Comparison of Enrichment Characteristics of Typical Normally-Pressured Shale Gas Reservoirs in Lower Silurian Shale in Southeastern Sichuan Basin and Devonian Shales in Appalachian Basin

被引：0
|
作者：
Jiang S. [1 ,2 ]
Zhang T. [1 ,2 ]
Guo T. [3 ]
He X. [4 ]
Gao Y. [4 ]
Xue G. [4 ]
Zhang P. [4 ]
Chen G. [3 ]
机构：
[1] Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan
[2] School of Earth Resources, China University of Geosciences, Wuhan
[3] SINOPEC Southwest Oil & Gas Company, Chengdu
[4] SINOPEC East China Oil & Gas Company, Nanjing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 01期
关键词：
gas bearing difference; normally pressured shale gas; petroleum geology; reservoir geochemistry difference; sedimentary and tectonic difference; shale gas enrichment difference;
D O I：
10.3799/dqkx.2022.356
中图分类号：
学科分类号：
摘要：
After continuous research in various countries, overpressured shale gas has been commercially developed in most countries, but normally-pressured shale gas has only been commercially developed in the United States. In order to overcome the current situation of China’s high external dependence on natural gas, the commercial development of normally-pressured shale gas will play significant role to fulfill the demand in natural gas. It is urgent to study its enrichment characteristics, which may provide guidance for the formulation of development plans. This study starts from the tectonic & sedimentary evolution of typical normally-pressured shale gas reservoirs in the Lower Silurian shale of Sichuan Basin and Devonian shales of the Appalachian Basin. Then, the differences in reservoir geochemistry and shale gas occurrence characteristics are analyzed. Finally, the paper conducts the comparion analyses in the enrichment of normally-pressured shale gas reservoirs in China and the United States. Compared to the Appalachian Devonian Marcellus shale and Ohio shale with simple structural deformation, rich type II-III kerogen, high gas-bearing porosity and far away from outcrop, the Lower Silurian Wufeng-Longmaxi Formation shale layer in southeastern Sichuan is rich in high-mature type I kerogen, and has undergone multiple stages of complex tectonic movement. This means that underlain formation is more structurally-deformed, the formation dip angle is larger, and the shale gas is easy to migrate to the underlain fractured rock and outcrop area to leak, so its gas content is slightly lower than that of Marcellus shale. But for the Ohio shale, even though which has low gas content and low enrichment, it is easier to reach industrial gas flow by depressurization due to its shallow burial and low temperature and pressure. © 2023 China University of Geosciences. All rights reserved.
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页码：77 / 91
页数：14
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