Features of the first great shale gas field in China

Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

“…High gas production from the Longmaxi shale has been achieved at the Jiaoshiba area in the Fuling Block within the Sichuan Basin, making it the second commercial shale gas field outside North America (Guo and Liu, 2013;Li et al, 2014). The cumulative production reached 12.24 Â 10 8 m 3 by the end of 2014 (Liu, 2015). However, exploration of the Lonamaxi shale in the eastern area of Southeast Chongqing (outside the present day Sichuan Basin) has not made substantial progress, and all tested wells have a low gas yield.…”

Longmaxi shale gas geochemistry in Changning and Fuling gas fields, the Sichuan Basin

“…Carbon isotopic composition is also related to ethane Rayleigh Figure 11. Diagram distribution of d 13 C 1 and d 13 C 2 values of shale gases from Changning gas field (a, b), and Fuling gas field (c, d), Sichuan Basin (data sources: Dai et al, 2014aDai et al, , 2016aDai et al, , 2016cLiu, 2015;Wei et al, 2016).…”

“…This phenomenon is also observed for Lower Paleozoic Majiagou gas in western Jingbian in the Ordos Basin (Kong et al, 2016). Thomson, 1987;data sources: Dai et al, 2014adata sources: Dai et al, , 2016adata sources: Dai et al, , 2016cHill et al, 2007;Liu, 2015;Pashin et al, 2012;Stra poć et al, 2010;Tilley and Muehlenbachs, 2013;Wei et al, 2016;Wu et al, 2015;Zumberge et al, 2012). Figure 10 shows that data points of North American shale gas with relatively low maturity coincide with Schoell's maturity trend; carbon and hydrogen isotopes become heavy with maturity.…”

“…Isotopic variations with thermal maturity from To zone (with typical oil-asscociated gas) and Ms zone (with composition variations caused by shallow migration) to TT (m) zone (with dry oil-asscociated gas originating in marine sapropelic organic matter) are in agreement with kerogen types and thermal evolution. Tilley and Muehlenbachs, 2013;data sources: Dai et al, 2014adata sources: Dai et al, , 2016adata sources: Dai et al, , 2016cLiu, 2015;Wei et al, 2016). Figure 6.…”

“…After more than three periods of hydrocarbon generation and migration in the Longmaxi Formation in the Sichuan Basin, the d 13 C 1 value (À29.2% on the average) for Silurian gas Figure 10. Schoell plot of d 13 C 2 versus C 2 H 6 (a), d 13 C 1 versus CH 4 (b) of shale gases from North America and the Longmaxi shale gas of Sichuan Basin (modified after Burruss and Laughrey, 2010;Thomson, 1987;data sources: Dai et al, 2014adata sources: Dai et al, , 2016adata sources: Dai et al, , 2016cHill et al, 2007;Liu, 2015;Pashin et al, 2012;Stra poć et al, 2010;Tilley and Muehlenbachs, 2013;Wei et al, 2016;Wu et al, 2015;Zumberge et al, 2012).…”