Abstract
Gas exploration has made major breakthrough firstly in Devonian strata in northwest Sichuan Basin, and its natural gas source have attracted much attention. In this work we developed comprehensive researches on natural gas geochemistry, reservoir bitumen and related source rock biomarkers of Devonian. Result shows: Natural gas in Devonian is secondary cracking gas dominated by hydrocarbon gas. It is major in sapropel type gas and comes from the source rock of Qiongzhusi Formation of Lower Cambrian and Middle Permian, mainly from the former. There are two reservoir accumulation model for gas in Devonian: lower source to upper reservoir and upper source to lower reservoir. Result is of important guidance significance for the exploration deployment of natural gas in this area.
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