Carbon isotopic composition and genetic types of natural gas in the Sichuan Basin, China

Peng, Jinning; Wang, Dongyan; Liu, Guangxiang; Zhang, Min; Li, Fengli

doi:10.1007/s11631-016-0134-2

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…The evolution of the Sichuan Basin goes through five stages, namely, the Presinian basement formation stage, the Sinian-Middle Triassic kratogen basin stage, the Late Triassic foreland basin stage, the Early Jurassic-Late Cretaceous depression basin stage, and the Cenozoic tectonic basin stage (Figure 2). The Sinian-Middle Triassic is dominated by platform-type marine carbonate rocks, interbedded with transitional facies argillaceous sediments, with a thickness of 4000-6000 m. After the Indosinian period, seawater exited the area resulting in a terrestrial environment [25]. The basin began to enter the foreland and depression stages.…”

Section: Geological Settingmentioning

confidence: 99%

Characteristics and Origin of Methane Adsorption Capacity of Marine, Transitional, and Lacustrine Shales in Sichuan Basin, China

Tang

Wu²,

Zhong³

et al. 2021

Geofluids

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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.

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Section: Geological Settingmentioning

confidence: 99%