| Patent application number | Description | Published |
|---|
| 20090243614 | SIGNAL GENERATOR FOR ELECTROMAGNETIC SURVEYING THAT PRODUCES A SIGNAL HAVING AN ANALOG CONTINUOUS WAVEFORM - To perform an electromagnetic (EM) surveying of a subterranean structure, a signal generator produces a signal having an analog continuous waveform without steps in the waveform. An antenna is responsive to the signal having the analog continuous waveform to emit an EM field to produce the EM surveying of the subterranean structure. | 10-01-2009 |
| 20090268552 | Methods of Range Selection for Positioning Marine Seismic Equipment - A method for selecting a signal arrival for determining an accurate position of seismic equipment includes the steps of transmitting a signal from a pinger; predicting a direct arrival and a reflected arrival of the signal at a receiver, wherein each arrival is the time between the transmission of the signal to reception of the signal; measuring arrivals of the signal at the receiver; selecting the measured signal arrival that is similar to the predicted direct arrival as a preliminary signal arrival; defining a confidence interval for the actual direct arrival of the signal based on the predicted direct arrival and the predicted reflected arrival; and finalizing the signal arrival, wherein the selected preliminary signal arrival is the finalized signal arrival if it is within the confidence interval. | 10-29-2009 |
| 20100013485 | SURVEYING USING VERTICAL ELECTROMAGNETIC SOURCES THAT ARE TOWED ALONG WITH SURVEY RECEIVERS - A system to perform a marine subterranean survey includes at least one vertical electromagnetic (EM) source and at least one EM receiver to measure a response of a subterranean structure that is responsive to EM signals produced by the vertical EM source. At least one tow cable is used to tow the EM source and EM receiver through a body of water. | 01-21-2010 |
| 20100103770 | Rotational Motion Compensated Seabed Seismic Sensors and Methods of use in Seabed Seismic Data Acquisition - Apparatus and methods for acquiring seismic data using a seabed seismic data cable positioned on a seabed are described, including correcting for the effect of one or more sensor non-linear motions, which improves accuracy of seismic data. One or multiple non-linear movements of the sensor may be corrected for. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b). | 04-29-2010 |
| Patent application number | Description | Published |
|---|
| 20090295394 | SENSOR CABLE FOR ELECTROMAGNETIC SURVEYING - A sensor cable for surveying. The sensor cable may comprise at least one pair of current sensor electrodes and an amplifier. The current sensor electrodes may be disposed along opposite sides of the sensor cable. The current sensor electrodes may be configured to detect current in an electromagnetic field transverse to an inline direction of the sensor cable. The amplifier may be configured to amplify the current in the electromagnetic field for detection by the electrode pair. | 12-03-2009 |
| 20100001733 | SENSOR CABLE FOR ELECTROMAGNETIC SURVEYING - A sensor cable for surveying. The sensor cable has a housing, which includes one of more electrodes and a conductive gel surrounding the one or more electrodes. The conductive gel is configured to conduct electrical current to the one or more electrodes and keep the one or more electrodes moist. The housing may also have a membrane surrounding the conductive gel, wherein the membrane is configured to hold the conductive gel in contact with the one or more electrodes and permit electric current to flow between a surrounding medium and the conductive gel. | 01-07-2010 |
| 20100001735 | SURVEYING A SUBTERRANEAN STRUCTURE USING ELECTROMAGNETIC MEASUREMENTS AND MICROORGANISM CONTENT DATA - A survey apparatus for surveying a subterranean structure includes an electromagnetic (EM) sensing element to measure an EM field received from the subterranean structure, and a sample collector activatable to collect a sample of soil. | 01-07-2010 |
| 20100019929 | COMMUNICATION SYSTEM FOR SURVEY SOURCE AND RECEIVER - A method for communicating with a receiver during an electromagnetic survey. In one implementation, the method may include sending a survey signal to a subsurface region, wherein the survey signals is a first electromagnetic signal and sending a diagnostic signal to the receiver. The diagnostic signal is a second electromagnetic signal having a diagnostic message. | 01-28-2010 |
| 20100039890 | SEISMIC DATA ACQUISITION ASSEMBLY - A seismic data acquisition assembly includes a cable; seismic sensors that are disposed along the cable; and a filler material inside the cable. The filler includes a hydrocarbon-based liquid and an agent to cause the filler material to have a rheological property that is substantially different than a corresponding rheological property of the hydrocarbon-based liquid. | 02-18-2010 |
| 20120146649 | Electromagnetic Measurements Using a Sensor Cable Having Improved Characteristics - To survey a subterranean structure, for acquiring an electromagnetic (EM) measurement signal across EM receivers having a target axial spacing, a group of more than two EM receivers in an interval defined by the target axial spacing along a sensor cable is provided. The spacing between successive ones of at least some EM receivers in the group is less than the target axial spacing. EM measurements are acquired using the EM receivers in the group. | 06-14-2012 |
| 20120146650 | Providing an Electromagnetic Source Array Having a Plurality of Electrodes - To perform surveying of a subterranean structure, an electromagnetic (EM) source array has a plurality of electrodes. Different subsets of the electrodes are dynamically activated to provide corresponding EM radiation patterns to survey the subterranean structure. | 06-14-2012 |
| 20120194196 | Electromagnetic Source to Produce Multiple Electromagnetic Components - An electromagnetic (EM) source assembly for performing marine subterranean surveying includes electrodes in an arrangement configured for towing through a body of water. A controller is configured to selectively activate different sets of the plurality of electrodes, where a first of the sets produces an EM field in a first direction, and where a second of the sets produces an EM field in a second, different direction. | 08-02-2012 |
| 20130121108 | ROTATIONAL MOTION COMPENSATED SEISMIC SENSORS AND METHODS OF USE IN SEISMIC DATA ACQUISITION - Apparatus and methods for acquiring seismic data using a seabed seismic data cable positioned on a seabed are described, including correcting for the effect of one or more sensor non-linear motions, which improves accuracy of seismic data. One or multiple non-linear movements of the sensor may be corrected for. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. | 05-16-2013 |
| 20140058677 | METHOD FOR PROCESSING ELECTROMAGNETIC DATA - Methods and computing systems for processing electromagnetic data are disclosed. In one embodiment, a method is disclosed that includes performing a first controlled source electromagnetic survey at a selected area that includes a reservoir zone; performing additional controlled source electromagnetic surveys at the selected area after the first survey; and inverting measurements from the first survey and the additional surveys to identify at least one resistivity change in the reservoir zone after the first survey, wherein during the inversion, respective measured resistivity values from the first survey and respective measured resistivity values from the additional surveys are constrained to be constant, and correspond to one or more areas disposed in the selected area that are outside of the reservoir zone. | 02-27-2014 |
