松江盆地白垩系烃源岩地球化学特征及油源对比

doi:10.11743/ogg20180315

Abstract

Abstract: Two sets of Cretaceous source rocks,Dalazi and Changcai Formation,develop in the Songjiang Basin.In this study,we discussed the geochemical characteristics of source rocks and crude oil and the oil-source correlation based on the conventional organic geochemical analysis and biomarker compound test on Cretaceous source rocks and crude oil in the basin.The organic geochemical analysis indicates that Cretaceous source rocks are rich in organic matters,with the major organic matter being TypeⅡ₁-Ⅱ₂,and the source rock maturity ranges from low-mature to mature degree.And the Dalazi Formation has the greatest potential of hydrocarbon generation,followed by Changcai Formation.The analysis of biomarker compounds show that some of the Cretaceous source rocks and crude oil are subjected to a certain extent of biodegradation.Besides,source rocks of the Changcai Formation can be divided into three groups:the organic matters of source rock Group Ⅰ and Ⅱ are mainly from higher plants,which are deposited in partially oxidized fresh and brackish water,and source rock Group Ⅲ contains large amounts of gammacerane and β-carrotane,deposited in saline water.Source rocks of the Dalazi Formation are mainly deposited in reductive-brackish water environment,and their parent materials come from mixed sources.The oil-source correlation reveals that the crude oil generated from the Changcai Formation can be divided into two categories:the K₁c¹ oil originates from Group Ⅰ source rock and the K₁c² oil from the Group Ⅱ source rock of the source formation.Meanwhile,the reductive-prone oil from the Dalazi Formation originates from its K₁d²section.

Key words: biomarker, oil-source correlation, crude oil, source rock, Cretaceous, Songjiang Basin

CLC Number:

TE122.1

Zhou Jian, Shan Xuanlong, Hao Guoli, Zhao Rongsheng, Chen Peng. Geochemical characteristics of Cretaceous source rocks and oil-source correlation in the Songjiang Basin[J]. Oil & Gas Geology, 2018, 39(3): 578-586.

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Geochemical characteristics of Cretaceous source rocks and oil-source correlation in the Songjiang Basin

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