Hindawi Geofluids Volume 2021, Article ID 5538174, 25 pages https://doi.org/10.1155/2021/5538174 Research Article Early Paleozoic Extension-Compression Transition and Formation of a Paleo-Oil Reservoir System in the NW Sichuan Basin: Implications for Deeply Buried Hydrocarbon Accumulation Xiao Liang ,1,2 Shu-gen Liu ,1,3 Liang-liang Wu ,4 Bin Deng ,1 Jing Li ,2 Meng-lin Zhang ,2 and Xu-hang Tan 2 1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China 2CNPC Chuanqing Drilling Engineering, Chengdu, Sichuan 610051, China 3Xihua University, Chengdu, 610039 Sichuan, China 4State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou, Guangdong 510640, China Correspondence should be addressed to Shu-gen Liu;
[email protected] Received 6 January 2021; Revised 3 March 2021; Accepted 21 April 2021; Published 27 May 2021 Academic Editor: Kun Zhang Copyright © 2021 Xiao Liang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Owing to multiple tectonic events after the Late Triassic, the northern segment of the western Sichuan depression (NSWSCD) has a complex geological history of significant uplift and deeply buried. With abundant oil and gas play in the NSWSCD, the study of paleo-oil reservoir systems and early hydrocarbon accumulation in this area is of great significance for deep marine hydrocarbon distribution prediction in complex structural settings. Analysis on the northern section of the Mianyang- Changning Intracratonic Sag (MY-CN IS) and the Tianjingshan Paleouplift (TJS PU), the two Early Paleozoic tectonic units are fi laterally superimposed.