川东焦石坝地区页岩气特征及其意义

林俊峰; 胡海燕; 黎祺

doi:10.3799/dqkx.2017.091

Volume 42 Issue 7

Jul. 2017

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Article Navigation > Earth Science > 2017 > 42(7): 1124-1133

Lin Junfeng, Hu Haiyan, Li Qi, 2017. Geochemical Characteristics and Implications of Shale Gas in Jiaoshiba, Eastern Sichuan, China. Earth Science, 42(7): 1124-1133. doi: 10.3799/dqkx.2017.091

Citation:

Lin Junfeng, Hu Haiyan, Li Qi, 2017. Geochemical Characteristics and Implications of Shale Gas in Jiaoshiba, Eastern Sichuan, China. Earth Science, 42(7): 1124-1133. doi: 10.3799/dqkx.2017.091

Lin Junfeng, Hu Haiyan, Li Qi, 2017. Geochemical Characteristics and Implications of Shale Gas in Jiaoshiba, Eastern Sichuan, China. Earth Science, 42(7): 1124-1133. doi: 10.3799/dqkx.2017.091

Citation:

Lin Junfeng, Hu Haiyan, Li Qi, 2017. Geochemical Characteristics and Implications of Shale Gas in Jiaoshiba, Eastern Sichuan, China. Earth Science, 42(7): 1124-1133. doi: 10.3799/dqkx.2017.091

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Geochemical Characteristics and Implications of Shale Gas in Jiaoshiba, Eastern Sichuan, China

doi: 10.3799/dqkx.2017.091

Lin Junfeng^{1,2
,},
Hu Haiyan^{3,4
,
,},
Li Qi⁵

1.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2.
State Administration of Work Safety Technology Platform for Ground Control of Deep Mines & Gas Drainage, Jiaozuo 454000, China
3.
School of Geosciences, Yangtze University, Wuhan 430100, China
4.
Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, China
5.
Shanghai Branch of China National Offshore Oil Corporation, Shanghai 200050, China

Received Date: 2016-11-01
Publish Date: 2017-07-15

Abstract

Abstract

The Wufeng-Longmaxi shales in Jiaoshiba is rich in natural gas. However, the research on the geochemical characteristic of the shale gas is weak, and its geological significance is still unclear. This article discusses the origin type and the "full reversal" carbon isotopic composition of shale gas from Wufeng Formation-Longmaxi Formation based on the analysis of the shale gas component and its isotope. The high hydrocarbon generation potential of Wufeng-Longmaxi shales, the positive correlation of the abundance of organic carbon and the content of gas, the similar carbon isotope distribution between methane and kerogen and the overpressure in Wufeng Formation-Longmaxi Formation suggest the shale gas should be generated from and preserved in the Wufeng Formation-Longmaxi Formation. The content of methane and its isotope indicate the stage of thermal maturity for shale gas has reached the overmature phase and the shale gas is mainly dry gas. The shale gas is mainly formed from the cracking of oil generated early based on the ratio of ln(C₁/C₂) and ln(C₂/C₃). The "full reversal" carbon isotope distribution of shale gas resulted from the oil cracking in a relatively closed system and it also reflects a favorable preservation and accumulation conditions for shale gas.
- carbon isotope,
- shale gas,
- Wufeng Formation,
- Longmaxi Formation,
- Jiaoshiba,
- petroleum geology

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References(62)

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