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- W2589953178 abstract "ABSTRACT This study analyzed crude oils from the lower part of the third member of the Eocene Shahejie Formation (Es 3 L ) and three prospective source rocks from the Shulu sag, Bohai Bay basin, eastern China, using a variety of organic geochemical methods. Biomarker characteristics were used to interpret source rock organic matter input and depositional environment, and oil–source rock correlation. The biomarker data indicate that the crude oils originated from the Es 3 L source rock, which contains a mixture of plankton and land plant organic matters deposited in brackish–fresh water under reducing conditions. The oil in the Es 3 L is self-sourced instead of migrated from the overlying source rocks. The petroleum generation potential of the Es 3 L source rock was evaluated using organic geochemistry. Total organic carbon (TOC) values for approximately 100 samples are between 1.02 and 4.92 wt. %, and hydrogen indices range from 285 to 810 mg hydrocarbons/g TOC. The Es 3 L source rock contains mainly type II and III kerogen, and most of the samples are thermally mature. The data show that the Es 3 L source rock has good potential for liquid hydrocarbon generation. The Es 3 L rock also acts as the oil reservoir, having very low bulk porosity and permeability. Various types of storage space in the marlstone and carbonate rudstone in the Es 3 L of the Shulu sag include (1) fractures, (2) intergranular pores, (3) dissolution pores, (4) organic matter pores, (5) intragranular pores, and (6) seams around gravels. Pore size ranges from nanometers to millimeters. Because the oil was generated and stored in Es 3 L strata, which lack any obvious trap and seal and have low permeability, the unit represents a continuous petroleum accumulation." @default.
- W2589953178 created "2017-03-03" @default.
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- W2589953178 date "2017-11-01" @default.
- W2589953178 modified "2023-10-01" @default.
- W2589953178 title "A type of continuous petroleum accumulation system in the Shulu sag, Bohai Bay basin, eastern China" @default.
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- W2589953178 doi "https://doi.org/10.1306/01251715073" @default.
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