| Patent application number | Description | Published |
|---|
| 20090005997 | Method for Spatial Filtering of Electromagnetic Survey Data - The method for suppressing noise in the controlled seismic source electromagnetic survey data based on the frequency content of the noise ( | 01-01-2009 |
| 20090067546 | Method for Compensating Electromagnetic Data - Method for compensating for phase errors in electromagnetic data by exploiting the frequency scaling properties of electromagnetic fields. The data are obtained at various source-receiver offsets. Then, temporal frequency components of the data at each offset R are determined. Next, the phase spectrum (phase vs. offset) for each of the frequency components is determined. Then, the phase spectra for the different frequencies f are displayed vs. scaled offset R√ω, where ω=2πf. Finally, the phase spectra are then adjusted such that the differences in phases for the different frequencies are reduced. The adjustment process can be repeated until phase differences are reduced to an acceptable level. | 03-12-2009 |
| 20090120636 | Method for performing controlled source electomagnetic surveying with multiple transmitters - Method for separating responses of multiple transmitters m a controlled source electromagnetic survey by using mutually orthogonal transmitter waveforms and transforming the combined response to the frequency domain ( | 05-14-2009 |
| 20090126939 | Electromagnetic Data Processing System - Method and computer program for accepting controlled-source electromagnetic (“CSEM”) source and receiver data ( | 05-21-2009 |
| 20090133870 | Method for Phase and Amplitude Correction in Controlled Source Electromagnetic Survey Data - The method for correcting the phase of measured electric signals or magnetic signals of field data from a controlled source electromagnetic survey (CSES) by comparing the measured field data corresponding to a selected frequency to the simulated data for various signal source receiver offsets ( | 05-28-2009 |
| 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 |
| 20090306900 | Rapid Inversion of Electromagnetic Reconnaisance Survey Data - Method for rapid inversion of data from a controlled-source electromagnetic survey of a subterranean region. Selected ( | 12-10-2009 |
| 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 |
| 20100176791 | Method For Correcting The Phase of Electromagnetic Data - Method for identifying, determining and correcting source-related phase errors in data from a controlled source electromagnetic survey by using data from ordinary survey receivers, i.e. without benefit of source monitoring data. Abrupt anomalies indicating source malfunctions are identified ( | 07-15-2010 |
| 20110166840 | Systems and Methods For Subsurface Electromagnetic Mapping - Systems and methods which provide electromagnetic subsurface mapping to derive information with respect to subsurface features whose sizes are near to or below the resolution of electromagnetic data characterizing the subsurface are shown. Embodiments operate to identify a region of interest ( | 07-07-2011 |
