准噶尔盆地玛湖凹陷二叠系烃源岩三环萜烷分布样式及影响因素

doi:10.11743/ogg20170211

Abstract

Abstract: Biomarkers extracted from the crude oil and source rock samples obtained from the northwestern margin of Junggar Basin are characterized by high abundance of tricyclic terpanes (TTs).The distribution pattern of TTs has been used to distinguish oil families and to conduct oil-source correlations.Comprehensive geochemical analyses of source rock samples reveal that different distribution patterns of TTs correspond to different sets of source rocks,i.e.the Fengcheng Formation(P₁f) features in "Going Up" of C₂₀,C₂₁ and C₂₃ TTs,with higher amounts of C₂₄ and C₂₅ TTs for mudstones in comparison with carbonate rocks;the Lower Wuerhe Formation(P₂w)and the Jiamuhe Formation(P₁j)are characterized by "Going Down" of C₂₀,C₂₁ and C₂₃ TTs.The influences of sedimentary environment,kerogen type,maturity and hydrocarbon expulsion on distribution of TTs were studied through microscopic observation of thin sections and hydrous pyrolysis simulation.We concluded that the TTs distribution patterns of P₁f and P₂w are mainly controlled by sedimentary environment and kerogen type.The organic matters of the P₁f source rocks were mainly derived from autochthonous algae or bacteria and were deposited in an evaporative reducing salt lake,while allochthonous organic matters were relatively abundant in the P₂w and were deposited in a semi-reducing fresh lacustrine environment.The P₁j source rocks are currently over-mature and have experienced intense carbonization.Burial thermal evolution has limited impacts on the distribution patterns of TTs during mature and high-mature stage,but can result in the increase of low carbon number terpanes during over-mature stage.Hydrocarbon expulsion has limited influences on the TTs distribution pattern.

Key words: tricyclic terpanes, biomarkers, hydrou pyrolysis, Permian source rock, Mahu Depression, Junggar Basin

CLC Number:

TE122.1

Chen Zhelong, Liu Guangdi, Wei Yanzhao, Gao Gang, Ren Jiangling, Yang Fan, Ma Wanyun. Distribution pattern of tricyclic terpanes and its influencing factors in the Permian source rocks from Mahu Depression in the Junggar Basin[J]. Oil & Gas Geology, 2017, 38(2): 311-322.

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Distribution pattern of tricyclic terpanes and its influencing factors in the Permian source rocks from Mahu Depression in the Junggar Basin

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