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

1985-07-02

Cangialosi, Sal

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 34, 367 43, G01V 128

Patent

active

045272603

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.1 . . . s.sub.n detected at respective levels x.sub.1 . . . x.sub.n, in determining the propagation time t.sub.k of the acoustic waves from the level x.sub.1 to each level x.sub.k, in both advancing and delaying the signals s.sub.k by the time t.sub.k in relation to s.sub.1, in adjusting the signals for the effects of the acoustic impedance of the formation, in combining s.sub.1 and the signals s.sub.k thus shifted and adjusted to obtain a sum z.sub.1 ', in calculating a sum y.sub.1 ' of s.sub.1 and of the thus delayed and adjusted signals s.sub.k, and in generating a signal u.sub.1.sup.* ', defined as an optimum estimation of the upgoing wave component, from the sums y.sub.1 ' and z.sub.1 '.

REFERENCES:
patent: 3339176 (1967-08-01), Sparks
patent: 3371310 (1968-02-01), Silverman
patent: 4314364 (1982-02-01), Bickel
patent: 4397004 (1983-08-01), Bronislaw
Balch et al., "The Use of Vertical Seismic Profiles in Seismic Investigations of the Earth", Tech Paper, Presented at the 33rd Annual Midwestern Meeting of S.E.G., Mar. 23-25, 1980, Tulsa.

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