Tight Sandstone Gas Reservoir Types and Formation Mechanisms in the Second Member of the Xujiahe Formation in the Anyue Area, Sichuan Basin

Lin Jiang, Xuezhen Sun, Dongxia Chen (), Wenzhi Lei, Hanxuan Yang, Yani Deng, Zhenhua Wang, Chenghai Li, Tian Liu, Chao Geng, Tian Gao and Zhipeng Ou
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Lin Jiang: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Xuezhen Sun: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Dongxia Chen: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Wenzhi Lei: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Hanxuan Yang: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Yani Deng: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Zhenhua Wang: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Chenghai Li: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Tian Liu: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Chao Geng: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China
Tian Gao: State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Zhipeng Ou: Shunan Gas Mine, Southwest Oil and Gas Field Company, PetroChina, Luzhou 646000, China

Energies, 2025, vol. 18, issue 12, 1-36

Abstract: With the advancement of oil and gas exploration and development, tight sandstone gas has become a major current exploration field. However, the effective development of tight sandstone gas faces significant challenges due to the strong heterogeneity of tight sandstone reservoirs, diverse reservoir types, complex pore structures, and unclear understanding of reservoir formation mechanisms, which brings great difficulties. Clarifying the types and formation mechanisms of tight sandstone reservoirs is vital for guiding oil and gas exploration and development. This study investigates the characteristics, types, and formation mechanisms of tight sandstone gas reservoirs in the Xujiahe Formation (T 3 X 2 ) of the Anyue area using core observation, cast thin-section identification, scanning electron microscopy, high pressure mercury intrusion, nuclear magnetic resonance, and other experimental methods. It defines the physical property lower limit of T 3 X 2 reservoirs in Anyue, classifies reservoir types, elaborates on the basic characteristics of each type, and analyzes their genetic mechanisms. The results show that T 3 X 2 reservoirs in the Anyue area can be divided into four types. Sedimentary, diagenetic, and tectonic processes are identified as the primary factors controlling reservoir quality, governing the formation mechanisms of different reservoir types. Based on these findings, a reservoir formation mechanism model for T 3 X 2 reservoirs in the Anyue area is established, providing an important basis for subsequent oil and gas exploration and development in the region.

Keywords: T 3 X 2 in Anyue area; tight sandstone; reservoir classification; reservoir formation mechanism; formation model (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: 2025
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