Geochemistry and origin of the giant Quaternary shallow gas accumulations in the eastern Qaidam Basin, NW China

Maturity effect on carbazole distributions in source rocks from the saline lacustrine settings, the western Qaidam Basin, NW China

“…Three oil-gas systems were discovered in the three areas respectively, i.e. the Jurassic freshwater lacustrine oil system in the north (Ritts et al, 1999), the Tertiary saline lacustrine petroleum system in the west (Hanson et al, 2001) and the Quaternary biogenetic gas system in the east (Pang et al, 2005). Major petroleum accumulations were discovered in the Tertiary petroleum system located in the western part of the basin, the western Qaidam Basin (Zhu et al, 2005).…”

Geochemical evidence for strong ongoing methanogenesis in Sanhu region of Qaidam Basin

“…The characteristics of methane from producing formation in this region are as follows: The stable carbon isotope ratio is mostly below −60‰, and the stable hydrogen isotope ratio is at −210‰-−230‰ [13,14]. These characteristics are consistent with those of methane from headspace gases, and demonstrate biogenic origin [1,5,11,15,16].…”

Geology of giant gas fields in China

“…The Yulin gas field in the Ordos Basin is such an 1959 1960 1961 1962 1963 1964 1965 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 hypersaline lacustrine biogenic gas kitchen in the Qigequan Formation, within the gas-generating intensity contours around 3.0-3.5 bcm/km 2 ( Fig. 6; Pang et al, 2005). Similar observations have been made in northern West Siberian Basin in Russia, where the world's largest gas fields are reportedly associated with the intra-reservoir gas-generating centers in the Cenomanian coal measures (Nesterov et al, 1975;Vasil'ev, 1983).…”