准噶尔盆地达巴松凸起三叠系白碱滩组油气地球化学特征及来源

doi:10.12108/yxyqc.20250607

Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 71-87.doi: 10.12108/yxyqc.20250607

• PETROLEUM EXPLORATION • Previous Articles

Hydrocarbon geochemical characteristics and source of Triassic Baijiantan Formation in Dabasong uplift, Junggar Basin

JIANG Mengya, JIANG Zhongfa, LIU Longsong, WANG Jiangtao, CHEN Hailong, WANG Xueyong, LIU Hailei

Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China

Received:2025-05-15 Revised:2025-08-06 Published:2025-11-07

Abstract

Abstract: Triassic Baijiantan Formation of Dabasong uplift in Junggar Basin has encountered large-scale highquality sand bodies and achieved industrial oil and gas flow, which show that oil and gas resources in the middle and shallow layers of Dabasong uplift have significant potential. Based on the analysis data of oil and gas samples from newly drilled wells, the hydrocarbon geochemical characteristics of Baijiantan Formation in Penbei 1 well area were systematically analyzed, and the sources of oil and gas were revealed. The results show that: (1) The crude oil of Baijiantan Formation in Penbei 1 well area of Dabasong uplift in Junggar Basin has relatively high viscosity and freezing point. The whole oil carbon isotope is relatively light, with the value of -29.38‰, and Pr/Ph of 0.69-1.29, and containing β-carotane and gammacerane, it is mature to high-mature light crude oil.(2) The natural gas composition of Baijiantan Formation in Penbei 1 well area of the study area is dominated by methane, with wet gas and dry gas coexisting. The ethane carbon isotope is relatively light, ranging from -31.34‰ to -27.83‰. Dimethylcyclopentane accounts for a large proportion of C₇ light hydrocarbon compound, and oil-type gas and mixed gas are distributed.(3) The crude oil of Baijiantan Formation in Penbei 1 well area mainly originates from Permian Fengcheng Formation source rocks, with significant contributions from lower aquatic organisms in reducing environments. Natural gas mainly comes from Permian Fengcheng Formation source rocks, and part of it originates from Carboniferous source rocks.(4) Baijiantan Formation oil and gas reservoirs in Penbei 1 well area are lithologic or fault-lithologic oil and gas reservoirs with dual-source hydrocarbon-supply, multi-stage oil and gas charging, sedimentary facies belts controlling, and segmented by faults.

Key words: crude oil characteristics, natural gas characteristics, oil-gas source correlation, Baijiantan Formation, Triassic, Dabasong uplift, Junggar Basin

CLC Number:

TE122

JIANG Mengya, JIANG Zhongfa, LIU Longsong, WANG Jiangtao, CHEN Hailong, WANG Xueyong, LIU Hailei. Hydrocarbon geochemical characteristics and source of Triassic Baijiantan Formation in Dabasong uplift, Junggar Basin[J].Lithologic Reservoirs, 2025, 37(6): 71-87.

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