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G01V 1/40 (2006.01) G01V 1/24 (2006.01) G01V 1/28 (2006.01)
Patent
CA 1167557
21,611 ABSTRACT OF THE DISCLOSURE 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 s1...sn detected at respective levels x1...xn, in determining the propagation time tk of the acoustic waves from the level x1 to each level xk, in both advancing and delaying the signals sk by the time tk in relation to s1, in adjusting the signals for the effects of the acoustic impedence of the formation, in combining s1 and the signals sk thus shifted and adjusted to obtain a sum z1, in calculating a sum y? of s1 and of the thus delayed and adjusted signals sk, and in generating a signal u?', defined as an optimum estimation of the upgoing wave component, from the sums y? and z?.
390042
Schlumberger Canada Limited
Smart & Biggar
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