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ABSTRACT
The aim of this paper is to analyze natural gas, light hydrocarbons, and biomarkers by the whole hydrocarbon geochemistry to figure out controversial source of Cainan oilfield. Dry gas and oil reservoirs in Baijiahai suggest multi-stage accumulation of mature and high-over mature gas from widely distributed methane carbon isotope and humic, which are products of heavy ethane carbon isotope. The natural gas in Fubei slope area is typical mature wet gas. According to regional structural and evolution features, high-over mature gas in Baijiahai originates from Carboniferous source rocks of Dongdaohaizi sag, while mature crude oil is a mixture of Jurassic and Pingdiquan formation of Permian.
Funding
The funding for this research was supported by the National key Scientific and Technological project (2016ZX05007003—007) and Southwest Petroleum University funding plan of oil and gas accumulation geochemistry for Youth Science and technology innovation team (No.2015CXTD02).