An approach for predicting stress-induced anisotropy around a borehole
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Fang_Approach-for-predicting.pdf
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Author(s)
Fang, Xinding
Fehler, Michael
Zhu, Zhenya
Chen, Tianrun
Brown, Stephen
Cheng, Arthur
Toksoz, M. Nafi
Date Issued
April 2013
Journal
Geophysics
Publisher
Society of Exploration Geophysicists
Citation
Fang, Xinding, Michael Fehler, Zhenya Zhu, Tianrun Chen, Stephen Brown, Arthur Cheng, and M. Nafi Toksoz. “An approach for predicting stress-induced anisotropy around a borehole.” GEOPHYSICS 78, no. 3 (April 11, 2013): D143-D150. © 2013 Society of Exploration Geophysicists
Version
Final published version
Abstract
Formation elastic properties near a borehole may be altered from their original state due to the stress concentration around the borehole. This could result in a biased estimation of formation properties but could provide a means to estimate in situ stress from sonic logging data. To properly account for the formation property alteration, we propose an iterative numerical approach to calculate stress-induced anisotropy around a borehole by combining a rock physics model and a finite-element method. We tested the validity and accuracy of our approach by comparing numerical results to laboratory measurements of the stress-strain relation of a sample of Berea sandstone, which contains a borehole and is subjected to a uniaxial stress loading. Our iterative approach converges very fast and can be applied to calculate the spatially varying stiffness tensor of the formation around a borehole for any given stress state.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1190/geo2012-0145.1
