G - Physics – 01 – V
Patent
G - Physics
01
V
349/15
G01V 1/30 (2006.01) G01V 1/28 (2006.01) G01V 1/36 (2006.01)
Patent
CA 1227557
ABSTRACT OF THE DISCLOSURE "ROBUST ESTIMATOR AND METHOD FOR DETERMINING, FOR EXAMPLE, IF SIGN-BIT REPRESENTATIONS OF FULL-WAVEFORM SEISMIC TRACES CAN BE USED IN SUBSEQUENT PROCESSING OF THE DATA, SAY IN EDITING SEISMIC TRACES COLLECTED BY LARGE MULTICHANNEL SEISMIC SYSTEMS" A method is disclosed for determining if sign- clipped variations of full-waveform traces can be used in subsequent cross-correlation processing without undue hard- ship. In accordance with one aspect, the present invention examines skewness of the amplitude spectrum of the full wave- form. If the former significantly differs from conventional Gaussian distribution over the frequency range of interest, i.e., the amplitude spectrum is non-Gaussian, sign-clipped versions thereof can be used in subsequent cross-correlation processing without undue loss in processing accuracy. In another aspect, the present invention is used to edit a series of traces, one at a time, gathered by a large multi- channel collection system. In this aspect, the different spectral noise estimates, including cross-correlation estimates generated from sign-clipped versions of the full- wave form traces, are advantageously used.
444900
Ergas Raymond A.
Muir Francis
Chevron Research And Technology Company
Sim & Mcburney
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