羌塘盆地毕洛错地区古油藏地球化学特征与油源对比

杨易卓; 黄志龙; 赵珍; 唐友军

doi:10.3799/dqkx.2022.008

Volume 47 Issue 5

May 2022

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Yang Yizhuo, Huang Zhilong, Zhao Zhen, Tang Youjun, 2022. Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area, Qiangtang Basin. Earth Science, 47(5): 1834-1848. doi: 10.3799/dqkx.2022.008

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Yang Yizhuo, Huang Zhilong, Zhao Zhen, Tang Youjun, 2022. Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area, Qiangtang Basin. Earth Science, 47(5): 1834-1848. doi: 10.3799/dqkx.2022.008

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Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area, Qiangtang Basin

doi: 10.3799/dqkx.2022.008

Yang Yizhuo^{1, 2
,},
Huang Zhilong^{1, 2},
Zhao Zhen^{3
,
,},
Tang Youjun⁴

1.
College of Geosciences, China University of Petroleum, Beijing 102249, China
2.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
3.
Chinese Academy of Geological Sciences, Beijing 100037, China
4.
College of Resources and Enviroment, Yangtze University, Wuhan 430100, China

Received Date: 2021-12-06
Publish Date: 2022-05-25

Abstract

Abstract

Qiangtang basin is a large Mesozoic marine sedimentary basin, in which several sets of source rocks are developed, and many paleo-reservoirs and hydrocarbon indications are discovered. Determining the oil source of paleo-reservoirs is very important for oil and gas exploration. In order to clarify the oil source of the paleo-reservoir, geochemical analysis of oil and source rock samples is carried out in this paper. The results show that the paleo-reservoirs can be divided into two types: type Ⅰ paleo-reservoirs are in the mature-high mature stage in general with the high content of C₂₄ tetracyclic terpane, the low tricyclic terpane abundance, C₂₉ regular sterane with certain advantages in content, and high C₂₉ hopane content, reflecting the contribution of terrigenous organic matter. Type Ⅱ paleo-reservoir is in the low mature-mature stage in general, with C₂₃ tricyclic terpane as the main peak, low content of C₂₄ tetracyclic terpane and the domination of C₂₇ regular sterane, indicating the precursor was mainly lower aquatic organisms. The oil-source correlation result shows that the two types of paleo-reservoirs come from different source rocks. Type Ⅰ crude oil comes from the source rocks of Zhana Formation of Upper Triassic, and type Ⅱ crude oil is mainly contributed by the source rocks of Quse Formation of Lower Jurassic.
- Qiangtang basin,
- paleo-reservoir,
- source rock,
- biomarker,
- oil-source correlation,
- petroleum geology

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Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area, Qiangtang Basin

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