川西坳陷新场气田须家河组五段烃源岩分子地球化学特征

吴小奇; 陈迎宾; 刘全有; 王萍; 曾华盛; 王彦青; 胡烨; 黎华继

doi:10.3799/dqkx.2018.236

Volume 44 Issue 3

Mar. 2019

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Article Navigation > Earth Science > 2019 > 44(3): 859-871

Wu Xiaoqi, Chen Yingbin, Liu Quanyou, Wang Ping, Zeng Huasheng, Wang Yanqing, Hu Ye, Li Huaji, 2019. Molecular Geochemical Characteristics of Source Rocks in the 5th Member of Upper Triassic Xujiahe Formation, Xinchang Gas Field, West Sichuan Depression. Earth Science, 44(3): 859-871. doi: 10.3799/dqkx.2018.236

Citation:

Wu Xiaoqi, Chen Yingbin, Liu Quanyou, Wang Ping, Zeng Huasheng, Wang Yanqing, Hu Ye, Li Huaji, 2019. Molecular Geochemical Characteristics of Source Rocks in the 5th Member of Upper Triassic Xujiahe Formation, Xinchang Gas Field, West Sichuan Depression. Earth Science, 44(3): 859-871. doi: 10.3799/dqkx.2018.236

Citation:

Wu Xiaoqi, Chen Yingbin, Liu Quanyou, Wang Ping, Zeng Huasheng, Wang Yanqing, Hu Ye, Li Huaji, 2019. Molecular Geochemical Characteristics of Source Rocks in the 5th Member of Upper Triassic Xujiahe Formation, Xinchang Gas Field, West Sichuan Depression. Earth Science, 44(3): 859-871. doi: 10.3799/dqkx.2018.236

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Molecular Geochemical Characteristics of Source Rocks in the 5th Member of Upper Triassic Xujiahe Formation, Xinchang Gas Field, West Sichuan Depression

doi: 10.3799/dqkx.2018.236

Wu Xiaoqi^{1,2
,},
Chen Yingbin^1,2,
Liu Quanyou^{3
,
,},
Wang Ping²,
Zeng Huasheng²,
Wang Yanqing^1,2,
Hu Ye²,
Li Huaji⁴

1.
Research Center of Exploration and Development in Sichuan Basin, SINOPEC Petroleum Exploration and Production Research Institute, Chengdu 610041, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC Petroleum Exploration and Production Research Institute, Wuxi 214126, China
3.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China
4.
Exploration and Development Research Institute, SINOPEC Southwest Branch Company, Chengdu 610041, China

Received Date: 2018-10-09
Publish Date: 2019-03-15

Abstract

Abstract

The 5th member of the Upper Triassic Xujiahe Formation (T₃x⁵) is one of the important targets for terrigenous natural gas exploration in the Xinchang gas field in the West Sichuan Depression.The molecular geochemical characteristics have been analyzed in order to further determine the sedimentary environment of the T₃x source rocks.The studies indicate that the Pr/Ph ratio of soluble extract from the T₃x⁵ mudstone in the Xinchang gas field ranges from 0.26 to 1.70, and the relative contents of C₂₇ and C₂₉ in C₂₇-C₂₉ regular steranes are 31.2% and 44.6%, respectively.The gammacerane/C₃₀ hopane ratio ranges from 0.11 to 0.34, and the MPI₁, F₁ and 4-/1-MDBT values of the T₃x⁵ mudstone are all positively correlated with thermal maturity.The organic source of the T₃x⁵ mudstone is dominated by terrigenous higher plant, and lower hydrobiont and algae have also made a certain contribution.The T₃x⁵ mudstone was mainly deposited in the lacustrine environment, with part of the samples in the anoxic saline environment.Thermal maturity can significantly affect several indexes of aromatic compounds in coal-measure source rocks, and the three fluorene series of samples with R_o>1.25% and MDBTs/MDBFs ratios of samples with R_o>1.2% can not be directly used to determine the sedimentary environment.
- 5th member of Upper Triassic Xujiahe Formation (T₃x⁵),
- source rock,
- saturated hydrocarbon,
- aromatic hydrocarbon,
- maturity,
- three-fluorenes series,
- sedimentary environment,
- petroleum geology

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References(59)

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Molecular Geochemical Characteristics of Source Rocks in the 5th Member of Upper Triassic Xujiahe Formation, Xinchang Gas Field, West Sichuan Depression

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