Evaluation of Marine Shale Gas Reservoir in Wufeng–Longmaxi Formation, Jiaoshiba Area, Eastern Sichuan Basin

Qiang Yan (), Aiwei Zheng, Li Liu, Jin Wang, Xiaohong Zhan and Zhiheng Shu
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Qiang Yan: Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430233, China
Aiwei Zheng: Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430233, China
Li Liu: Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430233, China
Jin Wang: Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430233, China
Xiaohong Zhan: Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430233, China
Zhiheng Shu: Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430233, China

Energies, 2025, vol. 18, issue 16, 1-14

Abstract: The Jiaoshiba area, as an important production capacity contribution block for the Fuling shale gas field, is of great significance for its long-term stable production. This study is based on continuous coring, and uses methods such as whole-rock mineral analysis, porosity and permeability analysis, gas content analysis, and organic geochemistry to systematically analyze the influencing factors of reservoir properties and gas content in the studied interval. Combined with the variation law of TOC and other parameters with depth, the target reservoir is comprehensively evaluated, and the evaluation results are verified based on actual production data. The results show that the influence of minerals on permeability is very weak, and cracks can greatly improve permeability, but their contribution to porosity is not significant. Porosity has a certain impact on gas content, but it is not the main controlling factor. The pores related to quartz (organic silicon) are mostly organic pores, which host a large amount of shale gas, while clay minerals are not conducive to the occurrence of shale gas. Organic matter (OM) maturity contributes more to porosity than OM abundance, but OM abundance has a stronger impact on gas content than its maturity. The research intervals can be divided into four categories: Class I (①–③) is the best, followed by Class II (⑦–⑨); Class III (④–⑥) is poor, and Class IV (top, non-gas-bearing layer) is the worst.

Keywords: Jiaoshiba area; Wufeng-Longmaxi formation; marine shale gas; reservoir evaluation; gas bearing capacity (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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