Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1984-12-28
1987-10-06
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 32, 367 73, 367 75, 364422, 181104, G01V 114, G01V 140
Patent
active
046987924
ABSTRACT:
The shear velocity of a formation traversed by a fluid-filled borehole is determined in the presence of a significant flexural mode arrival. A plurality of waveforms are obtained from a dipole acoustic investigation of the formation relative to a common location in the borehole. The flexural mode phase velocity as a function of frequency is determined. If a low frequency asymptote is identifiable, it is reported as the shear velocity. If a low frequency asymptote is not identifiable, however, a plurality of additional curves of the flexural mode phase velocity as a function of frequency are theoretically determined, based on respective estimated shear velocities. These theoretically determined curves are respectively fitted to the curve determined from the waveforms, until a satisfactory least error fit is achieved. The last-estimated shear velocity is reported as the shear velocity of the formation.
REFERENCES:
patent: 4258322 (1978-05-01), Rocroi et al.
patent: 4307616 (1981-12-01), Valill
G. A. Winbow, "How to Separate Compressional and Shear Arrivals in a Sonic Log", 1980, pp. 2107-2130, 50th International Mtg. of SEG.
Chang Shu-Kong
Kurkjian Andrew L.
Borst Stephen L.
Carroll David H.
Coker David G.
Moskowitz Nelson
Schlumberger Technology Corporation
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