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AAPG Bulletin, Preliminary version published online Ahead of Print 7 July 2021.

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


Petroleum system for the continuous oil Previous HitplayNext Hit in the lacustrine Lower Triassic, Junggar Basin, China

Keyu Tao1 , Jian Cao1 , Wenxuan Hu1 , Dongming Zhi2 , Dewen Lei2 , Yong Tang2 , Jianhua Qu2 , Xun Kang1 , and Leslie Magoon3

1 State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
2 Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
3 Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305, USA

Ahead of Print Abstract

Continuous petroleum accumulations are becoming important in petroleum exploration. This paper reports a new giant oil Previous HitplayNext Hit within a lacustrine stratum, the Lower Triassic Baikouquan Formation of the northwestern Junggar Basin, northwestern China. This giant oil Previous HitplayNext Hit is typical of a continuous petroleum accumulation, with low reservoir porosity and permeability (averages of 7.52% and 0.97 millidarcies, respectively), continuous hydrocarbon distribution over a large area (~1000 km2), stratigraphic traps, and anomalously high formation pressure (pressure coefficient > 1.1). Detailed molecular as well as isotope geochemistry of hydrocarbons reveal that crude oil and natural gas in the Baikouquan oil Previous HitplayNext Hit were derived predominantly from the alkaline lacustrine source rock of the lower Permian Fengcheng Formation. Dolomitic source rock is the main contributor to the crude oil and was deposited under anoxic, saline to hypersaline conditions. The Previous HitanalysisNext Hit of spatial difference of oil maturity in combination with stratigraphic burial-thermal evolution indicates multiple charging events and vertical migration as the dominant process for oil charging in the Baikouquan Previous HitplayNext Hit. As such, this giant Baikouquan oil Previous HitplayNext Hit is interpreted to differ from classic continuous petroleum accumulation due to long-distance (1500–2500 m) vertical hydrocarbon migration from deeper Permian sources, and is thus referred to a somewhat atypical continuous oil Previous HitplayNext Hit in this study. A strike-slip fault network provides migration pathways for the vertical oil-charging, and a fan–delta-front conglomerate facies provides high-quality reservoir rocks. The discovery of the Baikouquan oil Previous HitplayNext Hit exemplifies the successful exploration of a large-area continuous oil accumulation at a long distance (kilometers) from the pod of active source rock, and highlights new exploration opportunities worldwide within continuous oil accumulations, where the slope and central zones of a sag might represent viable petroleum reservoir rock despite their distance from a mature source rock.

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Please cite this AAPG Bulletin Ahead of Print article as:

Keyu Tao , Jian Cao , Wenxuan Hu , Dongming Zhi , Dewen Lei , Yong Tang , Jianhua Qu , Xun Kang , Leslie Magoon: Petroleum system for the continuous oil Previous HitplayTop in the lacustrine Lower Triassic, Junggar Basin, China, (in press; preliminary version published online Ahead of Print 07 July 2021: AAPG Bulletin, DOI:10.1306/07022119211.