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《Geochimica》 2012-02
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Kinetics of hydrocarbon generation in open system of kerogen in the Pingliang Shale,Ordos Basin

JIANG Lin-xiang1,2,WANG Qing-tao1,2,LU Hong1,LIU Jin-zhong1 and PENG Ping-an1 1.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China  
The hydrocarbon generation characteristics of marine shale kerogen from the Middle Ordovician Ping-Liang Formation were studied in this paper by simulation experiments based on Rock-Eval pyrolysis at three different heating rates.Combined with the patent software(Kinetics),variation in the yield of thermally generated hydrocarbon(S2) with pyrolysis temperature was used to calculate the kinetic parameters of petroleum generation in open system.The calculated activation energies are in the range of(57~81)×4.185 kJ/mol.The result of kinetic simulation is in agreement with the experimental data,indicating that experimental results can be extrapolated to actual geological process.In addition,H/C atomic ratios of the pyrolysis residues show good correlations with pyrolysis temperature,kerogen conversion,and thermal maturity.Therefore,source rock parameters,such as thermal maturity,hydrocarbon conversion rate,and hydrocarbon generated amount,can be quickly evaluated by the combination of Rock-Eval pyrolysis and H/C ratio determination of kerogen.
【Fund】: 国家重点基础研究发展计划(2012CB214706);; 国家科技重大专项(2011ZX05008-002-33);; 国家自然科学基金(40873048 41173053)
【CateGory Index】: P618.13
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