发明名称 |
Method and apparatus for acoustic dipole shear wave well logging |
摘要 |
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.
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申请公布号 |
US4698792(A) |
申请公布日期 |
1987.10.06 |
申请号 |
US19840687075 |
申请日期 |
1984.12.28 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
KURKJIAN, ANDREW L.;CHANG, SHU-KONG |
分类号 |
G01V1/44;(IPC1-7):G01V1/14;G01V1/40 |
主分类号 |
G01V1/44 |
代理机构 |
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地址 |
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