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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI: 10.1306/1219181413417207
Analysis of fault damage zones using three-dimensional
seismic
coherence in the Anadarko Basin, Oklahoma
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Zonghu Liao,1 Hui Liu,2 Brett M. Carpenter,3 Kurt J. Marfurt,4 and Ze’ev Reches5
1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; [email protected]
2College of Geosciences, China University of Petroleum, Beijing, China; [email protected]
3School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma; [email protected]
4School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma; [email protected]
5School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma; [email protected]
ABSTRACT
Fault damage zones may significantly affect subsurface fluid migration and the development of unconventional resources. Most analyses of fault damage zones are based on direct field observations, and we expand these analyses to the subsurface by investigating the damage zone structure of an approximately 32-km (∼105-ft)-long right-lateral strike-slip fault in Oklahoma. We used the three-dimensional (3-D) seismic
attribute of coherence to first define its regional and background levels, and then we evaluated the damage zone dimensions at multiple sites. We found damage zone thickness of approximately 1600 m (∼5300 ft) at a segment that is dominated by subsidiary faults, and it is slightly thicker at a segment with a pull-apart basin. The damage zone intensity decays exponentially with distance from the fault core, in agreement with field observations and distribution of
seismic
events. The coherence map displays a strong asymmetry of the damage zone
between
the two sides of the 3-D fault, which is related to the subsidiary structures of the fault zone. We discuss the effects of heterogeneous stress field on damage zone evolution through the detected subsidiary structures. It appears that
seismic
coherence is an effective tool for subsurface characterization of fault damage zones.
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