Abstract
Adsorbed gas is an important component of shale gas. The methane adsorption capacity of shale determines the composition of shale gas. In this study, the methane adsorption capacity of marine, transitional, and lacustrine shales in the Sichuan Basin was analyzed through its isothermal adsorption, mineral composition, water content, etc. The results show that the methane adsorption capacity of marine (Qiongzhusi Formation and Longmaxi Formation), transitional (Longtan Formation), and lacustrine (Xujiahe Formation and Ziliujing Formation) shales is significantly different. The Longtan Formation has the strongest methane adsorption capacity. This is primarily related to its high organic matter and organic matter type III content. The methane adsorption capacity of the lacustrine shale was the weakest. This is primarily related to the low thermal evolution degree and the high content of water-bearing clay minerals. Smectite has the highest methane adsorption capacity of the clay minerals, due to its crystal structure. The water content has a significant effect on methane adsorption largely because water molecules occupy the adsorption site. Additionally, the temperature and pressure in a specific range significantly affect methane adsorption capacity.
Highlights
As a clean fossil resource, natural gas has always been an important energy source for the world’s industrial and economic development
The weight change recorded by the magnetic levitation balance was used to obtain the mass of methane gas, calculate the shale adsorption characteristic parameters according to the Langmuir theoretical model, and draw the adsorption isotherm curve
The marine shale is dominated by dark shale, and its minerals are primarily quartz, clay, carbonate minerals, and other types of minerals
Summary
As a clean fossil resource, natural gas has always been an important energy source for the world’s industrial and economic development. As one of the important types of natural gas, shale gas is an abundant resource, and the shale revolution has changed the global oil and gas supply [1,2,3]. North America and China are the primary regions of commercial shale gas development. In 2019, the production of shale gas in the United States reached 7151 × 108 m3, accounting for 62.0% of the total gas production, the highest production in North America. China’s shale gas production reached 154 × 108 m3 in 2019. The Sichuan Basin is an important petroliferous basin where China’s shale gas exploration and development has made the most rapid progress and the earliest commercial development [4, 5]
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