Patent application number | Description | Published |
20100039891 | Attenuating seismic interference noise using a dual sensor recording system - A method for attenuating noise in marine seismic signals includes cross ghosting pressure responsive marine seismic signals and contemporaneously acquired motion responsive marine seismic signals. A difference is determined between the cross ghosted signals. The difference is used to attenuate noise in at least one of the pressure responsive signals and the motion responsive signals. | 02-18-2010 |
20100054080 | Determining Seismic Streamer Array Geometry And Seismic Sensor Response Using Dual Sensor Seismic Streamer Arrays - A method for marine seismic surveying includes determining at least an initial depth of a plurality of spaced apart seismic sensors in a body of water. The sensors each include a substantially collocated pressure responsive sensor and motion responsive sensor. A ghost time delay is determined for each sensor based on the at least an initial depth. Seismic signals detected by each motion responsive sensor and each pressure responsive sensor are cross ghosted. The at least initial depth is adjusted, and the determining ghost time delay and cross ghosted seismic signals are repeated until a difference between the cross ghosted motion responsive signal and the cross ghosted pressure responsive signal falls below a selected threshold. | 03-04-2010 |
20100097886 | Method for determining formation quality factor from dual-sensor marine seismic signals - A method for estimating formation quality factor includes determining an upgoing pressure wavefield of seismic signals recorded using a collocated pressure responsive sensor and motion responsive sensor deployed in a body of water The upgoing wavefield has spectral effect of water surface ghosting attenuated by combining the pressure responsive signals and motion responsive signals. The quality factor is determined by determining a difference in amplitude spectra between a first seismic event and a second seismic event in the upgoing pressure wavefield. | 04-22-2010 |
20100135113 | Method for determining signal quality in dual sensor seismic streamer signals - A method for determining quality of signals acquired using marine seismic streamers having pressure responsive sensors and motion responsive sensors includes cross ghosting pressure responsive seismic signals and contemporaneously acquired motion responsive seismic signals. First filters are determined that cause the cross ghosted pressure responsive signals to substantially match the cross ghosted motion responsive signals. Second filters are determined that cause the cross ghosted motion responsive signals to substantially match the cross ghosted pressure responsive signals. The first and second filters are convolved and the convolution is used to determine signal quality. | 06-03-2010 |
20120069704 | METHODS AND APPARATUS FOR DETERMINING SEISMIC STREAMER ARRAY GEOMETRY AND SEISMIC SENSOR RESPONSE - A method for marine seismic surveying includes determining at least an initial depth of a plurality of spaced apart seismic sensors in a body of water. The sensors each include a substantially collocated pressure responsive sensor and motion responsive sensor. A ghost time delay is determined for each sensor based on the at least an initial depth. Seismic signals detected by each motion responsive sensor and each pressure responsive sensor are cross ghosted. The at least initial depth is adjusted, and the determining ghost time delay and cross ghosted seismic signals are repeated until a difference between the cross ghosted motion responsive signal and the cross ghosted pressure responsive signal falls below a selected threshold. Other embodiments, aspects and features are also disclosed. | 03-22-2012 |
20120257474 | Method for seismic surveying using wider lateral spacing between sources to improve efficiency - A method for towing a marine seismic acquisition array in a body of water includes towing a plurality of laterally spaced apart sensor streamers behind a survey vessel in the water. A lateral spacing between adjacent streamers is represented by L. At least two laterally spaced apart seismic energy sources are towed behind the survey vessel. A lateral spacing between the at least two sources is represented by kL, wherein k is a constant and wherein k is at most equal to the number of streamers. | 10-11-2012 |
20140140169 | STEERABLE TOWED SIGNAL SOURCE - Techniques are disclosed relating to steering a signal source towed behind a survey vessel. In one embodiment, a method includes towing a signal source and a streamer in a body of water. The signal source includes a steering mechanism. The method further includes determining a current heading of the streamer and, based on the determined heading, using the steering mechanism to adjust a heading of the signal source. In some embodiments, the method also includes determining a current heading of the signal source based on location information received from one or more location buoys coupled to the signal source, and, based on the determined heading of the signal source, using the steering mechanism to adjust the heading of the signal source. In one embodiment, the steering mechanism is used to align the heading of the signal source with the heading of the streamer. | 05-22-2014 |
20160054466 | METHODS AND APPARATUS FOR DETERMINING SEISMIC STREAMER ARRAY GEOMETRY AND SEISMIC SENSOR RESPONSE - A method for marine seismic surveying includes determining at least an initial depth of a plurality of spaced apart seismic sensors on streamers towed in a body of water. The sensors each include a substantially collocated pressure responsive sensor and motion responsive sensor. A ghost time delay is determined for each sensor based on the at least an initial depth. Seismic signals detected by each motion responsive sensor and each pressure responsive sensor are cross ghosted. The at least initial depth is adjusted, and the determining ghost time delay and cross ghosted seismic signals are repeated until a difference between the cross ghosted motion responsive signal and the cross ghosted pressure responsive signal falls below a selected threshold. Other embodiments, aspects and features are also disclosed. | 02-25-2016 |