Surface outcrops of Jurassic marine strata in the Shenglihe area of the Qiangtang Basin contain a large amount of petroleum.Previous research indicated the presence of multiple petroleum systems with complex properties.Based on previous research,the main research objects of this study were the petroleum display of the central oil shale outcrop,exploration well core,and surface oil and gas display of the Middle Jurassic Buqu Formation(J2b).Through TOC analysis,rock pyrolysis,saturated hydrocarbon chromatography,and saturated hydrocarbon chromatography-mass spectrometry,the source rock types and oil sources in the Shenglihe area were studied in detail,providing a theoretical basis for further petroleum exploration.The results show that the organic matter within the J2b middle stratum was primarily Type II,which has a high potential for oil generation.The oil predominantly originates from reduced marine sedimentary environments.The organic matter input of the samples in the study area was mainly lower aquatic organisms;DB4142 was mixed with lower aquatic organisms and higher plants;and BD4902 mainly contained higher plants.The oil reached maturity,as evidenced by 25-norholane series compounds in all the samples,suggesting a history of significant biodegradation.Using cluster analysis based on fingerprint and biomarker parameter characteristics,we classified the oil into four categories:A,B,C,and D.Class A oil mainly comes from the source rocks of the same horizon(J2b),whereas Classes B,C,and D exhibit little to no contribution from the J2b source rocks and may come from other horizon source rocks.
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