The Isomeric Composition of the Phenyl-polyaromatic Hydrocarbons and Its Implications forThermal Evolution of Organic Matter：A Case Study of Source Rocks in Western Qaidam Basin

ZHANG Ming-feng,ZOU Hong-liang，FENG Bei-zhan，ZHANG Xiao-jun，WU Chen-jun,CHEN Ru,TUO Jin-cai

doi:10.11764/j.issn.1672-1926.2013.05.975

2013 , Vol. 24 >Issue 5: 975 - 981

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.05.975

The Isomeric Composition of the Phenyl-polyaromatic Hydrocarbons and Its Implications forThermal Evolution of Organic Matter：A Case Study of Source Rocks in Western Qaidam Basin

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1.Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，Chinese Academy of Sciences,Lanzhou 730000,China;2.Geological Research Institute,Research Institute of Exploration and Development,Xingjiang Oilfield Company,PeeroChina,Urumqi 830013,China;3.Geological Survey of Province Gansu,Lanzhou 730000,China;4.Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China

Received date: 2013-04-16

Revised date: 2013-05-28

Online published: 2013-10-10

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Abstract

Source rocks from a Tertiary inland lake in the Qaidam Basin (west,China) were analysed for aromatics using capillary gas chromatography-mass spectrometry (GC-MS).The triaromatic members of the new series,phenylnaphthalenes (PhNs) and terphenyls (TrPs),are found in different types of source rocks.The isomeric composition of phenylnaphthalenes and terhenyls was found to depend on thermal maturity.In the samples with lower maturity abundances of 1-PhN and o-TrP are higher.Increase in sample maturity is indicated by an increase in the relative abundance of 2-PhN as well as m-TrP and p-TrP.Three thermal maturity parameters of the organic matter based on the relative abundances of the PhN and TrP isomers are proposed: PhNR=2-PhN/1PhN,TrP1=p-TrP/o-TrP,and TrP2=(m-TrP+p-TrP)/o-TrP.In general their values are positively correlated with vitrinite reflectance (R_O) in a range of 0.47%-1.32%,While correlation of the conventional biomarker maturity parameters (C₂₉ ααα sterane -20S/(20S+20R),C₃₁αβ hopane 22S/(22S+22R),MPI1 ratio) are less apparent with vitrinite reflectance (R_O) in a range of 0.92%-1.32%.So the new parameters perhaps are effective reflecting degree of thermal evolution of organic matter in the mature-highly mature stage.

Key words： The western of Qaidam Basin; Source rocks; Phenyl-polyaromatic hydrocarbons; Phenylnaphthalenes; Terphenyls; Maturity indices

Cite this article

ZHANG Ming-feng,ZOU Hong-liang，FENG Bei-zhan，ZHANG Xiao-jun，WU Chen-jun,CHEN Ru,TUO Jin-cai . The Isomeric Composition of the Phenyl-polyaromatic Hydrocarbons and Its Implications forThermal Evolution of Organic Matter：A Case Study of Source Rocks in Western Qaidam Basin[J]. Natural Gas Geoscience, 2013 , 24(5) : 975 -981 . DOI: 10.11764/j.issn.1672-1926.2013.05.975

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