Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1998-07-22
2000-04-11
Oda, Christine K.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 46, 367 62, G01V 138
Patent
active
060495073
ABSTRACT:
An apparatus and method for removing the distortion in marine seismic data resulting from the motion of the ship. The ship trails one or more seismic sources and receivers and moves forward at a known velocity. The seismic sources emit seismic waves that travel through the water and reflect off interfaces between rock formations below the ocean floor. The motion of the sources and receivers introduces distortion in the recorded seismic data that can be modeled using Doppler theory. The data preferably is corrected for source motion independently from the correction for receiver motion. The seismic data is first corrected for receiver motion and then for source motion. The technique for correcting for source motion includes correlating the receiver-corrected data with a reference sweep signal, performing an F-K transform, performing an inverse F-K transform on a selected subset of the F-K transformed data, and computing appropriate correction filters for the data resulting from the inverse F-K transform. This process is repeated for all subsets of F-K transformed data and the resulting filtered data are summed together.
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The effects of source and receiver motion on seismic data, Gary Hampson and Helmut Jakubowicz, Geophysical Prospecting, vol. 43, 1995, pp. 221-244.
Jolly Anthony
Keen Malcolm D.
Mobil Oil Corporation
Oda Christine K.
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