Effects Of Formation Stress On Logging Measurements
Name
2000.10 Huang et al.pdf
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630.7 KB
Format
Adobe PDF
Checksum (MD5)
823dee203ebe60b63cf556d6af57d018
Author(s)
Huang, Xiaojun
Zhu, Zhenya
Toksoz, M. Nafi
Burns, Daniel R.
Date Issued
2000
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;2000-10
Abstract
We show both theoretically and experimentally how stress concentrations affect the
velocity field around a borehole surrounded by a formation with intrinsic ortohombic
anisotropy. When F[subscript x] = F[subscript y], no extra anisotropy is induced, however, isotropic stress concentrations are developed in the neighborhood of the borehole. Extra anisotropy is induced only when F[subscript x] ≠ F[subscript y], and the level of induced anisotropy is affected by the intrinsic anisotropy of the formation. Experiments show that monopole acoustic waves are more sensitive to properties in the neighborbood of the borehole than dipole waves. However, only dipole logging can determine the direction of anisotropy. A combination of monopole and dipole logging may lead to a better investigation of intrinsic as well as induced anisotropy of the formation.
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