Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1997-11-17
2000-01-25
Oda, Christine
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 48, 367 57, G01V 140
Patent
active
060184957
ABSTRACT:
A method is disclosed for borehole compensation of measurements of earth formations penetrated by a borehole including differential time (.DELTA.t) measurements obtained from a borehole tool in the formation. The borehole tool includes at least one transmitter and a plurality of receivers spaced apart from each transmitter. Each transmitter generates a waveform, and the receivers are responsive to the waveform. A receiver array .DELTA.t measurement is generated for a depth interval spanned by the receivers by cross-correlating receiver array waveforms relevant to the spanned depth interval. A synthesized transmitter array .DELTA.t measurement corresponding to the spanned depth interval is generated by cross-correlating selected transmitter array waveforms. The transmitter array waveforms are selected corresponding to the spanned depth interval by identifying the receiver arrays whose transmitter locations fall within the spanned depth interval and identifying a set of waveforms from the identified receiver arrays to obtain the transmitter array waveforms. The receiver array .DELTA.t measurement is averaged with the transmitter array .DELTA.t measurement to obtain a borehole compensated .DELTA.t measurement corresponding to each transmitter. When the borehole tool includes more than one transmitter, all the borehole compensated .DELTA.t measurements corresponding to each transmitter are averaged to obtain a comprehensive borehole compensated .DELTA.t measurement.
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Adamcik Albert J.
Jolly Anthony
Kanak Wayne I.
Oda Christine
Schlumberger Technology Corporation
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