Exploration, development, and construction in the Fuling national shale gas demonstration area in Chongqing: Progress and prospects

Geochemical characteristics and sedimentary environment of black mudstone in the early Carboniferous Dawuba Formation in the Middle and Upper Yangtze region

“…In marine sediments, the formation of black shale is a complex process, which is the result of the combined effects of terrigenous debris, hydrothermal sedimentation, biochemical processes, and other factors. The elements in rocks generally come from terrigenous detritus and the authigenic part of minerals, and the input of terrigenous detritus is a key factors affecting the mineral composition of black shale (Guo et al, 2023). Because the contents of A1 2 O 3 and TiO 2 are mainly related to the input of terrigenous materials, they are relatively stable and rarely affected by diagenesis and later geological processes (Roser and Korsch, 1986).…”

“…Natural gas resources account for a relatively large proportion of the energy structure of China, affecting the development and security of the country in key areas of economy, politics, security, etc (Guo et al, 2023;Zhang J. et al, 2023). With the vigorous development of unconventional petroleum in China, the exploration and development of shale gas in lower Paleozoic state in the Sichuan Basin has achieved remarkable results (Zhang et al, 2022;Zou et al, 2023).…”

Paleoenvironmental characteristics and organic matter enrichment mechanisms of the upper Ordovician-lower Silurian organic-rich black shales in the Yangtze foreland basin, South China

“…The increasing global energy demand and declining conventional oil and gas resources have emphasized the significance of developing unconventional gas reservoirs, such as shale gas, tight gas, and coalbed methane. The marine organic-rich black shales at the O 3 w-S 1 l 1 in the Sichuan Basin is considered the most promising layer for shale gas production and the primary target for shale gas commercial development in China (Zou et al, 2019;Yan et al, 2021;Guo et al, 2022). The extensive development of medium and large shale gas fields, including Weiyuan, Changning, and Fuling, has affirmed the immense exploration potential of shale gas reservoirs as "self-generated and selfstored" gas reservoirs (Liang et al, 2009;Nie et al, 2017;Qiu and Zou, 2020a;Ding et al, 2023;Feng et al, 2023).…”

Investigations on Supercritical Methane Adsorption and Storage in the Lower Longmaxi Shale of Nanchuan Area, Southeast Sichuan Basin

“…In the past decade, shale oil and gas reservoirs have attracted extensive attention from researchers from academic institutions and oil companies around the world. − Shale gas production in China exceeded 200 × 10 8 m 3 in 2020 and has been successfully exploited at the commercial level in the marine Ordovician Wufeng and Silurian Longmaxi shale reservoirs of the Sichuan Basin and its adjacent areas. , Many studies have noted that natural gas in shale reservoirs mainly occurs in three states: (1) free gas in nano- to micro-scale pore networks and microfractures; (2) adsorbed gas on the surface of OM and clay minerals (CM); and (3) dissolved gas in formation water or liquid hydrocarbons. ,, For postmature Longmaxi shale reservoirs (thermal maturity above 2.0%), free and adsorbed gas are generally regarded as the dominant components of shale gas accumulations, while dissolved gases could be considered negligible since almost no liquid hydrocarbons are present in these reservoirs, that is, the primary sites where dissolved gas occurs. In the two main components above, the proportion of adsorbed gas varies widely, typically accounting for 20–85 and 20–50% of the total shale gas capacity for typical shale gas reservoirs from North America and South China, respectively. ,, Thus, studies related to the adsorption of natural gas, that is, primarily methane, in shale reservoirs are extremely significant for reasonably estimating the economic efficiency of shale gas accumulations.…”

“…1−11 Shale gas production in China exceeded 200 × 10 8 m 3 in 2020 and has been successfully exploited at the commercial level in the marine Ordovician Wufeng and Silurian Longmaxi shale reservoirs of the Sichuan Basin and its adjacent areas. 12,13 Many studies have noted that natural gas in shale reservoirs mainly occurs in three states: (1) free gas in nano-to micro-scale pore networks and microfractures; (2) adsorbed gas on the surface of OM and clay minerals (CM); and (3) dissolved gas in formation water or liquid hydrocarbons. 1,14,15 For postmature Longmaxi shale reservoirs (thermal maturity above 2.0%), free and adsorbed gas are generally regarded as the dominant components of shale gas accumulations, while dissolved gases could be considered negligible since almost no liquid hydrocarbons are present in these reservoirs, that is, the primary sites where dissolved gas occurs.…”