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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI: 10.1306/05072524042
Differential (re-)activation and hydrocarbon enrichment of segments of intracratonic strike-slip faults in the central Tarim Basin, northwestern China
Zhuo Liu,1 Jinqiang Tian,2 Fang Hao,3 Xianzhang Yang,4 Ke Zhang,5 Yongquan Chen,6 Xiaoxue Wang,7 Feifei Yuan,8 Li Quan,9 Ping Wang,10 and Fuyun Cong11
1State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
2State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
3State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
4Research and Development (R & D) Center for Ultra-Deep Complex Reservoir Exploration and Development, China National Petroleum Corporation (CNPC), Korla, China; [email protected]
5R & D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla, China; [email protected]
6R & D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla, China; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China; [email protected]
7R & D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla, China; [email protected]
8School of Geosciences, Yangtze University, Wuhan, China; [email protected]
9State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
10R & D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla, China; [email protected]
11State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; School of Geosciences, China University of Petroleum (East China), Qingdao, China; [email protected]
ABSTRACT
Intracratonic strike-slip faults are pivotal in controlling hydrocarbon migration and accumulation within deep carbonate reservoirs, yet their multiphase reactivation histories and spatio-temporal coupling with hydrocarbon charging remain poorly constrained. This study integrates calcite U-Pb geochronology, fluid inclusion microthermometry, and fluorescence spectroscopy to resolve the evolution of the F117 and F119 strike-slip fault systems in the ultradeep (>7000 m) Ordovician strata of the Tarim Basin. The F117 fault records six reactivation phases, from the middle Caledonian Orogeny episode II (452 ± 3.3 Ma) to the Himalayan Orogeny (68 ± 54 Ma), and the F119 fault exhibits five phases, terminating at the Indosinian Orogeny but with intensified activity associated with the late Hercynian–Indosinian Orogenies (251 ± 24 and 264 ± 49 Ma). Hydrocarbon charging occurred in three distinct episodes: middle–late Caledonian Orogeny (443.2 ± 6.1, 445.3 ± 3.9, 444.8 ± 8.6, and ca. 440–420 Ma) migration of low-maturity oils (wavelength of maximum intensity [λmax]: 520–480 nm), late Hercynian–Indosinian Orogenies (ca. 290–210, ca. 350–250, 264 ± 49, and ca. 310–210 Ma) recharging of high-maturity oils (λmax: 480–435 nm), and a unique Himalayan-phase methane influx (68 ± 54 Ma) in F117. Critically, fault segment architecture governs reservoir heterogeneity: linear segments (e.g., F117–HD32, F119–MS7-H4) preserved Caledonian oils due to structural stability; extensional segments and intersections (e.g., F117–MS5, F119–MS701) experienced post-Caledonian leakage and Hercynian–Indosinian recharging; and contractional segments (e.g., F117–MS2, F119–MS702) retained hydrocarbons only during late-stage (Hercynian–Indosinian) fault reactivation.
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