New Discoveries and Exploration Significance of Permian Shale Gas Investigation in the Hefeng Area, Western Hubei Province

LI Hai; ZHANG Bao-Min; CHEN Lin; LI Xu-Bing; WANG Jie; ZHANG Xiao-Tao; QIN Wei-Bing

doi:10.3969/j.issn.2097-0013.2025.01.010

2025 Vol. 41, No. 1

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Article navigation > South China Geology > 2025 > 41(1): 126-135

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LI Hai, ZHANG Bao-Min, CHEN Lin, LI Xu-Bing, WANG Jie, ZHANG Xiao-Tao, QIN Wei-Bing. 2025. New Discoveries and Exploration Significance of Permian Shale Gas Investigation in the Hefeng Area, Western Hubei Province. South China Geology, 41(1): 126-135. doi: 10.3969/j.issn.2097-0013.2025.01.010

Citation:

LI Hai, ZHANG Bao-Min, CHEN Lin, LI Xu-Bing, WANG Jie, ZHANG Xiao-Tao, QIN Wei-Bing. 2025. New Discoveries and Exploration Significance of Permian Shale Gas Investigation in the Hefeng Area, Western Hubei Province. South China Geology, 41(1): 126-135. doi: 10.3969/j.issn.2097-0013.2025.01.010

New Discoveries and Exploration Significance of Permian Shale Gas Investigation in the Hefeng Area, Western Hubei Province

1.
Wuhan Center, China Geological Survey (Geosciences Innovation Center of Central South China), Wuhan 430205, Hubei, China
2.
Shale Gas Research Center in Complex Structural Area of South China, Wuhan 430205, Hubei, China
3.
Technology Innovation Center for Shale oil and Gas Accumulation Theory and Engineering in Southern Complex Structural Area, Wuhan 430205, Hubei, China
4.
Changsha General Survey of Natural Resources Center, China Geological Survey, Changsha 410600, Hunan, China
5.
National Research Center for Geoanalysis, Beijing 100037, China
6.
River Basin Hub Operation Management Center, China Three Gorges Corporation, Yichang 443133, Hubei, China

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Corresponding author: ZHANG Bao-Min, zhangbaomin@mail.cgs.gov.cn

Received Date: 20 December 2024

Revised Date: 09 February 2025

Publish Date: 20 March 2025

Abstract

Abstract

Based on the review of oil and gas exit block data, field geological survey, and comprehensive research in the Hefeng area of western Hubei, the Hefeng syncline was carried out to implement well EHY3. Through on-site desorption test as well as analysis of organic carbon content (TOC), vitrinite reflectance (Ro) and X-ray diffraction mineral content, the geological conditions for shale gas accumulation in the Permian Dalong Formation were preliminarily revealed. The results showed that in the Permian Dalong Formation organic-rich shale was developed with average organic carbon content of 6.38%, the high-quality shale thickness over 30 m, and the main type of organic matter is type I, with average vitrinite reflectance (Ro) of 2.14%, indicating good material conditions for hydrocarbon generation. The minerals in shale are characterized by high silicon (quartz content average 58.4%) and low calcium (carbonate mineral content average 14.9%), with an average brittle mineral content of 84.1%. The reservoir has good conditions for later fracturing and transformation. The average gas content of the Dalong Formation shale on-site desorption tested is 1.38 m³/t, and the favorable gas bearing shale section in the lower 20.5 m has an average of 1.73 m³/t. The methane gas accounts for an average of 97.9% of the desorption gas, which indicating the Dalong formation shale has good gas bearing properties. The first time Permian shale gas survey in well EHY3 from the Hefeng syncline further expanded the favorable shale gas areas of the Permian Dalong Formation in western Hubei to the south. This discovery simultaneously indicated that structural preservation conditions are the main controlling factors for shale gas accumulation and enrichment, and the relatively weak deformation zones in the complex tectonic area can form favorable shale gas structural preservation styles, which indicates an important direction for shale gas exploration.
- well EHY3 /
- Permian Dalong Formation /
- shale gas /
- new discoveries /
- the Hefeng area in western Hubei

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