Relationship Between Electrical Properties and Sedimentary Environment of the Longmaxi Formation Shale, Southern Sichuan

• 作者: DENG Jixin HE Lanfang TANG Jialin WANG Pengwan WANG Xuben YANG Hongyu YANG Kai ZHANG Bing ZHANG Cong
• 来源期刊: 地质学报（英文版）
• 年，卷（期）: 2020,（5）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1531-1546
• 页数: 16页
• 语种: 英文

摘要

The Lower Silurian Longmaxi Formation in the south of Sichuan is a key player in the exploration and development of shale gas in China.Due to a highly complex topographic area,electromagnetic methods (EM) become important exploration means in this area.Many studies have been conducted on the shale mineral composition and electrical properties of shale,however,the correlation between sedimentary environments and the electrical properties of shale remain poorly understood.The electrical properties and sedimentary environment of the organic-rich shale of the Longmaxi Formation have been studied by means of X-ray diffraction,organic geochemistry,scanning electron microscopy and complex resistivity measurements.The discovered high quartz content of the Longmaxi Formation shale results in low resistivity.Deep-water shelf biogenic quartz contributes lower resistivity more than that of shallow-water terrigenous quartz.The deep-water anoxic and organic sedimentary environment led to major enrichment of pyrite,leading to a high polarization effect in shale.We present the correlation between the lithofacies types and electrical properties of Longmaxi Formation.The mixed siliceous shale lithofacies is the most favorable among the three lithofacies,which is characterized by high total organic carbon (TOC) content,high brittleness mineral content,high polarization and low resistivity (“three high and one low”).This feature is an effective identification of shale gas reservoirs by electromagnetic prospecting.Our study can provide constraints on electrical parameters of rocks for electromagnetic “sweet spot” exploration of shale gas,and so this has important geological significance to shale gas exploration and development.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	YANG Kai	中国科学院地质与地球物理研究所	1	0	0.0	0.0
2	ZHANG Bing	中国科学院地质与地球物理研究所	1	0	0.0	0.0
3	WANG Xuben	中国科学院地质与地球物理研究所	1	0	0.0	0.0
4	HE Lanfang	中国科学院地质与地球物理研究所	1	0	0.0	0.0
5	YANG Hongyu	中国科学院地质与地球物理研究所	1	0	0.0	0.0
6	WANG Pengwan	中国科学院地质与地球物理研究所	1	0	0.0	0.0
7	TANG Jialin	中国科学院地质与地球物理研究所	1	0	0.0	0.0
8	DENG Jixin	中国科学院地质与地球物理研究所	1	0	0.0	0.0
9	ZHANG Cong	中国科学院地质与地球物理研究所	1	0	0.0	0.0