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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/06071817354
Structural characterization of intracratonic strike-slip faults in the central Tarim Basin
Shang Deng,1 Huili Li,2 Zhongpei Zhang,3 Jibiao Zhang,4 and Xin Yang5
1Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; Northwest Oilfield Company, Sinopec, Urumuqi, Xinjiang, China; [email protected]
2Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; Northwest Oilfield Company, Sinopec, Urumuqi, Xinjiang, China; [email protected]
3Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; [email protected]
4Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; [email protected]
5Petroleum Exploration and Production Research Institute, Sinopec, Beijing, China; [email protected]
ABSTRACT
The strike-slip fault
systems in the central Tarim Basin, China, afford an exceptional opportunity to document the structural characteristics and evolution process of small displacement intracratonic strike-slip faults using three-dimensional seismic reflection data. These strike-slip faults display subvertical segments at depth and en echelon normal
fault
zones where relatively shallow.
Fault
segmentation and flower structures can be commonly observed in plan view and cross-section view, respectively.
Consistent with the notion that segment coalescence is the fundamental process for fault
evolution, the mean segment length of representative strike-slip faults examined in this study is positively correlated to the measured
fault
offset. The width of the en echelon normal
fault
zone is positively correlated with the estimated maximum overburden thickness. The integrated data sets suggest that the evolution of the conjugate
fault
array followed a sequential evolution process instead of forming simultaneously. The switch in slip direction of the master
fault
of the conjugate
fault
array is attributed to the change of stress orientation. Regarding individual strike-slip faults, increase in displacement induces the formation of faults with lower
fault
-array angles linking initially formed en echelon normal faults. In cross sections, throughgoing
fault
surfaces can also form, connecting the lower subvertical
fault
segment and the upper en echelon normal faults.
The presented data sets and evolution models established in this study can be used as tools to better predict the structural attributes of subsurface strike-slip fault
systems with important consequences for reservoir formation and hydrocarbon accumulation in the Tarim Basin in particular, and in ancient marine basins in general.
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