Geochemical Significance and Distribution Characterisitics of Polycyclic AromaticHydrocarbons from the Jurassic Source Rocks in the Heshituoluogai Basin,Northwest Junggar

LIU Hong-jun，QIN Li-ming，ZHANG Zhi-huan

doi:10.11764/j.issn.1672-1926.2012.06.1104

2012 , Vol. 23 >Issue 6: 1104 - 1115

DOI: https://doi.org/10.11764/j.issn.1672-1926.2012.06.1104

Geochemical Significance and Distribution Characterisitics of Polycyclic AromaticHydrocarbons from the Jurassic Source Rocks in the Heshituoluogai Basin,Northwest Junggar

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1.School of Oil and Gas Source of Xi′an Shiyou University,Xi′an,710065,China;
2.SINOPEC Research Institute of Petroleum Engineering,Beijing 100101,China;
3.State Key Laboratory for Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China

Received date: 2012-03-18

Revised date: 2012-07-11

Online published: 2012-12-10

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Abstract

According to the GC-MS analysis and identification of aromatic hydrocarbon,the distribution of aromatic hydrocarbons is investigated.The results indicate that the distribution of aromatic hydrocarbons is extensive from dinuclear aromatics to heptacyclic aromatics.The relative abundance of tetracyclic and pentacyclic aromatics is apparently higher than that of dinuclear and tricyclic aromatics in Jurassic source rocks.The distribution of PAH in mudstone and coal is easily affected by the sedimentary facies.The relative content of phenanthrene,fluoranthene,pyrene,chrysene,benzofluoranthene and benzo[e]pyrene is higher than other compounds in the mudstone from Badaowan Formation,but in Xishanyao Formation,the content of perylene is predominantly higher.In Sangonghe Formation,the content is high.However,in the coal from Badaowan Formation,the content of them is high,but in the coal from Xishanyao Formation,the content of benzofluoranthene,benzo[e]pyrene and benzo[a]pyrene is high and other compounds is low.Additionally,retene exits in Jurassic rock and its content is moderate.The parameters of alkyl naphthalene and dibenzothiophene reflecting maturity changes greatly,indicating that the indexes of coal is higher than mudstones′,which is positively correlated with the ratios of Pr/Ph and δ¹³C_aro.But the parameters of tetracyclic and pentacyclic aromatics are negatively correlated with them.However,the parameters of alkylated phenanthrene of mudstones change less,which has shown that Rc ratios are close to the measured Ro.Therefore,organic facies affect PAHs′ parameters obviously.The correlatographs of dibenzothiophene/phenanthrene and Pr/Ph or OF/(OF+F) and SF/(SF+F) reflect that Jurassic source rock is deposited from weak oxidizing shore-shallow lacustrine to oxidative fluvial facies or delta facies. 

Key words： Polycyclic aromatics; Distributional characteristics; Geochemical significance; Jurassic lower mature source rocks; Heshituoluogai basin

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LIU Hong-jun，QIN Li-ming，ZHANG Zhi-huan . Geochemical Significance and Distribution Characterisitics of Polycyclic AromaticHydrocarbons from the Jurassic Source Rocks in the Heshituoluogai Basin,Northwest Junggar[J]. Natural Gas Geoscience, 2012 , 23(6) : 1104 -1115 . DOI: 10.11764/j.issn.1672-1926.2012.06.1104

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