湖相页岩有机储集空间发育特点与成因机制

张林晔; 李钜源; 李政; 朱日房; 张守春; 刘庆; 张金功; 陈中红

doi:10.3799/dqkx.2015.163

Volume 40 Issue 11

Nov. 2015

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Article Navigation > Earth Science > 2015 > 40(11): 1824-1833

Zhang Linye, Li Juyuan, Li Zheng, Zhu Rifang, Zhang Shouchun, Liu Qing, Zhang Jingong, Chen Zhonghong, 2015. Development Characteristics and Formation Mechanism of Intra-Organic Reservoir Space in Lacustrine Shales. Earth Science, 40(11): 1824-1833. doi: 10.3799/dqkx.2015.163

Citation:

Zhang Linye, Li Juyuan, Li Zheng, Zhu Rifang, Zhang Shouchun, Liu Qing, Zhang Jingong, Chen Zhonghong, 2015. Development Characteristics and Formation Mechanism of Intra-Organic Reservoir Space in Lacustrine Shales. Earth Science, 40(11): 1824-1833. doi: 10.3799/dqkx.2015.163

Citation:

Zhang Linye, Li Juyuan, Li Zheng, Zhu Rifang, Zhang Shouchun, Liu Qing, Zhang Jingong, Chen Zhonghong, 2015. Development Characteristics and Formation Mechanism of Intra-Organic Reservoir Space in Lacustrine Shales. Earth Science, 40(11): 1824-1833. doi: 10.3799/dqkx.2015.163

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Development Characteristics and Formation Mechanism of Intra-Organic Reservoir Space in Lacustrine Shales

doi: 10.3799/dqkx.2015.163

1.
Geological Scientific Research Institute, Shengli Oil Field Branch Company, SINOPEC, Dongying 257015, China
2.
State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
4.
School of Geosciences, China University of Petroleum, Qingdao 266580, China

Received Date: 2015-07-02
Publish Date: 2015-11-15

Abstract

Abstract

Organic reservoir is one of the important reservoir types in shale. The development of organic reservoir space in lacustrine shales within oil window is lack of research work. In view of this, lacustrine shale samples with different maturities in oil window were selected and prepared by argon ion-milling techniques. Joint Quanta200 scanning electron microscope and EDAX energy spectrometer, and JSM-6700f field emission scanning electron microscope were employed to observe the microstructure and analyze the composition of lacustrine shales. Both back scattered images and secondary electronic images show that abundant mixtures of dark banded organic matter (OM)-clay-carbonate and OM-clay-sulfate were developed in shales. Pores were easily developed in the mixtures. From 2 500 m to 4 000 m, the pores continuously exist. At the depths less than 3 600 m, the pore size generally occurs on micron scale. With the continued evolution, nano pores increase and are densely distributed. The intra-pores in the mixtures are synchronous with the rapid increasing of oil saturation and the rising of free organic acids in shales, respectively. The development of the pores not only depends on the hydrocarbon generation, but also on the interaction of hydrocarbon conversion and the organic acid dissolution. The results indicate that in lacustrine shales within oil window, organic matter and inorganic minerals undergo evolution as a whole and interact with each other. The combination of hydrocarbon generation and dissolution form abundant reservoir space in the hybrid of organic matter and minerals, which has important significance to the occurrence of oil and gas in continental shales.
- lacustrine shale,
- oil window,
- organic reservoir space,
- organic acid,
- formation mechanism,
- petroleum geology.

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Development Characteristics and Formation Mechanism of Intra-Organic Reservoir Space in Lacustrine Shales

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