Joe E Sanders

US Patent:

51630281, Nov 10, 1992

Filed:

Sep 27, 1991

Appl. No.:

7/767248

Inventors:

Frederick J. Barr - Houston TX
Joe I. Sanders - Sugar Land TX

Assignee:

Halliburton Geophysical Services, Inc. - Sugar Land TX

International Classification:

G01V 128
G01V 138

US Classification:

367 13

Abstract:

In dual-sensor, bottom-cable marine seismic exploration where hydrophone/geophone pairs are deployed on the marine bottom, coupling imperfections between the geophones and the marine bottom contribute to differences between the impulse response of the geophones and the impulse response of the hydrophones. To correct for the coupling imperfection, a filter is designed which compensates for the inherent impulse response differences as well as response differences caused by the imperfect coupling. Preferably, the filter is designed using a calibration procedure prior to production shooting. First, the response of a hydrophone and geophone to a calibration wave is recorded. The calibration wave has a magnitude that is similar to the magnitude of a reflected wave that hydrophone and geophone would detect during normal production shooting. These recorded responses are transformed into the frequency domain. Once transformed, the response of the hydrophone is divided by the response of the geophone to produce a filtering function.

US Patent:

52355543, Aug 10, 1993

Filed:

Mar 10, 1992

Appl. No.:

7/849998

Inventors:

Frederick J. Barr - Houston TX
Joe I. Sanders - Sugar Land TX

Assignee:

Halliburton Geophysical Services, Inc. - Sugar Land TX

International Classification:

G01V 128
G01V 138

US Classification:

367 13

Abstract:

In dual-sensor, bottom-cable marine seismic exploration where hydrophone/geophone pairs are deployed on the marine bottom, coupling imperfections between the geophones and the marine bottom contribute to differences between the impulse response of the geophones and the impulse response of the hydrophones. To correct for the coupling imperfection, a filter is designed which compensates for the inherent impulse response differences as well as response differences caused by the imperfect coupling. Preferably, the filter is designed using a calibration procedure prior to production shooting. First, the response of a hydrophone and geophone to a seismic wave is recorded. Then, these recorded responses are transformed into the frequency domain. Once transformed, the response of the hydrophone is divided by the response of the geophone to produce a filtering function. When the filtering function is applied to geophone signals during production shooting, the filter compensates the geophone signals to alleviate differences in response characteristics between the geophone signals and the hydrophone signals.

US Patent:

57744165, Jun 30, 1998

Filed:

Apr 7, 1995

Appl. No.:

8/418507

Inventors:

Selwa Sadek - Houston TX
Jack Kinkead - Cypress TX
Bill Cafarelli - Houston TX
Joe Sanders - Sugar Land TX

Assignee:

PGS, Tensor, Inc.

International Classification:

G01V 138

US Classification:

367 24

Abstract:

In ocean bottom seismic exploration, it is common for co-located hydrophones and geophones to be deployed on the ocean bottom. One problem encountered is the water column reverberation. An improved method and device is proposed for attenuating water column reverberations using co-located hydrophones and geophones in ocean bottom seismic processing. In this method, each recorded hydrophone and geophone signal, or trace, is decomposed into a series of narrow band-pass filtered traces. For each of the filtered traces, a measurement of the energy level is made upon which normalization factors are computed and applied. The resulting filtered, normalized traces are summed. Optionally, prior to application, the normalization factors can be organized by common shot, common group, common offset, and surface consistent normalization factors derived and applied for each pass-band.