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    • Geochemical Behavior of Aliphatic Hydrocarbons During Primary Migration and Implication for Hydrocarbon Expulsion: A Case Study in Qikou Sag, Bohai Bay Basin, Eastern China

    Yongdong Zhang,Jianping Chen

    ORGANIC GEOCHEMISTRY（2022）

    South China Normal Univ

    Cited 0|Views6
    Abstract
    Lipid biomarker parameters and molecular carbon isotope compositions of n-alkanes were used as tracers to determine geochemical behavior of aliphatic hydrocarbons during their migration from two sequences of source rock-type mudstones (4050.8-4062.2 and 4067.4-4073 m depth, respectively) to the interbedded reservoir sandstones (4062.6-4066.3 m depth) in the Qikou Sag, Bohai Bay Basin, eastern China. Abnormally high values of the production index (0.69-0.90) and total extract/total organic carbon (TOC) ratios (0.53-1.21) in the sandstone samples indicated that the hydrocarbons in the sandstones were not produced in situ but migrated from the adjoining mudstones. A comparison of values in lipid biomarker parameters (oleanane index, gammacerane index, C23 tricyclic terpane/C30 alpha beta-hopane, and C29/C27 alpha alpha alpha 20R sterane ratios) in the sandstone with the mudstone samples indicated steroids and hopanoids in the upper section of the sandstone layer (4062.6-4065.2 m depth) were transported from the overlying mudstones, while those in the lower sandstone layer (4066.3 m depth) were transported from the underlying mudstones. Molecular carbon isotope data suggest that all n-alkanes in the upper section of the sandstone layer were transported from the overlying mudstones. However, in the lower sandstone layer, most of the C15-C17 n-alkanes were transported from the overlying mudstones, while the C18-C31 n-alkanes were transported mainly from the underlying mudstones. These combined results suggest the short-chain n-alkanes (C18) and steroids/hopanoids may have been expelled in a separate oil phase.
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    Key words
    Primary migration,Lipid biomarker,Molecular carbon isotope,Hydrocarbon expulsion,Qikou Sag,Bohai Bay Basin
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