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Abstract

AAPG Bulletin, V. 105, No. 2 (February 2021), P. 357-390.

Copyright ©2021. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/07272019064

Multiple thrust detachments and their implications for hydrocarbon accumulation in the northeastern Sichuan Basin, southwestern China

Chuanxin Li,1 Dengfa He,2 Guo Lu,3 Kai Wen,4 Abijah Simon,5 and Yanpeng Sun6

1Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, China University of Geosciences, Ministry of Education, Haidian District, Beijing, China; [email protected]
2Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, China University of Geosciences, Ministry of Education, Haidian District, Beijing, China; [email protected]
3China University of Geosciences, Beijing, China; [email protected]
4China University of Geosciences, Beijing, China; [email protected]
5Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, California; [email protected]
6Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts; present address: Shell Exploration & Production Company, Houston, Texas; [email protected]

ABSTRACT

The northeastern Sichuan Basin thrust belt located in southwestern China, is a large-scale intracontinental thrust system with multiple detachments represented by a series of subparallel chevron anticlines. We conduct a comprehensive study of the geometry and kinematics of the thrust belt and its implications for the petroleum system based on seismic-reflection profile interpretation, field investigation, analysis of wells, and geochronology. Two major detachments occur within the allochthonous succession: the (1) gypsum-bearing lower to middle Cambrian Longwangmiao and Gaotai Formations and (2) Lower Triassic Jialingjiang Formation. The dark gray shales in the lower Silurian Longmaxi Formation are a favorable source rock that may also act as a third detachment in this study area. The stratigraphic succession is divided by three detachments into three structural intervals: (1) lower Cambrian–Silurian structural interval, (2) middle Silurian–Triassic structural interval, and (3) upper Triassic–Jurassic structural interval. The lower structural interval may be a good candidate for hydrocarbon exploration because of the occurrence of high-quality source rock and its reservoir-trapping evolutionary history.

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