Controlling Factors and Forming Types of Deep Shale Gas Enrichment in Sichuan Basin, China

Xuewen Shi, Wei Wu, Qiuzi Wu (), Kesu Zhong, Zhenxue Jiang and Huan Miao
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Xuewen Shi: Shale Gas Research Institute, Petro China Southwest Oil and Gasfield Company, Chengdu 610021, China
Wei Wu: Shale Gas Research Institute, Petro China Southwest Oil and Gasfield Company, Chengdu 610021, China
Qiuzi Wu: Shale Gas Research Institute, Petro China Southwest Oil and Gasfield Company, Chengdu 610021, China
Kesu Zhong: Shale Gas Research Institute, Petro China Southwest Oil and Gasfield Company, Chengdu 610021, China
Zhenxue Jiang: State Key Laboratory of Oil and Gas Resources and Exploration, Beijing 102249, China
Huan Miao: State Key Laboratory of Oil and Gas Resources and Exploration, Beijing 102249, China

Energies, 2022, vol. 15, issue 19, 1-19

Abstract: In order to find out the enrichment mechanism and forming type of deep shale gas, taking the Longmaxi Formation shale in the Desheng–Yunjin Syncline area of Sichuan Basin as an example, we determined the mineralogy, organic geochemistry, physical property analysis, gas and water content, and the influence of three factors, namely sedimentation, structural conditions, and hydrogeological conditions, on the enrichment of shale gas. The results show that Longmaxi Formation shale in Desheng–Yunjin Syncline area is a good hydrocarbon source rock that is in the over-mature stage and has the characteristics of high porosity, low permeability, and high-water saturation. The contents of clay and quartz are high, and the brittleness index is quite different. According to the mineral composition, nine types of lithofacies can be found. The development characteristics of Longmaxi Formation shale and the sealing property of the roof have no obvious influence on the enrichment of shale gas, but the tectonic activities and hydrodynamic conditions have obvious influence on the enrichment of shale gas. The main control factors for shale gas enrichment in different regions are different. According to the main control factors, the gas accumulation in the study area can be divided into three types: fault-controlled gas, anticline-controlled gas, and hydrodynamic-controlled gas. The fault-controlled gas type is distributed in the north of the Desheng syncline and the north of the Yunjin syncline, the anticline-controlled gas type is distributed in the south of the Desheng syncline and the south of the Yunjin syncline, and the hydrodynamic-controlled gas type is distributed in the middle of the Baozang syncline. This result is of great significance for deep shale gas exploration.

Keywords: Sichuan basin; deep shale gas; Longmaxi Formation; shale gas enrichment mechanism; forming type (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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