川南五峰组-龙马溪组页岩流体活动及压力演化过程

吴娟; 陈学忠; 刘文平; 吴伟; 高阳; 罗超; 邓宾; 周政

doi:10.3799/dqkx.2021.049

Volume 47 Issue 2

Feb. 2022

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Article Navigation > Earth Science > 2022 > 47(2): 518-531

Wu Juan, Chen Xuezhong, Liu Wenping, Wu Wei, Gao Yang, Luo Chao, Deng Bin, Zhou Zheng, 2022. Fluid Activity and Pressure Evolution Process of Wufeng-Longmaxi Shales, Southern Sichuan Basin. Earth Science, 47(2): 518-531. doi: 10.3799/dqkx.2021.049

Citation:

Wu Juan, Chen Xuezhong, Liu Wenping, Wu Wei, Gao Yang, Luo Chao, Deng Bin, Zhou Zheng, 2022. Fluid Activity and Pressure Evolution Process of Wufeng-Longmaxi Shales, Southern Sichuan Basin. Earth Science, 47(2): 518-531. doi: 10.3799/dqkx.2021.049

Citation:

Wu Juan, Chen Xuezhong, Liu Wenping, Wu Wei, Gao Yang, Luo Chao, Deng Bin, Zhou Zheng, 2022. Fluid Activity and Pressure Evolution Process of Wufeng-Longmaxi Shales, Southern Sichuan Basin. Earth Science, 47(2): 518-531. doi: 10.3799/dqkx.2021.049

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Fluid Activity and Pressure Evolution Process of Wufeng-Longmaxi Shales, Southern Sichuan Basin

doi: 10.3799/dqkx.2021.049

Wu Juan^{1, 2
,
,},
Chen Xuezhong³,
Liu Wenping⁴,
Wu Wei⁴,
Gao Yang⁵,
Luo Chao⁴,
Deng Bin^{1, 2},
Zhou Zheng¹

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
2.
College of Energy, Chengdu University of Technology, Chengdu 610059, China
3.
Sichuan Changning Gas Development Co. Ltd., Chengdu 610056, China
4.
Shale Gas Research Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China
5.
Strategic Research Center of Oil and Gas Resources, Ministry of Natural Resources, Beijing 100034, China

Received Date: 2021-04-18
Publish Date: 2022-02-25

Abstract

Abstract

Fluid activity and pressure evolution are important indicators for shale gas enrichment or destruction. Based on core observation and petrographic method, the mineral filling sequence of Wufeng-Longmaxi shales in Ningxi and Luzhou area, southern Sichuan Basin is determined. On this basis, combined with fluid inclusion tests, the stages and characteristics of fluid activities in the reservoir are analyzed. Finally, Basin Modeling is used to recover the evolution of formation pressure under complex structural background. The results show that fractures are mainly filled with calcite, and quartz is found in some veins. Abundant hydrocarbon bearing inclusions are observed in vein minerals, including yellow or blue fluorescent gas-liquid hydrocarbon inclusions, black bitumen inclusions and natural gas inclusions. At least two phases of fluid filling have been detected in both Ningxi Block and Luzhou Block, including one stage of oil filling in Late Permian to Early Triassic and one stage of natural gas filling in Jurassic. Before Paleogene deposition, the formation pressure coefficient of Wufeng-Longmaxi Formation had reached the maximum value. The main fault in Luzhou Block did not cut through the regional cap rock, and the amount of uplift and erosion in Late Cenozoic was relatively low. Therefore, the overall preservation conditions of Luzhou Block are good, and the current pressure coefficient is above 2.0. However, the main fault in Ningxi Block was activated and cut through the regional cap rock during the late Indosinian-Yanshanian movements, and was obviously reformed by Cenozoic tectonic uplift and denudation, resulting in overpressure release.
- southern Sichuan Basin,
- Wufeng-Longmaxi Formations,
- shale gas,
- fluid inclusion,
- overpressure,
- basin modeling,
- petroleum geology

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References(57)

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