Characteristics of Source Rocks and Formation of Reservoir Bitumen in Yinchuan Graben, Ordos Basin, China

Qingmeng Fu, Xianfeng Liu, Jingli Yao, Yongbo Wang, Nan Wu, Qinghai Xu, Jian Wang and Yilin Liang
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Qingmeng Fu: Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 434023, China
Xianfeng Liu: Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 434023, China
Jingli Yao: PetroChina Changqing Oilfield Company, Xi’an 710018, China
Yongbo Wang: PetroChina Changqing Oilfield Company, Xi’an 710018, China
Nan Wu: Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 434023, China
Qinghai Xu: Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 434023, China
Jian Wang: Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 434023, China
Yilin Liang: Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 434023, China

Energies, 2022, vol. 15, issue 13, 1-13

Abstract: The Yinchuan Graben is an important potential exploration area that is located on the western margin of the Ordos Basin. Over 8000 m of Cenozoic strata have been formed since the Cretaceous. With an integrated approach of cores observation, logging analysis, and geochemical analysis, we analyzed the characteristics of the Cenozoic source rocks in the Yinchuan Graben and determined the formation and destruction of the fossil oil reservoirs. With type III kerogen, the TOC of the dark mudstone in the Qingshuiying Formation is up to 7.5%, and the Ro is 0.95–1.04%, indicating the source rocks have entered the mature stage but the hydrocarbon generation potential is insufficient. A quantity of reservoir bitumen and oil-bearing fluid inclusions (GOI = 1.67–4%) were found in the Qingshuiying Formation sandstone in Well YQ-1, which indicates a fossil oil reservoir had existed. The fossil oil reservoir and reservoir bitumen were generated by the unexplored pre-Cenozoic strata in the Yinchuan Graben. The reservoir bitumen has high maturity and is associated with many fluid inclusions with a high homogenization temperature or CO 2 . This indicates that the bitumen was formed by the pyrolysis of the oil which was caused by the hot fluid migrating along with the deep fault belts.

Keywords: Yinchuan Graben; source rock evaluation; reservoir bitumen (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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