莺歌海盆地东方-乐东区中新统盖层岩石学特征及封盖性分析

代龙; 尤丽; 招湛杰; 钟佳; 徐守立; 娄敏

doi:10.3799/dqkx.2019.176

Volume 44 Issue 8

Aug. 2019

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Article Navigation > Earth Science > 2019 > 44(8): 2677-2685

Dai Long, You Li, Zhao Zhanjie, Zhong Jia, Xu Shouli, Lou Min, 2019. Petrological Characteristics and Sealing Analysis of Mesozoic Caprock in Dongfang-Ledong Area, Yinggehai Basin. Earth Science, 44(8): 2677-2685. doi: 10.3799/dqkx.2019.176

Citation:

Dai Long, You Li, Zhao Zhanjie, Zhong Jia, Xu Shouli, Lou Min, 2019. Petrological Characteristics and Sealing Analysis of Mesozoic Caprock in Dongfang-Ledong Area, Yinggehai Basin. Earth Science, 44(8): 2677-2685. doi: 10.3799/dqkx.2019.176

Citation:

Dai Long, You Li, Zhao Zhanjie, Zhong Jia, Xu Shouli, Lou Min, 2019. Petrological Characteristics and Sealing Analysis of Mesozoic Caprock in Dongfang-Ledong Area, Yinggehai Basin. Earth Science, 44(8): 2677-2685. doi: 10.3799/dqkx.2019.176

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Petrological Characteristics and Sealing Analysis of Mesozoic Caprock in Dongfang-Ledong Area, Yinggehai Basin

doi: 10.3799/dqkx.2019.176

1.
Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang 524057, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2019-01-29
Publish Date: 2019-08-15

Abstract

Abstract

Commercial gas fields have been discovered in Dongfang-Ledong area of Yinggehai Basin, but little research has been done on gas field caprock, especially on mudstone caprock type and pore throat structure. In this paper, the mineral composition, geochemistry, diagenetic evolution and pore structure characteristics of mudstone in the area are studied in depth by using the data of thin sections, geochemistry, XRD and element analysis.The results show that the distribution of mudstone caprocks in the first and second members of the Mesozoic Huangliu Formation in Dongfang-Ledong area of Yinggehai Basin is the most stable, and the caprocks are greatly influenced by terrigenousclastic supply and calcareous fossil fragments. The content of terrigenousclastic particles and calcareous fossil fragments in the high-quality caprocks in the study area is low, and secondary dissolution pore and micro-fracture are not developed.Dehydration of clay minerals during burial diagenesis and hydrocarbon expulsion by thermal evolution of organic matter are the main genesis of low-velocity mudstones. Mudstone caprock is dominated by microporous throat and ultraporousthroat, which is not conducive to gas seepage and obviously hinders the upward escape of oil and gas, and the overall sealing of caprock is good.
- mudstone caprock,
- petrological,
- Miocene,
- Dongfang area,
- Ledong area,
- Yinggehai Basin

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References(42)

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Petrological Characteristics and Sealing Analysis of Mesozoic Caprock in Dongfang-Ledong Area, Yinggehai Basin

doi: 10.3799/dqkx.2019.176

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