Class / Patent application number | Description | Number of patent applications / Date published |
367041000 | Transmitted correlation | 20 |
20090010103 | EFFICIENT SEISMIC DATA ACQUISITION WITH SOURCE SEPARATION - A method for the simultaneous operation of multiple seismic vibrators using unique modified pseudorandom sweeps and recovery of the transmission path response from each vibrator is disclosed. The vibrator sweeps are derived from pseudorandom binary sequences modified to be weakly correlated over a time window of interest, spectrally shaped and amplitude level compressed. Cross-correlation with each pilot signal is used to perform an initial separation of the composite received signal data set. Recordings of the motion of each vibrator are also cross-correlated with each pilot, windowed, and transformed to form a source cross-spectral density matrix in the frequency domain useful for source signature removal and for additional crosstalk-suppression between the separated records. After source signature removal in the frequency domain an inverse transform is applied to produce an estimate of each source-to-receiver earth response in the time domain. The method has application to both land and marine geophysical exploration. | 01-08-2009 |
20090116337 | METHOD AND APPARATUS FOR MINIMIZING INTERFERENCE BETWEEN SEISMIC SYSTEMS - A method and apparatus for minimizing interference between seismic systems. The method may generally include: (a) actuating a plurality of first sources associated with a first seismic system to generate a first plurality of phase-encoded vibratory signals; (b) actuating a plurality of second sources associated with a second seismic system to generate a second plurality of phase-encoded vibratory signals that are at least partially frequency separated from the first plurality of phase-encoded vibratory signals generated in (a); and (c) detecting the first and second plurality of phase-encoded vibratory signals utilizing a first receiver positioned at a location remote from the first and second sources. | 05-07-2009 |
20090251994 | SEISMIC VIBRATOR ARRAY AND METHODS OF OPERATION - An arrangement for conducting a seismic survey and methods for operating a vibrator array in a seismic survey. A signal source coupled to an array of vibrators drives the vibrators with a set of signals to generate seismic signals into a survey area. Each of the signals of the set has an autocorrelation function and a cross correlation function with the other signals of the set that decays faster with time than reflections of the seismic signals from the survey area. One such set of signals includes a linear FM sweep phase-modulated by a maximal-length sequence code shifted a different number of chips for each signal. | 10-08-2009 |
20090296525 | NOISE SUPPRESSION FOR DETECTION AND LOCATION OF MICROSEISMIC EVENTS USING A MATCHED FILTER - A method for determining presence of seismic events in seismic signals includes determining presence of at least one seismic event in seismic signals corresponding to each of a plurality of seismic sensors. A correlation window is selected for each of the plurality of seismic signals. Each correlation window has a selected time interval including an arrival time of the at least one seismic event in each seismic signal. Each window is correlated to the respective seismic signal between a first selected time and a second selected time. Presence of at least one other seismic event in the seismic signals from a result of the correlating. | 12-03-2009 |
20090323472 | SEISMIC SURVEY METHOD - A method of performing a 3-D seismic survey operation using (i) a plurality of vibroseis sources, and (ii) an array of seismic sensors arranged within a survey area wherein each vibroseis source emits a distinctive acoustic signal and each seismic sensor of the array is in a continuous state of readiness to detect reflected acoustic signals, the method comprising: (a) assigning vibroseis points (VPs) to each of the vibroseis sources; (b) independently moving each vibroseis source to assigned vibroseis point (VPs) where the vibroseis source emits its distinctive acoustic signal independently in time of the emission of the distinctive acoustic signals of the other vibroseis sources at their assigned vibroseis points (VPs); (c) recording the emission time of the distinctive acoustic signal by each vibroseis source at its assigned VPs together with the geographic position of the assigned VPs; (d) continuously listening for reflected acoustic signals using the array of seismic sensors and recording a time domain record of the reflected acoustic signals received by each seismic sensor of the array; wherein the reflected acoustic signals associated with the emission of a distinctive acoustic signal by a vibroseis source at an assigned VP are determined by: (i) extracting the reflected acoustic signals from the time domain records for the seismic sensors of the array during a predetermined listening time associated with the emission of the distinctive acoustic signal by the vibroseis source at the assigned VP; (ii) cross-correlating the extracted reflected acoustic signals with the distinctive emitted acoustic signal for the vibroseis source at the assigned VP thereby eliminating weakly correlated signals; and (iii) attenuating randomised cross-contamination in the cross-correlated extracted reflected acoustic signals from step (ii) using random noise attenuation techniques. | 12-31-2009 |
20100085836 | DITHERED SLIP SWEEP VIBROSEIS ACQUISITION SYSTEM AND TECHNIQUE - A technique includes generating vibroseis sweeps for a vibroseis survey to produce seismic data acquired in response to seismic signals produced by the sweeps. The generation of the vibroseis sweeps including temporally arranging the sweeps into time-overlapping groups. The technique includes regulating a timing of the groups relative to each other based on a slip time. The technique also includes regulating a timing of the sweeps of each group such that consecutive sweep firings of each group are spaced apart by a time substantially less than the slip time. | 04-08-2010 |
20100103773 | Simultaneous Multiple Source Extended Inversion - Methods for improving the range and resolution of simultaneous multiple vibratory source seismic system including ZENSEIS™ are provided. | 04-29-2010 |
20100157733 | COMPENSATING SEISMIC DATA FOR SOURCE VARIATIONS - A technique includes modeling a fundamental component of a vibroseis sweep that is injected into the earth based on a ground force measurement and a reference sweep. The technique includes determining an operator to compensate seismic data acquired in response to the injected vibroseis sweep based at least in part on the reference sweep and the fundamental component, and the technique includes applying the operator to the seismic data. | 06-24-2010 |
20100157734 | Generating Seismic Vibrator Signals Having Distinguishing Signatures - A method and apparatus for generating a seismic source signal are provided for generating energy in the form of a plurality of time sequence vibratory signals, the vibratory signals being partitioned as a function of time and/or frequency, wherein each of the plurality of signals comprises a distinguishing signature. The partitioned vibratory signals are emitted into a terrain of interest as seismic source signals for conducting a seismic survey. | 06-24-2010 |
20110080807 | METHOD FOR COLLISION RISK MITIGATION USING INTELLIGENT NON-INVASIVE ULTRASONIC SENSORS FOR DIRECTIONAL DRILLING - A method of directional drilling which comprises an intelligent non-invasive ultrasonic sensors that can detect the approaching of an existing well and then can stop and redirect the directional drilling to prevent collisions with preexisting wells. | 04-07-2011 |
20110228638 | SYSTEM AND METHOD OF 3D SALT FLANK VSP IMAGING WITH TRANSMITTED WAVES - According to a preferred aspect of the instant invention, there is provided herein a system and method for imaging complex subsurface geologic structures such as salt dome flanks using VSP data. In the preferred arrangement, a receiver wave field will be downward continued through a salt flood model and a source wave field will be upward continued through a sediment flood model until they “meet” at the subsurface locations of the VSP receivers. The source and receiver wave fields will be cross correlated as an imaging condition at each depth interval. | 09-22-2011 |
20120039150 | UNIQUE SEISMIC SOURCE ENCODING - The invention relates to the acquisition of seismic data using many seismic sources simultaneously or where the sources are emitting in an overlapping time frame but where it is desired to separate the data traces into source separated data traces. The key is having each seismic source emit a distinctive pattern of seismic energy that may all be discerned in the shot records of all of the seismic receivers. Distinctive patterns are preferably based on time/frequency pattern that is distinctive like an easily recognized song, but may include other subtle, but recognizable features such a phase differences, ancillary noise emissions, and physical properties of the vibes such a the weight and shape of the pad and the reaction mass and the performance of the hydraulic system and prime energy source. | 02-16-2012 |
20120063264 | Method for the Emplacement of a Sensor in Soil for Sensing Seismic Activity - A method for the emplacement of a sensor in soil for sensing seismic activity comprising in one embodiment the steps of creating a borepath in the soil, the borepath having opposing ends and a diameter, inserting a longitudinal housing and a grout pipe into the borepath extending from one of said opposing ends to the other, the longitudinal housing having the sensor encapsulated within, the grout pipe having one end and a grouting end, pulling the grout pipe longitudinally within the borepath by the one end to position the grouting end between the opposing ends within the borepath, and conducting a grout through the grout pipe into the borepath at the grouting end to encase the longitudinal housing within the borepath thereby facilitating emplacement of a sensor in soil for sensing seismic activity. The grout preferably selected so to acoustically match the longitudinal housing to the soil. | 03-15-2012 |
20120075955 | EFFICIENT SEISMIC SOURCE OPERATION IN CONNECTION WITH A SEISMIC SURVEY - An embodiment includes determining whether first and second seismic sources are ready to perform seismic sweeps. When either of the first and the second seismic sources are determined to be unready to perform seismic sweeps, the method includes (a) determining a predicted time delay that will transpire before the first and the second seismic sources will both be ready to perform seismic sweeps; (b) determining a predicted distance that will exist between the first and second seismic sources once the first and second sources are both ready to perform seismic sweeps; (c) determining the predicted time delay meets a time threshold and the predicted distance meets the distance threshold, and then (d) initiating simultaneous seismic sweeping with the first and second seismic sources after the first and the second seismic sources are both ready to perform seismic sweeps | 03-29-2012 |
20120287755 | SEISMIC TRUE ESTIMATED WAVELET - The invention relates to processing seismic data that includes signals from at least two sources and typically three or four sources where source separation is necessary for geophysical analysis. Specifically, the present invention is a process for correcting data prior to inversion where the correction is provided to correct for the filtering effect of the earth. The earth is a non-homogenous seismic propagator that causes distortions of wavelets of seismic energy related to the source and receiver azimuth and offset that makes the identification of source specific data within the composite data harder to identify. Computing an earth response and correcting for the effects of the earth on the wavelets provides for more resolution and more clarity in the resulting data and better geophysical interpretation. | 11-15-2012 |
20130163380 | LOW-FREQUENCY CONTENT BOOST FOR VIBRATORY SEISMIC SOURCE AND METHOD - Computer software, computer and method for generating with a computing device a desired pilot signal for driving a vibratory source to generate seismic waves. The method includes steps for compressing a pilot signal in a force domain and also compressing a mass displacement in a displacement domain. The resulting desired pilot signal boosts the low-frequency end of the vibratory source. | 06-27-2013 |
20130163381 | METHOD AND SEISMIC SOURCES WITH HIGH PRODUCTIVITY - A method for seismic prospecting that includes a step of deploying plural vibratory sources on the ground; a step of receiving at each vibratory source a corresponding pilot signal for driving the vibratory source; a step of asynchronously actuating the vibratory sources to generate seismic waves into the ground; and a step of continuously recording seismic signals produced by the seismic waves. Pilot signals for the plural vibratory sources are obtained by spectrally shaping starting sequences into continuous pseudorandom sequences that are weakly correlated over a predetermined time interval. | 06-27-2013 |
20140153364 | Seismic Geophysical Surveying - The present invention relates to an apparatus for use in geophysical surveying. Geophysical surveying typically involves stimulating an area of interest with a seismic source and detecting the response in a sensor array. The application describes a fibre optic distributed sensing apparatus having a source ( | 06-05-2014 |
20160154131 | VIBRO SEISMIC SOURCE SEPARATION AND ACQUISITION | 06-02-2016 |
20160170049 | SYSTEMS AND METHODS FOR REDUCING NOISE IN A SEISMIC VIBRATORY SOURCE | 06-16-2016 |