Patent application number | Description | Published |
20090072831 | Source Monitoring for Electromagnetic Surveying - Method for real time monitoring of the waveform transmitted by an electromagnetic survey source, using a near-source monitoring receiver to measure electromagnetic field and transmitting the measured signal in real time to a control location. | 03-19-2009 |
20090096457 | Method for determining earth vertical electrical anisotropy in marine electromagnetic surveys - A method is disclosed for determining earth vertical electrical anisotropy from offshore electromagnetic survey measurements. The method requires both online and offline data, which includes at least one electromagnetic field component sensitive at least predominantly to vertical resistivity and another component sensitive at least predominantly to horizontal resistivity. Using a horizontal electric dipole source, online E | 04-16-2009 |
20090126939 | Electromagnetic Data Processing System - Method and computer program for accepting controlled-source electromagnetic (“CSEM”) source and receiver data ( | 05-21-2009 |
20090171587 | Method for Determining Receiver Orientations - Method for completely specifying orientation of electromagnetic receivers dropped to the ocean bottom in an electromagnetic survey. Survey data are selected, rejecting noisy data with long offsets and data where the receiver has saturated with short offsets ( | 07-02-2009 |
20090204327 | Method For Determining Physical Properties of Structures - Method for efficient inversion of controlled-source electromagnetic survey data to obtain a resistivity model of the subsurface of the survey area. The method extracts the dimensions and location of sub-surface structures as they may be revealed by existing seismic or other available high resolution survey data from the subsurface area ( | 08-13-2009 |
20090243613 | Method and Apparatus for Utilizing Time Division Multiple Waveform Transmitting - A method and apparatus of constructing a signal for a controlled source electromagnetic survey is described. In one embodiment, a method is described that includes determining a first waveform and a second waveform, the first waveform and second waveform related to a combined frequency spectrum and bandwidth associated with a geophysical survey line. Then, a signal is constructed by sequencing the first waveform with the second waveform. This signal may be utilized in a transmitter, which may be pulled by a vessel along the geophysical survey line. | 10-01-2009 |
20090276189 | Estimating Noise at One Frequency by Sampling Noise at Other Frequencies - A method, apparatus and computer program for improving the signal-to-noise ratio of a signal S(t), S(t) containing Signal and noise, are disclosed. A measurement of S(t) at a frequency-of-interest is obtained. Noise measurements of S(t) at one or more noise frequencies where the Signal portion of S(t) is expected to be small are obtained. The noise at the frequency-of-interest is estimated using the noise measurements at the one or more noise frequencies. The estimated noise is subtracted from the measurement of S(t) at the frequency-of-interest. | 11-05-2009 |
20100018719 | Inversion of CSEM Data With Measurement System Signature Suppression - A method for suppressing measurement system signature, or artifacts, that arise when controlled source electromagnetic survey data are inverted to obtain a resistivity image of a subsurface region. The method involves identifying regions ( | 01-28-2010 |
20100326669 | METHOD FOR GENERATING ANISOTROPIC RESISTIVITY VOLUMES FROM SEISMIC AND LOG DATA USING A ROCK PHYSICS MODEL - A hydrocarbon exploration method is disclosed for generating anisotropic resistivity models of a subsurface reservoir from seismic and well data using a rock physics model. In one embodiment, the method comprises: selecting wells within a region of interest ( | 12-30-2010 |
20110295507 | Method and Apparatus For Utilizing Time Division Multiple Waveform Transmitting - A method and apparatus of constructing a signal for a controlled source electromagnetic survey is described. In one embodiment, a method is described that includes determining a first waveform and a second waveform, the first waveform and second waveform related to a combined frequency spectrum and bandwidth associated with a geophysical survey line. Then, a signal is constructed by sequencing the first waveform with the second waveform. This signal may be utilized in a transmitter, which may be pulled by a vessel along the geophysical survey line. | 12-01-2011 |