Study on clay minerals in the Lower Silurian Longmaxi Formation in Southern Sichuan basin and its periphery

被引：0

作者：

Wang, Xiu-Ping ^{[1
,2
]}

Mou, Chuan-Long ^{[2
,3
]}

Ge, Xiang-Ying ^{[2
,3
]}

Chen, Xiao-Wei ^{[2
,3
]}

Zhou, Ken-Ken ^{[2
,3
]}

Wang, Qi-Yu ^{[2
,3
]}

Liang, Wei ^{[2
,3
]}

Chen, Chao ^{[2
,3
]}

机构：

[1] Shandong University of Science and Technology, Qingdao

[2] Key Laboratory Sedimentary Basins Oil and Gas Resources, Ministry of Land and Resources, Chengdu

[3] Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu

来源：

Natural Gas Geoscience | 2014年 / 25卷 / 11期

关键词：

Clay mineral; Distribution; Genesis; Longmaxi Formation; Shale gas; Southern Sichuan Basin and its periphery;

D O I：

10.11764/j.issn.1672-1926.2014.11.1781

中图分类号：

学科分类号：

摘要：

In order to investigate the physical characteristics of clay minerals in shale gas reservoir and their influence on the gas exploration and development, black shale from the Lower Silurian Longmaxi Formation in southern Sichuan Basin and its periphery were as studied. Based on X-diffraction analysis, combined with observation of thin sections and backscattered electron images, characteristics of clay minerals and their distribution were revealed. Chlorite+illite/smectite+illite is the main assemblage, including transformed and inherited types, which is dominated by illite, illite/smectite mixed layers and chlorite. The type and content of clay minerals have a certain meaning for sedimentary facies, for example, deep shelf facies have an average content of >50%, transitional facies are of <30%, and shallow shelf facies is between them. Longmaxi Formation had experienced arid-semiarid climate during sedimentation, burial water medium was saline and alkaline, and enriched in K+. The diagenetic evolution has reached the late diagenetic stage. In combination with the distribution characteristics of TOC, the area of Qijiang-Wulong-Pengshui in southeast of Chongqing, and Leibo-Junlian-Xingwen-Renhuai-Tongzi in west of Guizhou and north of Yunnan, as well as Xihe county in western Sichuan, are favorable for shale gas. The area of Yibin-Jiangjin-Fuling in Sichuan, is a secondary favorable zone. ©, 2014, Science Press. All right reserved.

引用

页码：1781 / 1794

页数：13

共 52 条

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