internal multiples generators to correct near surface statics, by estimating a first timing or position associated with reflectors using internal multiple generators identified based on predictive deconvolution operators, estimating a second timing or position associated with the reflectors using the acquired seismic surface data, comparing the first timing or position with the second timing or position for each of the reflectors to determine a travel time delay associated with the reflectors, and correcting the acquired seismic surface data using the travel time delay. | 08-28-2014 |

20140121981 | REMOVING GHOST REFLECTIONS FROM MARINE SEISMIC DATA - Presented are methods and systems for deghosting seismic trace data. A cost function and one or more applicable constraints are selected and used to generate a time-variant deghosting filter. The time-variant deghosting filter can be recalculated for predetermined time intervals over the span of the associated seismic data. The time-variant deghosting filter is then applied to the seismic trace data to attenuate ghosts within the predetermined time interval. A plurality of seismic trace data can be stacked before generating and applying the time-variant deghosting filter. | 05-01-2014 |

20140297193 | SEISMIC METHODS AND SYSTEMS EMPLOYING SHALLOW SHEAR-WAVE SPLITTING ANALYSIS USING RECEIVER FUNCTIONS - Methods and systems for shallow shear-wave splitting analysis using receiver functions of seismic data are described. Radial and transverse receiver functions are calculating by, for example, performing cross-correlations of vertical component data with radial component data and vertical component data with transverse component data, respectively. The receiver functions are then used to determine orientation and other characteristics associated with shear waves passing through an azimuthally anisotropic layer. | 10-02-2014 |

20140297192 | SYSTEM AND METHOD FOR INTERPOLATING SEISMIC DATA BY MATCHING PURSUIT IN FOURIER TRANSFORM - Methods and systems for interpolating seismic data estimate a first frequency spectrum associated with the seismic data using a matching point (MP) algorithm having a pre-computed term. A second frequency spectrum is also estimate for the seismic data, using the MP algorithm, an anti-aliasing mask and the estimated first regular frequency spectrum. From the second frequency spectrum, the interpolated seismic data can be determined by performing an inverse fast Fourier Transform thereon. | 10-02-2014 |

20120259553 | Method for eliminating spectral constraints of acquisition system and earth filtering effects - Recorded seismic data are represented as a convolution of operators representing a reflectivity series of the earth and a seismic wavelet. The recorded seismic wavelet is represented as a convolution of operators representing a receiver ghost, a source ghost, a ghost-free source system response, an earth filter response, and a receiver system response. The operator representing the receiver ghost is removed from the convolution representing the seismic wavelet. The operator representing the source ghost is removed from the convolution representing the seismic wavelet. The operator representing the ghost-free source response is removed from the convolution representing the seismic wavelet. The operator representing the earth filter response is removed from the convolution representing the seismic wavelet. The operator representing the seismic wavelet is removed from the convolution representing the recorded seismic data. | 10-11-2012 |

20100161235 | Imaging of multishot seismic data - We here disclose methods of imaging multishot data without decoding. The end products of seismic data acquisition and processing are images of the subsurface. When seismic data are acquired based on the concept of multishooting (i.e., several seismic sources are exploited simultaneously or near simultaneously and the resulting pressure changes or ground motions are recorded simultaneously there are two possible ways to obtain images of the subsurface. One way consists of decoding multishot data before imaging them that is the multishot data are first converted to a new dataset corresponding to the standard acquisition technique in which one single shot at a time is generated and acquired and then second imaging algorithms are applied to the new dataset. Actually all seismic data processing packages available today require that multishot data be decoded before imaging them because they all assume that data have been collected sequentially. | 06-24-2010 |

20150066375 | SEISMIC NOISE REMOVAL - A method for removing seismic noise from an input seismic trace. The method may receive the input seismic trace. The method may receive one or more noise references for the input seismic trace. The method may receive one or more filters corresponding to the noise references. The method may apply a nonlinear function to the input seismic trace and to the one or more noise references to produce respective output signals for the input seismic trace and for the one or more noise references. The nonlinear function may be capable of determining higher-order statistics. The method may update the filters based on increasing one or more information attributes of the output signals to a predetermined threshold. The method may then filter noise corresponding to the noise references. | 03-05-2015 |

20120209531 | METHOD FOR STABILIZATION OF LOW FREQUENCIES IN TAU-P DOMAIN FILTERING AND DECONVOLUTION - Apparatuses and methods for collecting and analyzing seismic data (D) include a frequency dependent noise factor (ε | 08-16-2012 |

20140278119 | SEISMIC ACQUISITION USING PHASE-SHIFTED SWEEPS - A technique includes towing at least one seismic source in connection with a survey of a structure; and operating the seismic source(s) to fire shots, where each shot is associated with a frequency sweep. The technique includes varying phases of the frequency sweeps from shot to shot according to a predetermined phase sequence to allow noise in an energy sensed by seismic sensors to be attenuated. | 09-18-2014 |

20140200819 | HIGH-FIDELITY ADAPTIVE CURVELET DOMAIN PRIMARY-MULTIPLE SEPARATION PROCESSING OF SEISMIC DATA - Methods and systems for separating multiple events from primary events in noisy seismic data are described. Multiples are predicted and then the predictions are improved by least-square matching filtering in the space and time domain. An adaptive curvelet domain separation (ACDS) is then performed and the ACDS equation is solved with an iterative soft-thresholding technique. Further processing can be added to compensate for prediction inaccuracy or variable/excessive seismic data noise by dividing the seismic data into predetermined bands and processing each band independently. | 07-17-2014 |

20140200818 | SHEAR NOISE ATTENUATION AND DATA MATCHING FOR OCEAN BOTTOM NODE DATA USING COMPLEX WAVELET TRANSFORMS - Methods and systems for shear noise attenuation based on matching vertical particle velocity data and pressure data are described. The shear noise attenuation is based on the fact that different stages of the analysis can be performed with different numbers of wavelet orientations. The analysis is performed for frequency sub-bands for all wave numbers and vice versa. | 07-17-2014 |

20100070183 | DETERMINATION OF THE BEARING FROM A GEOPHONE TO A SEISMIC SOURCE - Techniques are disclosed for determining the bearing from a three-axis geophone to a seismic source, such as a person or other man-made seismic source. In one embodiment, the techniques are implemented as a method that includes receiving outputs from a three-axis geophone (x axis, y axis and z axis outputs), computing a magnitude signal based on the x and y axis outputs, determining locations of each local peak in the magnitude signal, computing a bearing estimate for each peak, and computing a median of the bearing estimates. The resulting median bearing is an estimate of the bearing from the geophone to a target seismic source. In one such case, computing the magnitude signal based on the x and y axis outputs is performed in response to detecting the target seismic source in the phase-shifted z axis output. | 03-18-2010 |

20140249759 | SEISMIC IMAGE FILTERING MACHINE TO GENERATE A FILTERED SEISMIC IMAGE, PROGRAM PRODUCTS, AND RELATED METHODS - Seismic image filtering machines, systems, program products, and computer implemented methods are provided to generate a filtered seismic image responsive to filtered seismic image data generated by attenuating coherent seismic noise from surface waves of an unfiltered wavefield constructed from unfiltered seismic image data through a single downward extrapolation of the unfiltered wavefield using a plurality of nonstationary convolution operators to perform localized filtering at each of a plurality of spatial locations of the unfiltered wavefield. Various embodiments, for example, can beneficially handle strong lateral velocity variations thus making various embodiments effective tools to remove complicated coherent seismic noise which is typically in the form of exponentially decaying evanescent waves. Embodiments of the present invention, for example, can use, as a part of the filtering mechanism, specially designed nonstationary convolution operators that are implemented in the space-frequency domain as nonstationary filters. | 09-04-2014 |

20140188395 | SYSTEM AND METHOD FOR REMOVAL OF JITTER FROM SEISMIC DATA - A system and method are provided for reducing jitter in collected seismic data. The collected seismic data includes both original seismic data, e.g., original traces, and other seismic data, e.g., interpolated traces. The collected seismic data is filtered to form filtered seismic data, and then the original seismic data is re-inserted into the filtered seismic data. Filtering is repeated on the result based, for example, on one or more filter thresholds that progressively relax constraints on the filtering process, until the filtered data can be combined with the original seismic data with a good fit or a predetermined, e.g., user determined, number of times. | 07-03-2014 |

20140288842 | METHOD AND DEVICE FOR ATTENUATING RANDOM NOISE IN SEISMIC DATA - Methods and devices for seismic data processing attenuate noise by replacing an attribute value v(i) of a selected data point i with a weighted average {circumflex over (ν)}(i) of attribute values of data points j from a window that includes the selected data point i. The contribution to the weighted average of an attribute value v(j) corresponding to a data point j depends on how similar attribute values in the neighborhood N | 09-25-2014 |

20150346369 | METHODS AND APPARATUS FOR COOPERATIVE NOISE ATTENUATION IN DATA SETS RELATED TO THE SAME UNDERGROUND FORMATION - Cooperative attenuation methods are applied to data sets acquired by surveying a same underground formation which therefore include substantially the same primary signal and different individual noise. The data sets are converted in a wavelet basis by applying a high angular resolution complex wavelet transform. When corresponding coefficients of the data set representations in the wavelet basis differ more than predefined thresholds the coefficients are attenuated as corresponding to noise. | 12-03-2015 |

20100114495 | Seismic Image Filtering Machine To Generate A Filtered Seismic Image, Program Products, And Related Methods - Seismic image filtering machines, systems, program products, and computer implemented methods are provided to generate a filtered seismic image responsive to filtered seismic image data generated by attenuating coherent seismic noise from surface waves of an unfiltered wavefield constructed from unfiltered seismic image data through a single downward extrapolation of the unfiltered wavefield using a plurality of nonstationary convolution operators to perform localized filtering at each of a plurality of spatial locations of the unfiltered wavefield. Various embodiments, for example, can beneficially handle strong lateral velocity variations thus making various embodiments effective tools to remove complicated coherent seismic noise which is typically in the form of exponentially decaying evanescent waves. Embodiments of the present invention, for example, can use, as a part of the filtering mechanism, specially designed nonstationary convolution operators that are implemented in the space-frequency domain as nonstationary filters. | 05-06-2010 |

20130173169 | METHOD AND SYSTEM FOR EFFICIENT WAVELENGTH EXTRAPOLATION - The current application is directed to computational systems and methods carried out by the computational systems for characterizing and/or imaging subsurface features based on digitally encoded data collected during exploration-seismology experiments. In particular, the current application is directed to computationally efficient methods and systems for processing data collected across a two-dimensional surface to produce, by stepwise propagation, a digitally encoded, stored-data representation of a three-dimensional pressure wavefield that is used in many different applications. In certain applications, the stored-data representation of a three-dimensional pressure wavefield is used, along with initial values and a portion of the boundary conditions, to solve for unknown portions of boundary conditions, including the structures and distributions of subsurface features and materials. | 07-04-2013 |

20140303898 | DEVICE AND METHOD FOR DE-BLENDING SIMULTANEOUS SHOT DATA - Device, medium and method for de-blending seismic data. The method for de-blending seismic data associated with a subsurface of the earth includes receiving initial seismic traces recorded by plural sources; de-blending, in a processor, the initial seismic traces to generate de-blended seismic traces; and generating an image of the subsurface based on the de-blended seismic traces. The initial seismic traces include uncontaminated portions corresponding to time intervals substantially free from cross-talk from other sources, and the uncontaminated portions are used to remove cross-talk noise on other initial seismic traces. | 10-09-2014 |

20130282292 | PREMIGRATION DEGHOSTING OF SEISMIC DATA WITH A BOOTSTRAP TECHNIQUE - Methods and systems for optimized receiver-based ghost filter generation are described. The optimized ghost filter self-determines its parameters based on an iterative calculation of recorded data transformed from a time-space domain to a Tau-P domain. An initial ghost filter prediction is made based on generating mirror data from the recorded data and using a least squares technique during a premigration stage. | 10-24-2013 |

20150338538 | MULTI-MODEL SEISMIC PROCESSING OPERATION - Systems and methods for seismic processing are provided. For example, the method may include modeling seismic data as a combination of a modeling matrix and a parameter vector, and determining a plurality of solution spaces of filter models for the parameter vector. The method may also include calculating data residual terms for the filter models, wherein the data residual terms are related to a difference between the seismic data and a combination of the modeling matrix and the parameter vector determined using the filter models. The method may further include selecting a solution filter model for the parameter vector from among the filter models based on a combination of the data residual terms and complexities of the filter models, and performing a seismic processing operation using the solution filter model and the seismic data. | 11-26-2015 |

20150338537 | NOISE ATTENUATION OF MULTICOMPONENT MICROSEISMIC DATA - A method for processing microseismic data, comprises: receiving the microseismic data acquired by one or more multicomponent sensors; convolving the microseismic data with an operator that is applied to all of the components of the microseismic data; and applying a multicomponent filter operator to the convolved microseismic data. The microseismic data may result from human activity or be entirely natural. The filtering preserves the polarity of the received data whilst improving the signal-to-noise ratio of the filtered data. | 11-26-2015 |

20130253838 | SYSTEM AND METHOD FOR PROCESSING 4D SEISMIC DATA - A system and method for determining a 4D difference from 4D seismic data including receiving a baseline seismic dataset and a monitor seismic dataset; identifying a 4D signal present in the monitor seismic dataset to create a 4D monitor dataset and a signal in the baseline seismic dataset which matches the monitor seismic dataset to create a baseline matching signal dataset; differencing the baseline matching signal dataset and the baseline seismic dataset to create a 4D baseline dataset; and differencing the 4D baseline dataset and the 4D monitor dataset to create a 4D difference dataset. In an embodiment, a multi-scale, multi-directional transform is used to identify the 4D signal present in the monitor seismic dataset and the signal in the baseline seismic dataset which matches the monitor seismic dataset. | 09-26-2013 |

20140324358 | SURFACE MULTIPLE PREDICTION - Methods and computing systems for processing collected data are disclosed. In one embodiment, a method is provided for predicting a plurality of surface multiples for a plurality of target traces in a record of multi-component seismic data acquired in a survey area. The method may select a target trace. The method may select an aperture of potential downward reflection points for the target trace. The method may calculate dip propagation attributes from the multi-component seismic data. The method may map the dip propagation attributes into a multiple contribution attribute gather based on the aperture. The method may modify the aperture based on the multiple contribution attribute gather. The method may then predict multiples for the selected target trace using the modified aperture. | 10-30-2014 |

20140379266 | PROCESSING SURVEY DATA CONTAINING GHOST DATA - Input survey data containing ghost data is processed, the ghost data containing data caused by a reflection from an interface, and the processing including performing full wave propagation. An output is produced in response to the processing. | 12-25-2014 |

20160139283 | SEISMIC WAVEFIELD DEGHOSTING AND NOISE ATTENUATION - A method can include receiving measured values that include representations of constructive interference and destructive interference from an upgoing wavefield and a downgoing ghost wavefield reflected from a sea surface; and estimating at least one of the wavefields with attenuated noise. | 05-19-2016 |

20150355357 | PREMIGRATION DEGHOSTING FOR MARINE STREAMER DATA USING A BOOTSTRAP APPROACH IN TAU-P DOMAIN - Methods and systems for optimized receiver-based ghost filter generation are described. The optimized ghost filter self-determines its parameters based on an iterative calculation of recorded data transformed from a time-space domain to a Tau-P domain. An initial ghost filter prediction is made based on generating mirror data from the recorded data and using a least squares technique during a premigration stage. | 12-10-2015 |

20150355351 | System and Method for Generating and Controlling Conducted Acoustic Waves for Geophysical Exploration - An improved seismic impulse acquisition system involves an array of seismic sources comprising direct detonation overpressure wave generators that are geographically scattered, an array of echo detectors configured to detect said seismic impulses imparted by each seismic source of said array of seismic sources, a data recorder, said array of echo detectors being connected to said data recorder, a control system, and a network that connect the array of seismic sources and the array of echo detectors to said control system. Each seismic source imparts seismic impulses into a target media in accordance with a respective code sequence of a plurality of code sequences, wherein the location of each seismic source and each echo detector at a given time is known relative to an established coordinate system. The various coded sequences of seismic pulses are used to process the data received by the data recorder from the array of echo detectors. | 12-10-2015 |

20090299639 | 3D RESIDUAL BINNING AND FLATNESS ERROR CORRECTION - A method for processing seismic data. The method may include splitting the seismic data into multiple datasets according to one or more offsets; determining a first shift amount in three or more dimensions of the seismic data between a dataset having a first offset and a dataset having a second offset, determining a second shift amount in the three or more dimensions between the dataset having the second offset and a dataset having a third offset, determining a cumulative shift amount based on a shift of the first shift amount and the second shift amount and determining a corrected dataset based on the dataset having the third offset and the cumulative shift amount. | 12-03-2009 |

20140288843 | VECTOR-DIP FILTERING OF SEISMIC DATA IN THE TIME-FREQUENCY DOMAIN - Methods and systems for separating surface wave velocity information from surface wave noise in seismic data are described. The seismic data can be comprised of irregularities in spatial sampling, non-stationarity in time and non-stationarity in frequency. The methods and systems can then be adapted to create a multi-component dip filter that removes high amplitude dispersive noise from the seismic data based on the use of slant stacking. | 09-25-2014 |

20130030710 | SYSTEM AND METHOD FOR PERTURBING AN INITIAL HORIZON-PICKING SOLUTION TO FOLLOW LOCAL FEATURES OF A VOLUME - A horizon-picking solution for a geological volume of interest is determined. To determine the horizon-picking solution, a plurality of horizons through the geological volume of interest included in an initial horizon-picking solution are perturbed to more closely follow the local character of measured data related to the geological volume of interest. In particular, the horizons may be perturbed simultaneously by blending the initial solution with a secondary horizon-picking solution that automatically identifies a plurality of horizons through the geological volume of interest that follow the measured data related to the geological volume of interest. | 01-31-2013 |

20120046871 | METHOD FOR TIME PICKING AND ORIENTATION OF THREE-COMPONENT SEISMIC SIGNALS IN WELLS - A method, having application to petroleum exploration or production, for picking the arrival time of seismic waves and use thereof for orienting the components of a multi-component sensor. After acquisition of seismic data using a VSP type method, with a multi-component sensor, a module signal is constructed by calculating the square root of the sum of the squares of at least two orthogonal seismic components. Arrival times of a direct seismic wave are then picked on an amplitude extremum of this module signal. Based on this picking, the seismic components can then be oriented in a unique reference frame whatever the depth of the sensor. A time window is defined on either side of the picked arrival times and the azimuthal direction is determined by maximizing the energy of the horizontal components within this time window. Finally, the three components are oriented in a reference frame defined with respect to the azimuthal direction, which is identical for each depth. | 02-23-2012 |

20140278118 | SYSTEM AND METHOD FOR ATTENUATING NOISE IN SEISMIC DATA - A system and method for attenuating noise in seismic data representative of a subsurface region of interest including receiving a seismic dataset representative of seismic signal or seismic noise and a seismic dataset representative of seismic signal and noise, transforming them into a domain were they have sparse or compressible representation, comparing the sets of coefficients to identify desirable coefficients in the set of coefficients representing the signal and noise dataset, selecting the desirable coefficients to produce an improved set of coefficients, and inverse transforming the improved set of coefficients to produce a modified seismic dataset. The modified seismic dataset may be noise-attenuated seismic data or may be a noise model that is subtracted from the original data to produce noise-attenuated data. | 09-18-2014 |

20130226463 | METHODS AND SYSTEMS FOR DEGHOSTING MARINE SEISMIC WAVEFIELDS USING COST-FUNCTIONAL MINIMIZATION - Computational systems and methods for deghosting marine seismic streamer data using cost-functional minimization are disclosed. In one aspect, the method computationally transforms recorded wavefield data from the space-time domain to a wavenumber-frequency domain and computationally deghosts the wavefield data in the wavenumber-frequency domain. The deghosted wavefield data may then computationally transformed from the wavenumber-frequency domain back to the space-time domain and stored. The computational methods include iterative minimization of a cost functional in the wavenumber-frequency domain. | 08-29-2013 |

20130226462 | METHODS AND APPARATUS FOR AUTOMATED NOISE REMOVAL FROM SEISMIC DATA - Disclosed are methods and apparatus for noise removal from seismic data. In one embodiment, a seismic data set comprising a plurality of traces is received, and noise metrics for the seismic data set are computed using a set of time and depth windows. The seismic data set is scanned to determine a first set of groups. Each group in the first set comprises at least a first minimum number of neighboring traces for which at least one of the noise metrics is outside a predefined specification. Noise attenuation is applied to the traces in the first set of groups. Other embodiments, aspects, and features are also disclosed. | 08-29-2013 |

20140200820 | WAVEFIELD EXTRAPOLATION AND IMAGING USING SINGLE- OR MULTI-COMPONENT SEISMIC MEASUREMENTS - Described herein are architectures, platforms, computing systems, and methods for mitigating noise in wavefield extrapolation and imaging. In one aspect, a method of wavefield extrapolation is provided that includes receiving data representing at least one measurement of pressure wavefield or particle motion wavefield; modeling the received data as a sum of signal and noise; providing a noise model to components of the received data; and weighting the measured components of the received data to reduce the impact of noise of results of the wavefield extrapolation. | 07-17-2014 |

20110276274 | Seismic Interference Noise Elimination - An automatic and robust method to attenuate seismic interference noises in marine seismic survey using multi-dimensional filters in Tau-P domain to identify and isolate seismic interference noises as anomalies. | 11-10-2011 |

20120065891 | SYSTEM, MACHINE, AND COMPUTER-READABLE STORAGE MEDIUM FOR FORMING AN ENHANCED SEISMIC TRACE USING A VIRTUAL SEISMIC ARRAY - Embodiments of a system are provided for forming enhanced seismic array traces using virtual seismic sensors in addition to the real seismic sensors to form a virtual seismic array. The system receives the signal responses from the real sensors, processes the signal responses from the sensors to define virtual signals using a narrowband decomposition of the complex envelope of the sensor signal responses, calculates second- and fourth-order statistics to derive steering vectors for the array of real sensors, and forms a virtual seismic array in response thereto. Machines, computer program product, and computer-implemented methods are provided for forming enhanced seismic array traces by receiving the array responses from sensors, processing the signals to define virtual sensor signals and a virtual seismic array, and forming an array response for the virtual seismic array to form a seismic trace of enhanced resolution. | 03-15-2012 |

20150362610 | METHOD OF SUPPRESSING SPECTRAL ARTEFACTS OF WAVEFIELD DECOMPOSITION CAUSED BY IMPERFECT EXTRAPOLATION - Artefacts arising from imperfect extrapolation of a data set subjected to filtering operation are removed by forming a model of the extrapolated data, performing a filtering process on the model and the data set to form a filtered model and a filtered data set, and adaptively subtracting the filtered model from the filtered data set. The adaptive subtraction may employ a least-square error filter. | 12-17-2015 |

20150032380 | PLURAL DEPTH SEISMIC DE-GHOSTING METHOD AND SYSTEM - A method for de-ghosting seismic data includes receiving seismic data corresponding to plural depth sources or plural depth receivers located at a first depth and a second depth below a geophysical surface, wherein the second depth is below the first depth, where the plural depth sources or plural depth receivers comprise a first seismic receiver located at the first depth and a second seismic receiver located at the second depth, or, a first seismic source located at the first depth and a second seismic source located at the second depth. The method also includes aligning primary reflections within the seismic data to provide improved seismic data. A corresponding system is also disclosed herein. | 01-29-2015 |

20140365135 | COHERENT NOISE ATTENUATION METHOD - Computing device, computer instructions and method for denoising input seismic data d. The method includes receiving the input seismic data d recorded in a first domain by seismic receivers, wherein the input seismic data d includes pure seismic data ss relating to an exploration source and coherent noise data n generated by a man-made device; generating a model m in a second domain to describe the input seismic data d; and processing the model m to obtain an output seismic dataset d′ indicative of seismic data substantially free of the coherent noise data n generated by the man-made device. | 12-11-2014 |

20140244179 | CONSTRUCTION AND REMOVAL OF SCATTERED GROUND ROLL USING INTERFEROMETRIC METHODS - A data set can be corrected for the effects of interface waves by interferometrically measuring an interface wavefield between each of a plurality of planned locations within a survey area; and correcting survey data acquired in the survey area for the interface waves. The interface wavefield may be interferometrically measured by receiving a wavefield including interface waves propagating within a survey area, the survey area including a plurality of planned survey locations therein; generating interface wave data representative of the received interface wavefield; and constructing a Green's function between each of the planned survey positions from the interface wave data. Other aspects include an apparatus by which the interface wavefield may be interferometrically measured and a computer apparatus programmed to correct the seismic data using the interferometrically measured interface wave data. | 08-28-2014 |

20160109597 | DEVICE AND METHOD FOR OPTIMIZATION OF 4D AND 3D SEISMIC DATA - A method and apparatus for noise attenuation. The method includes receiving seismic data associated with at least two vintages (d | 04-21-2016 |

20150316674 | SYSTEMS AND METHODS FOR MULTI-VOLUME DIRECTIONAL DE-NOISING - Systems and methods are provided for directional de-noising on seismic data recorded byseismic receivers. A method includes: receiving a seismic dataset, wherein the seismic dataset includes a model dataset and an input dataset to filter; decomposing the model dataset into a plurality of model directions, identifying which of the model directions to keep; and mapping the input dataset along the identified model directions resulting in a filtered output. | 11-05-2015 |

20100286922 | METHOD FOR DETECTING AND/OR PROCESSING SEISMIC SIGNALS - Method for detecting and/or processing seismic signals, for example acoustic and/or elastic waves, generated by a plurality of seismic and/or acoustic sources and acquired by a plurality of seismic and/or acoustic sensors disposed in/on the subsurface, which provides at least a step in which at least a convolution operation is performed, applied to the seismic signals, having an orientation concordant with the orientation of the time axis, to obtain a signal assimilable to a seismic signal reflected by a reflector element disposed in correspondence with the seismic and/or acoustic sensors of the seismic and/or acoustic sources. | 11-11-2010 |

20100286921 | Surface Wave Mitigation In Spatially Inhomogeneous Media - Embodiments are directed to systems and methods ( | 11-11-2010 |

20100286920 | Method for calculation of seismic attributes from seismic signals - Filters are applied to seismic signals representative of subsurface formations to generate filtered signals with attenuated spatially aliased energy. The filtered signals are multiplied in the frequency-wavenumber domain by a complex function of frequency and wavenumber representing the seismic attribute in the frequency-wavenumber domain, to generate scaled signals. The scaled signals, transformed to the time-space domain, are divided by the filtered signals in the time-space domain, to a seismic attribute useful for identifying and characterizing the subsurface formations. | 11-11-2010 |

20120245851 | NOISE FILTERING OF SEISMIT DATA - Adaptive filtering method to remove ground roll from seismic data. In an M channel adaptive filter, weights W | 09-27-2012 |

20150301209 | Estimating A Wavefield For A Dip - At least one dip is determined using an estimator for the at least one dip based on measured multicomponent survey data. At least one wavefield for the at least one dip is estimated using a processing technique that employs matching pursuit. | 10-22-2015 |

20120271551 | Seismic Data Filtering Based on Vibrator-Coupled Ground Model - A vibrator-coupled ground filter improves seismic data recorded during a seismic operation. This filter is based on a ground model that takes into consideration the vibrator system, the coupling system between the baseplate and captured ground, and the coupled ground system. Using acceleration data from the baseplate and the reaction mass, the ground model can be used to derive particular variables for the ground model to help characterize the system. Using the derived variables in a ground filter, the recorded seismic data can be corrected to remove errors in the trace data produced by typical assumptions. | 10-25-2012 |

20160061973 | METHODS AND SYSTEMS THAT DETERMINE A VELOCITY WAVEFIELD FROM A MEASURED PRESSURE WAVEFIELD - Methods and systems that compute an approximate vertical-velocity wavefield based on a measured pressure wavefield and knowledge of the free-surface shape when the pressure wavefield was measured are described. The measured pressure wavefield is used to compute an approximate frozen free-surface profile of the free surface. The approximate frozen free-surface profile and the measured pressure wavefield are then used to compute an approximate vertical-velocity wavefield that does not include low-frequency streamer vibrational noise. The approximate vertical-velocity wavefield and measured pressure wavefield may be used to separate the pressure wavefield into up-going and down-going pressure wavefields. | 03-03-2016 |

20160061977 | IMPACT ASSESSMENT OF MARINE SEISMIC SURVEYS - Methods and systems to assess in near real-time defects in seismic data resulting from noise and seismic data acquisition-system deviations during a marine survey are disclosed. Methods and systems apply forward modeling to a model of a subterranean formation to generate synthetic seismic data based on the noise and deviations in the seismic data acquisition system. The synthetic seismic data represents the seismic data that would be collected by a marine survey carried out on a subterranean formation with the same structure as the Earth model and includes defects that result from the noise and deviations in the seismic data acquisition system. Error estimation is applied to the synthetic seismic data in order to assess the defects at different stages of seismic data processing. | 03-03-2016 |

20120330554 | Dispersion Estimation By Nonlinear Optimization of Beam-Formed Fields - A method for estimating velocity dispersion in seismic surface waves in massive 3-D data sets ( | 12-27-2012 |

20120271552 | INCREASING THE RESOLUTION OF VSP AVA ANALYSIS THROUGH USING BOREHOLE GRAVITY INFORMATION - An apparatus and method for estimating at least one parameter of interest for an earth formation by reducing an uncertainty in seismic parameters using density information. The density information may be acquired from borehole gravity information. The method may include inverting seismic parameters while using density information obtained from borehole gravity information. The method may also include joint inversion of seismic parameters with density information. The apparatus may include a gravimeter and a processor configured to estimate the parameter of interest using the seismic parameters and density information. | 10-25-2012 |

20140088879 | SYSTEM AND METHOD FOR NOISE ATTENUATION IN SEISMIC DATA - A system and method for processing a prestack seismic dataset with at least one smoothly varying (redundant) axis including transposing the prestack seismic dataset, slicing the prestack seismic dataset into depth or time slices with at least one redundant axis, processing the slices, and transposing the slices to create a processed seismic dataset. The redundant axis may be representative of offset, angle, azimuth, or time between time-lapse surveys. The processing may include filtering the slices to attenuate coherent or incoherent noise. | 03-27-2014 |

20140095079 | SYSTEM AND METHOD FOR THREE-DIMENSIONAL ITERATIVE FILTERING OF SCATTERED WAVES IN CROSS SPREAD SEISMIC SYSTEMS - A system and method are provided for filtering scatterer noise energy from land seismic waves using three dimensional (3D) iterative filtering in a cross-spread source-receiver pattern. The system and method isolate scatterer noise energy associated with a scatterer based on a filtering process performed using a scatterer referential time delay. Then, the isolated scatterer noise energy can be subtracted from the surface wave data. This process can be repeated for each scatterer in the covered area to remove each of their contributions, and can be performed, for example, after a preliminary filtering of the surface wave data using 3D fk filtering or the like. | 04-03-2014 |

20140114578 | SEISMIC SOURCE AND METHOD FOR INTERMODULATION MITIGATION - A method for calculating intermodulation noise generated with one or more land seismic sources. The method includes receiving seismic data generated by actuating the one or more land seismic source with a first sweep and a second sweep; calculating with a computing device a first earth response corresponding to the first sweep; calculating with the computing device a second earth response corresponding to the second sweep; and calculating the intermodulation noise based on the first and second earth responses. The second sweep is a time reverse sweep of the first sweep. | 04-24-2014 |

20140019058 | IMPROVED TIME-BASED PROCESSING OF BROADBAND BOREHOLE ACOUSTIC DATA - Methods and systems for improving time-semblance processing of acoustic data are disclosed. Acoustic data is obtained from a tool in a formation. A delay filter is then designed and applied to the obtained acoustic data to obtain delayed acoustic data. Time semblance is then applied to this delayed acoustic data. | 01-16-2014 |

20130238248 | Methods and Apparatus for Waveform Processing - Methods and apparatus for waveform processing are disclosed. An example method includes determining shrinkage estimators in a Discrete Radon transform domain based on semblance of waveform data and de-noising the waveform data using a processor and the shrinkage estimators to enable the identification of weak signals in the waveform data. | 09-12-2013 |

20110166790 | Seismic Processing for the Elimination of Multiple Reflections - Seismic processing method, in which, in order to eliminate multiple reflections on seismic data, seismic data are migrated in time or in depth ( | 07-07-2011 |

20110178715 | DIP-based corrections for data reconstruction in three-dimensional surface-related multiple prediction - A best fitting trace in seismic data is determined for a desired trace to be reconstructed. A dip-based correction is calculated per trace and per sample for differences in azimuth, common midpoint coordinates, and offset between the best fitting trace and the desired trace. The dip-based correction is applied to the best fitting trace to reconstruct the desired trace for 3D surface-related multiple prediction. | 07-21-2011 |

20110178714 | Deghosting and Interpolating Seismic Data - A technique includes receiving seismic data indicative of measurements acquired by seismic sensors. The measurements are associated with a measurement noise. The technique includes estimating at least one characteristic of the measurement noise and deghosting the seismic data based at least in part on the estimated characteristic(s) of the measurement noise. | 07-21-2011 |

20110270527 | System and method for compensating time and offset varying near-surface effects in seismic data background - A system for and computer implemented method for transforming seismic trace information includes obtaining seismic trace information for each trace, the seismic trace information including shot to receiver offset and the vertical velocity of at least one subsurface primary reflector and including respective information resulting from near-surface layering and velocity effects and relating to the primary reflector, reversibly transforming seismic trace information from each non-zero offset trace such that the respective information resulting from the near-surface effects at each non-zero offset position is moved in a time dimension such that they become effectively periodic with respect to respective primary reflector information and in accordance with a periodicity for a zero offset trace at the same surface location, filtering the transformed seismic trace information to remove at least a portion of the information resulting from near-surface effects, and inverting the reversible transforming. | 11-03-2011 |

20090005999 | Limited radon transformations for removal of noise from seismic data - Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. The methods comprise the steps of assembling seismic data into common geometry gathers in an offset-time domain without correcting the data for normal moveout. The amplitude data are then transformed from the offset-time domain to the time-slowness domain using a limited Radon transformation. That is, the Radon transformation is applied within defined slowness limits p | 01-01-2009 |

20080255761 | INVERSE-VECTOR METHOD FOR SMOOTHING DIPS AND AZIMUTHS - A system and method using inverse-vector processing to iterate through a loop of three steps: set a guide direction, invert opposite vectors, and average vectors to update the guide direction, for smoothing seismic amplitude data. The inverse-vector method can overcome instabilities where the traditional structure-tensor approach fails. The inverse-vector smoothing is simple to implement and more computational efficient. The resultant dips and azimuths are spatially consistent and thus more interpretable and suitable for calculation of curvature and other dip based attributes. | 10-16-2008 |

20090099779 | AUTONOMIC SEISMIC DATA PROCESSING - Implementations of various technologies for a method for processing seismic data. In one implementation, the method may include receiving a record of seismic data. The record of seismic data may have a plurality of attributes. A first seismic data process may be performed on the record of seismic data. The first seismic data process may generate a plurality of datasets. A selection of a portion of the plurality of attributes for ranking the datasets may be received. A quality score may be determined for each attribute of the portion of the plurality of attributes for each dataset. A ranking may be determined for each dataset based on the quality score. | 04-16-2009 |

20090222211 | METHOD, PROGRAM PRODUCT, AND SYSTEM FOR SUPPRESSION OF RESIDUAL WATER BOTTOM ENERGY IN SURFACE SEISMIC DATA - Systems, program product, and methods of suppressing residual water bottom energy in seismic data, are provided. An example of a system, program product, and method can be applied to post-stack datasets and can combine multi-channel deconvolution with novel sorting keys to efficiently identify and suppress residual water bottom energy in common depth point (CDP) stacked seismic data, thereby increasing the resolving power of seismic data leading to an improved interpretation of seismic signals reflected from oil reservoirs. | 09-03-2009 |

20080306693 | Seismogram Correction for Absorption Effects - Method for correcting seismograms to compensate for absorption effects that occur in the earth. In one implementation, the method may include computing a ratio of traveltime to absorption parameter for each seismogram to generate a system of linear equations. The ratio is expressed as a linear equation having a plurality of components. The method may further include solving the system of linear equations for the plurality of components, adding one or more of the solved components to generate an estimate of the ratio of traveltime to absorption parameter, and correcting the seismograms using the estimate of the ratio of traveltime to absorption parameter. | 12-11-2008 |

20090171588 | Attenuating Noise in Seismic Data - Noise may be filtered or attenuated from seismic data by building a four-dimensional volume using the acquired seismic data and then applying a random noise attenuation filter to the four-dimensional volume. The dimensions of the four-dimensional volume may include a trace number dimension, a time dimension, a shot number dimension, and a cable number dimension. The random noise attenuation filter may filter portions of the acquired seismic data if the seismic data is not correlated with respect to other seismic data in the four dimensional volume. | 07-02-2009 |

20090006000 | Method for velocity analysis using waveform inversion in laplace domain for geophysical imaging - A Laplace transform system comprising a processor, a measured time domain wavefield, a velocity model, and Laplace damping constants, wherein the processor is programmed to calculate a substantially about zero frequency component of a Fourier transform of a time domain damped wavefield, wherein the time domain damped wavefield is damped by the Laplace damping constants to obtain long wavelength velocity information for deeper subsurface regions. | 01-01-2009 |

20080270035 | System and Technique to Remove Perturbation Noise from Seismic Sensor Data - A technique includes obtaining a noise measurement, which is acquired by a seismic sensor while in tow. Based on the noise measurement, a compensation for at least one of an alignment of the sensor and a calibration of the sensor is determined. | 10-30-2008 |

20080221801 | GEOPHONE NOISE ATTENUATION AND WAVEFIELD SEPARATION USING A MULTI-DIMENSIONAL DECOMPOSITION TECHNIQUE - Methods and apparatus for processing dual sensor (e.g., hydrophone and vertical geophone) data that includes intrinsic removal of noise as well as enhancing the wavefield separation are provided. The methods disclosed herein are based on a decomposition of data simultaneously into dip and frequency while retaining temporal locality. The noise removed may be mainly coherent geophone noise from the vertical geophone, also known as V(z) noise. | 09-11-2008 |

20080294347 | METHOD OF AND APPARATUS FOR PROCESSING SEISMIC DATA - A method of acquiring or processing multi-component seismic data obtained from seismic signals propagating in a medium, the method comprising the steps of: selecting a first portion of the seismic data in which the first arrival contains only upwardly propagating seismic energy above the seafloor; and determining a first calibration filter from the first portion of the seismic data, the first calibration filter being to calibrate a first component of the seismic data relative to a second component of the seismic data. | 11-27-2008 |

20080294346 | METHOD FOR IDENTIFYING AND REMOVING MULTIPLES FOR IMAGING WITH BEAMS - The present invention incorporates the use of model-driven and data-driven methodologies to attenuate multiples in seismic data utilizing a prediction model which includes multiply-reflected, surface-related seismic waves. The present invention includes beam techniques and convolving a predicted multiples beam with a segment of a modeled pegleg beam to obtain a convolved multiples beam. The convolved multiples beam can then he deconvolved to attenuate the multiples that are present in the original input beam. | 11-27-2008 |