Method for seismic exploration by vertical seismic profiling and

Details Method for seismic exploration by vertical seismic profiling and Method for seismic exploration by vertical seismic profiling and

1981-11-12

1983-08-02

Wilbur, Maynard R.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 34, 367 43, 367 59, G01V 128

Patent

active

043970044

ABSTRACT:
A seismic exploration method is disclosed for filtering the signals produced by a detector placed at different depths in a well in response to an emission of acoustic waves from a source on the surface: the signals comprising downgoing wave components and upgoing wave components.
The filtering consists in sampling from among the N signals to be processed a group of n signals s.sub.l . . . s.sub.n detected at respective levels x.sub.l . . . x.sub.n, in determining the propagation time t.sub.k of the acoustic waves from the level x.sub.l to each level x.sub.k, in advancing the signals s.sub.k by the time t.sub.k in relation to s.sub.l and in adding s.sub.l and the signals s.sub.k thus shifted to obtain a sum z.sub.l, in calculating a sum y.sub.l of s.sub.l and of the signals s.sub.k delayed by the time t.sub.k in relation to s.sub.l, in generating a signal u.sub.l *, defined as an optimum estimation of the upgoing wave component, from the sums y.sub.l and z.sub.l, and in repeating these operations until the signal U.sub.N *.sub.-n+1 is obtained.

REFERENCES:
patent: 3339176 (1967-08-01), Sparks
patent: 3371310 (1968-02-01), Silverman
patent: 4314364 (1982-02-01), Bickel
"The Use of Vertical Seismic Profiles in Seismic Investigations of the Earth", A. H. Balch et al., Geophysics, vol. 47, No. 6, Jun. 1982 pp. 906-918.

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