G - Physics – 01 – V
Patent
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G01V 1/40 (2006.01) E21B 49/00 (2006.01) G01V 1/44 (2006.01)
Patent
CA 1290842
ABSTRACT A borehole logging method and system are pro- vided for obtaining a measure of formation anisotropy in formations adjacent the borehole. The system comprises an elongated housing for suspension within the borehole. first and second asymmetric pressure wave sources for gen- erating shear waves directly within formations adjacent the borehole are mounted with the housing. Additionally, first and second sets of receivers are mounted with the housing for recording first and second signals representa- tive of the earth's response to the first and second shear waves propagating in the formations adjacent the borehole, respectively. The first set of receivers have an orienta- tion matching the first source, and the second set of receivers have an orientation matching the second source. The system further includes a processor for determining a measure of formation anisotropy from the first and second recorded signals. With a first set of source/receiver pairs having matched polarizations and azimuthal orienta- tions, first signals. representative of the imparted acoustic shear wave energy after propagation through a portion of the formations adjacent the borehole, are recorded. With a second set of source/receiver pairs having matched polarizations and azimuthal orientations different from the first set of source/receiver pairs, second signals, representative of the imparted acoustic shear wave energy after propagation through a portion of the formations adjacent the borehole, are recorded. The first and second recorded signals can be processed for events representative of first and second shear wavefront arrivals of the imparted acoustic shear wave energy. For- mation anisotropy can be characterized with measures of the events representative of the first and second shear wave arrivals in the first and second recorded signals. TDS:cm/tb/cm 86269ART0132
547248
Smith Martin L.
Sondergeld Carl H.
Amoco Corporation
Gowling Lafleur Henderson Llp
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