Abstract
ABSTRACTThe analysis on natural gas, light hydrocarbons and biomarkers, and comparison with periphery structures by the whole hydrocarbon geochemistry has been made to figure out controversial Dinan Cretaceous source. The oil, similar to Dongdao-3 reservoir extracts but different from Kelameili oil, is characterized by light carbon isotope, small light-hydrocarbon value, high methyl cyclohexane but low C28 sterane abundance, while natural gas differs in components and carbon isotopes from typical Carboniferous gas. Moreover, both Dinan Cretaceous oil and gas are sourced from Dongdaohaizi sag where crude oil is generated from Permian and Jurassic maturation while gas is from Carboniferous high-over maturation and Permian maturation.
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