Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1987-06-26
1989-03-28
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 25, 367 34, G01V 140
Patent
active
048170593
ABSTRACT:
Waveform data obtained in a borehole by a tool having a sonic source and an array of sonic detectors is analyzed to obtain an image of formation features within several tens of feet of the borehole, such as fractures, bed boundaries and other boreholes. A value of background sonic slowness is derived from the data and used to determine the sonic energy transit time from the source to each detector via each point in a grid of points extending into the formation and along the borehole. The time for a particular detector/point pair is used to extract the amplitude of the waveform from that detector at that time relative to operation of the source. Such amplitudes for the same point and for different detectors and tool positions are cumulated. The final values for all points are plotted as a variable density display which provides the desired image.
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J. P. Lindsey & Al Herman, Digital Migration; reprinted from Oil and Gas Journal, 38, 112-115.
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Hornby Brian E.
Wiggins Ralphe
Coker David G.
Lobo Ian J.
Schlumberger Technology Corporation
Smith Keith G. W.
Tager Clifford L.
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