Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1988-02-11
1988-12-27
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
364422, G01V 140
Patent
active
047945737
ABSTRACT:
A process for separating upgoing and downgoing seismic wave events in a vertical seismic profile, and particularly for vertical seismic profiles wherein the seismic energy source is offset from the borehole in which seismic detectors are located in vertical spaced array. The process operates on two detector signals at a time (as S.sub.1 and S.sub.2) and is based on the concept that waves traveling in opposite directions have spatial derivatives of opposite sign. The derivative is approximated by the difference of the two signals which is time integrated to recover the phase. The resulting integrated difference signal I is then amplitude scale corrected and combined by addition or substraction with a signal S.sub.0 representing the sum of the two detector signals to form a succession of filtered signals which, when recorded in alignment in order of detector depths to form a vertical seismic profile preserves either the upgoing or the downgoing seismic events.
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J. J. Raoult, B. Joncheray, and D. Carron, "The Check VSP: A New Vertical Seismic Data Acquisition and Processing Technique", 1984, Expanded Abstracts of S.E.G. Convention.
Bell David W.
Cox Vernon D.
Carlson Ronald J.
Conoco Inc.
Kowalski Frank J.
Lobo Ian J.
Schupbach Cortlan R.
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