发明名称 |
METHOD FOR CHARACTERIZING SHEAR WAVE FORMATION ANISOTROPY |
摘要 |
A method of characterizing shear wave anisotropy in a formation includes obtaining crossed-dipole waveforms from a borehole penetrating the formation over a range of depths and frequencies, determining far-field slowness in a fast-shear and slow-shear direction using a low-frequency portion of the crossed-dipole waveforms, and determining near-wellbore slowness in the fast-shear and slow-shear directions using a high-frequency portion of the crossed-dipole waveforms. The method also includes marking a selected depth of the formation as having intrinsic anisotropy if at the selected depth the far-field slowness in the fast-shear direction is less than the far-field slowness in the slow-shear direction and the near-wellbore slowness in the fast-shear direction is less than the near-wellbore slowness in the slow-shear direction. The selected depth is marked as having stress-induced anisotropy if the far-field slowness in the fast-shear direction is less than the far-field slowness in the slow-shear direction and the near-wellbore slowness in the fast-shear direction is greater than the near-wellbore slowness in the slow-shear direction.
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申请公布号 |
US2008106975(A1) |
申请公布日期 |
2008.05.08 |
申请号 |
US20070940236 |
申请日期 |
2007.11.14 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
DONALD J. A.;BRATTON TOM R.;WALSH JOHN |
分类号 |
G01V1/30 |
主分类号 |
G01V1/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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