The Fractured Permian Reservoir and Its Significance in the Gas Exploitation in the Sichuan Basin, China

Xin Luo, Siqi Chen, Jiawei Liu, Fei Li, Liang Feng, Siyao Li, Yonghong Wu, Guanghui Wu () and Bin Luo ()
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Xin Luo: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Siqi Chen: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Jiawei Liu: School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Fei Li: PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China
Liang Feng: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Siyao Li: School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Yonghong Wu: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Guanghui Wu: School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Bin Luo: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China

Energies, 2023, vol. 16, issue 4, 1-13

Abstract: Large gas reserves have been found in the Permian platform margin of the Kaijiang-Liangping area of the Sichuan Basin in SW China. They are assumed to be a widely developed reef–shoal reservoir. However, the tight matrix reservoir cannot support high gas production using conventional development technology at deep subsurface. In this contribution, we analyze the fractured reservoirs along the strike-slip fault zones using the compiled data of cores, well logging, and production data, and provide a seismic description. It was shown that the fractures and their dissolution developed along the strike-slip fault zones. The porosity and permeability of the fractured reservoir could increase by more than one and 1–2 orders of magnitude, respectively. The seismic anisotropic energy found in the steerable pyramid process suggests that fractured reservoirs have a strong heterogeneity, with a localized fault damage zone. This fracturing has both positive and negative effects, showing varied reservoir parameters in the fault damage zone. The development pattern should adopt a non-uniform well pattern, in order to target the localized “sweet spot” of the fractures in these deep tight matrix reservoirs.

Keywords: tight matrix reservoir; strike-slip fault; fractured reservoir; seismic reservoir description; deep gas exploitation; Sichuan basin (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: 2023
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