LAUSR

Little research regarding the organic geochemistry of source rock deposited in marine or transitional environment in the eastern deep-water area of the Qiongdongnan Basin (QDNB) has been performed so far. Based on the organic geochemical and petrological data of mudstone samples collected from the eastern deep-water area in the QDNB, combined with palynological data of rock samples in the shallow-water area, this paper studies the paleoenvironment, hydrocarbon potential, and controlling factors of Oligocene source rock in different sedimentary facies in the eastern QDNB. Two distinct models of delta front source rock and neritic source rock are proposedaccording to organic matter sources and geochemical characteristics. Source rock in the delta front subface is of medium to high organic abundance and gas-prone-type kerogen, the geochemical biomarkers are characterized by high ratios of pristane/phytane, oleanane/C30 hopane, T-bicadinane/C30 hopane, and low ratios of C23 tricyclic terpane/C30 hopane, C27 s...