Process for separating waves in borehole seismics for walkway-ty

Details Process for separating waves in borehole seismics for walkway-ty Process for separating waves in borehole seismics for walkway-ty

1998-10-07

2000-02-22

Oda, Christine K.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 63, 367 75, G01V 136

Patent

active

060288213

ABSTRACT:
A process for separating waves in borehole seismics for walkaway-type acquisitions. Waves are generated in a medium from several positions of a source. The waves are received at at least three sensors along axes V, H.sub.1, H.sub.2. Collections of C traces are formed with a common source. On the basis of the trace collection, collections of residual C traces and C signals, a pivot trace is selected from the collection of residual C traces. A straight line of variable slope p is plotted at each sampled point of the pivot trace. The amplitudes of the seismic events located at the intersections of the traces with the straight line are summed along the straight line. The amplitude sums are then transferred to a domain (.tau., p). A synthetic seismogram is made from the domain (.tau., p) and iterations are performed until the synthetic seismogram is acceptable in terms of the data of the collection of residual C traces.

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C. Esmersoy, "Inversion of P and SV Waves From Multicomponent Offset Vertical Seismic Profiles", Geophysics, vol. 55, No. 1, Jan. 1990, pp. 39-50.
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R. Daures et al, "Applying Three-Componet Records in Wave Field Separation", Geophysical Transactions, Hungary, Jul. 1987, vol. 33, No. 1.

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