Affiliation:
1. Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
2. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
3. Geotechnical Engineering and Georisks Laboratory (LR14ES03), National Engineering School at Tunis, Université Tunis El Manar, Tunis 1068, Tunisia
Abstract
Against the backdrop of the national strategic goals of carbon peaking and carbon neutrality, the imperative for China’s low-carbon new energy transformation is evident. Emerging as an efficient and clean new energy source, the coal-based “three gases” (coalbed methane, tight sandstone gas, and shale gas) have gained prominence. Nevertheless, the current exploration of the coal-based “three gases” is limited to individual reservoirs, posing challenges to achieving overall extraction efficiency. The primary obstacle lies in the conspicuous disparities in gas content among different reservoirs, with the causes of such disparities remaining elusive. To address this issue, this study focused on the Permian Longtan Formation (coal, shale, and tight sandstone) in the southeastern Sichuan Basin. Through a comparative analysis of the mineral composition, organic geochemical features, and pore structure characteristics, this study aimed to delineate reservoir variations and establish a foundation for the simultaneous exploration and exploitation of the coal-based “three gases”. The research findings revealed that the differences in reservoir characteristics account for the variations in gas content among coal, shale, and tight sandstone. The mineral composition of the rock formations in the study area primarily consists of quartz, feldspar, clay minerals, pyrite, calcite, and dolomite. By comparison, the coal samples from the four major coal seams in the study area exhibited relatively large pore sizes, which are favorable for gas accumulation.
Funder
National Key Research and Development Program of China
the National Natural Science Foundation of China
Natural Science Foundation of Chongqing, China
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference48 articles.
1. Prediction of coal seam gas content based on the correlation between gas basic parameters and coal quality indexes;Dai;Front. Energy Res.,2023
2. Mechanical behaviors of coal measures and ground control technologies for China’s deep coal mines—A review;Kang;J. Rock Mech. Geotech. Eng.,2023
3. Liu, J., Bai, X., and Elsworth, D. (2024). Evolution of pore systems in low-maturity oil shales during thermal upgrading—Quantified by dynamic SEM and machine learning. Pet. Sci.
4. Organic Geochemical and Petrographic Characteristics of the Coal Measure Source Rocks of Pinghu Formation in the Xihu Sag of the East China Sea Shelf Basin: Implications for Coal Measure Gas Potential;Wang;Acta Geol. Sin.,2020
5. Comparison on Rare Gas Geochemical Characteristics and Gas Originations of Kuche and Southwestern Depressions in Tarim Basin, China;Wang;Geofluids,2019