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Natural gases from the Sichuan Basin, China were analyzed to investigate helium abundances and isotopic composition in order to assess crustal vs. mantle inputs into the Sinian to Jurassic gas reservoirs that occur at depths up to 4900m. In general, gases from the Sinian and pre-Sinian strata in south Sichuan have relatively high abundances of helium compared to those from the east, central and west...
Coal-derived, large scale gas fields derived from the Mesozoic coal measures in China are mainly distributed in the Middle–Lower Jurassic coal measures in the Tarim, Junggar and Turpan-Hami basins in northwest China, and the Upper Triassic Xujiahe Formation coal measure in Sichuan Basin, central China. In 2011, the annual production was 21.6×10 9 m 3 and the proved geological reserves...
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