Residual carboxylic acids (nonpyrolytic) in mudstones and their implications and constraints on sandstone diagenesis, Bozhong Depression, offshore Bohai Bay Basin, East China,Organic Geochemistry

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Residual carboxylic acids (nonpyrolytic) in mudstones and their implications and constraints on sandstone diagenesis, Bozhong Depression, offshore Bohai Bay Basin, East China
Organic Geochemistry ( IF 2.6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.orggeochem.2020.104149
Huan Li , Qingbin Wang , Xiaofeng Du , Xianghua Yang , Hongtao Zhu

Abstract The residual carboxylic acids (nonpyrolytic) in mudstones were measured in Paleogene mudstones (0.60% The implications for sandstone diagenesis also are analysed. The predominant window of secondary porosity generation should generally be coeval with the hydrocarbon charge. Carboxylic acids transported from underlying mudstones and naphthenic acids/CO2 generated by hydrocarbon biodegradation are the main source of acids at shallow depths. Shallow depths have an injection time of carboxylic acids (including naphthenic acids/CO2) earlier than expected (∼0.30-0.35%Ro/11 Ma at shallow depths younger than ∼0.7%Ro/38 Ma at deep depths). These factors cause shallow and deep depths to have different diagenetic evolution paths. Therefore, it is inappropriate to use diagenetic models of shallow depths to predict the evolution of deep reservoirs.

更新日期：2021-01-01

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