Method and apparatus for acquiring borehole seismic data in two opposite directions
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United States of America Patent
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-
Jul 6, 1993
Grant Date -
N/A
app pub date -
Aug 19, 1991
filing date -
Dec 19, 1989
priority date (Note) -
Expired
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Abstract
The invention relates to a method and apparatus for acquiring borehole seismic data in two opposite directions in a borehole. Acquisition consists in emitting a pressure wave (R, R') at a point (E) in the borehole (PU), and, at a point (R) in the borehole (PU) that is offset relative to the pressure wave emission point (E), in detecting the echoes reflected and refracted by the adjacent geological formations (Ci) in such a manner as to discriminate between pressure waves reflected and refracted by the above-mentioned geological formations in a longitudinal plane of symmetry (P) of the borehole (PU). The discrimination is performed on the basis of detecting the sum and the difference of echo signals coming from opposite directions. The invention is applicable to determining horizons above and below an inclined borehole.
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