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Ahead of Print Abstract
DOI:10.1306/12152319179
Differential petroleum charging controlled by movements of two strike-slip faults in the Shunbei area, Tarim Basin, Northwest China
Fuyun Cong1 , Jinqiang Tian1 , Fang Hao1 , Qi Wang1 , Jianzhang Liu2 , and Zicheng Cao3
1 Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
2 Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3 Research Institute of Petroleum Exploration and Production, SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China
Ahead of Print Abstract
Recently, considerable hydrocarbon reserves have been discovered in Lower-Middle Ordovician carbonate reservoirs situated surrounding two conjugate strike-slip fault zones in the Shunbei oil field, Tarim Basin, northeastern China. Through the integrated analysis of crude oil physical properties, geochemical compositions and fluid inclusions, the differential petroleum charging history of the Shunbei oilfield has been investigated. For the SB5 fault zone, two discrete ranges of homogenization temperature of coeval aqueous inclusions indicate intense charging during the early Yanshan orogeny, with minor charging during the late Himalayan orogeny. For the SB1 fault zone, the extended homogenization temperature range probably reflects continuous charging from the early Yanshan to late Himalayan Orogenies. The presence of bitumen indicates an earliest petroleum charging event during the late Caledonian Orogeny. Differential petroleum charging during the Himalayan orogeny caused stark differences in the thermal maturity of trapped oil and the mixing of oil with variable maturity, with the SB1 fault zone receiving more intense charging of late-stage oils than the SB5 fault zone. The differential petroleum charging during the Himalayan orogeny can be explained by preferential reactivation of NE-trending strike-slip faults, controlled by the regional NE 45° oriented compressive stress field. Crude oil with high maturity would preferentially migrate vertically via the reactivated NE-striking SB1 fault zone, charging into reservoirs, resulting in the current maturity differences in the trapped oils in the Shunbei oil field. These results illustrate the preferential vertical petroleum migration along the re-activated fault and the controlling role of regional stress field on fault behaviors.
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