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- W3024073914 abstract "In order to study the distributions of the biomarker of the continental source rocks in the Sichuan Basin, 71 source rock samples were collected from the Upper Triassic-Lower Jurassic strata in different regions. The n-alkanes, isoprenoids, terpane, sterane, sesquiterpenes, caranes and aromatics in the extracts were analyzed in detail. GC-MS analysis has been conducted to analyze the biomarker of the continental source rocks. The results of GC-MS analysis indicate that the Upper Triassic source rocks are high in the content of extended tricyclic terpanes, pristane, phytane, gammacerane, C 28 regular sterane and carotene. However, they are low in content of rearranged compounds. The ratio of Pr/Ph is less than 1, with the characteristics of tricyclic terpane C 21 > C 23 . The Lower Jurassic source rocks are extremely low in content (even zero) of extended tricyclic terpanes, pristane, phytane, gammacerane, C 28 regular sterane and carotene, and high in content of rearranged compounds. The ratio of Pr/Ph is more than 1, with tricyclic terpane C 21 > C 23 . These characteristics are still preserved after maturation. Moreover, during the sedimentation of the source rocks of T 3 x 2 –T 3 x 3 members, the supply of continental plants was low (TAR < 1, with regular sterane C 27 > C 29 , 1-MP/9-MP < 1). The source rocks of T 3 x 5 member were low in salinity (slightly low content of gammacerane and carotene), being different significantly from the other Upper Triassic source rocks. In addition, during the sedimentation of the source rocks of J1dn Member, the supply of continental plants was also low (regular sterane C 27 > C 29 , 1-MP/9-MP < 1), being quite different from that of J 1 l member. Through analysis of the difference in biomarkers, it is indicated that the sedimentary environment had changed from anoxic and brackish water during the Late Triassic to oxygen-rich and freshwater during the Early Jurassic in the Sichuan Basin. During this process, the types of organic matters had changed for several times." @default.
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- W3024073914 date "2020-05-12" @default.
- W3024073914 modified "2023-10-17" @default.
- W3024073914 title "Biomarker distributions and depositional environments of continental source rocks in Sichuan Basin, SW China" @default.
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- W3024073914 doi "https://doi.org/10.1177/0144598720915533" @default.
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