Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1993-08-20
1995-04-18
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 21, 367 37, 367 38, 181101, 181112, G01V 138
Patent
active
054084415
ABSTRACT:
A method for obtaining seismic data in frigid regions without interference from flexural ice waves. In an exemplary embodiment, seismic data is produced by using an energy source to generate a seismic wave in a floating ice sheet. Seismic disturbances caused by the energy source are detected by one or more hydrophones and geophones, which produce hydrophone and geophone response signals, respectively. In a first embodiment, the hydrophone response signal is integrated. The integrated signal and/or the geophone response signal are scaled, and the two signals are then added. Alternatively, instead of integrating the hydrophone response signal, the geophone response signal may be differentiated prior to scaling and summing. A method is also disclosed for overcoming phase errors that might be introduced, for example, by the use of a transformer-coupled hydrophone. In another embodiment of the invention, a linear adaptive filter is applied to the hydrophone and geophone response signals to obtain an output signal having attenuated noise characteristics.
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Barr Frederick J.
Nyland David L.
Sitton Gary A.
Eldred J. Woodrow
Halliburton Company
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