In-situ formation stress determination using sonic logs and In- Borehole-Tomographic-Reconstruction of the near-borehole shear wave distribution

Carsten Pretzschner; Harald Lindner; Hendrik Rohler

doi:10.1071/ASEG2004ab117

ISSN: 2202-0586
E-ISSN:

oa In-situ formation stress determination using sonic logs and In- Borehole-Tomographic-Reconstruction of the near-borehole shear wave distribution
Authors Carsten Pretzschner^a, Harald Lindner^b and Hendrik Rohler^c
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^a Freiberg University, , Germany, [email protected] ^b Freiberg University, , Germany, [email protected] ^c RWE-dea, Hamburg, , Germany, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2004ab117
- Published online: 01 Dec 2004

Abstract

For advanced borehole logging interpretation of cross-dipole shear wave sondes with ‘In-Borehole-Tomographic-Reconstruction’ techniques an effective method for the determination of the mechanical stress distribution in the formation was developed.

The method includes the reconstruction of the 3D-shear wave velocity distribution in the immediate surrounding area of the borehole formation with tomographic algorithms.

The composition of the stress-induced shear wave velocity and comparison to the modelling results allow a quantitative interpretation. This log of the local formation stress anisotropy is excluded from both caliper-effects and the influences of shear wave velocity anisotropies caused by sedimentary effects.

As examples, logs of ratios of the local minimal/maximal formation-stress amplitudes Dsh/SH(z) were generated in a range of 0.86-0.99 for two gas production boreholes.

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References

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Mandal, B., 1991, Forward modelling for tomography: triangular grid-based Huygens’ principle method: Reservoir Delineation Consortium, 1991 Software Package, Massachusetts Institute of Technology, Cambridge, Massachusetts.
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Tang, X.M., Cheng, NY, and Cheng A.C, 1999b, Identifying and estimating formation stress from borehole monopole and cross-dipole acoustic measurements: SPWLA 40th annual Log ging symposium.
Willis, M.E, and Toksoz, M.N, 1983, Automatic P-wave and S-wave velocity determination from full waveform digital acoustic logs: Geophysics 48, 1631-1644.

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Article Type: Research Article

Keyword(s): Borehole geophysics; formation stress; sonic logging; tomography

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oa In-situ formation stress determination using sonic logs and In- Borehole-Tomographic-Reconstruction of the near-borehole shear wave distribution

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