The application of the phenanthrene indicator in the oil and gas geochemical exploration

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  • Hefei Training and Testing Center of Assets Management Ltd.of China Petrochemical Corporation,Hefei 230022,China

Received date: 2015-05-20

  Revised date: 2016-02-17

  Online published: 2019-09-19

Abstract

We detected 10 kinds of polycyclic aromatic hydrocarbons such as phenanthrene,acenaphthene,and fluorene in 126 soil samples collected from the top of the three known areas,and,from the oil and gas geochemistry angle,selected three indicators of phenanthrene/acenaphthene,phenanthrene/fluorene,phenanthrene/benzo (a) pyrene optimizedly combined with the nature of the polycyclic aromatic hydrocarbons (PAHs).From the result of the application in the known areas,we summed up the predictable and discriminant model of oil and gas properties in the surface that there are oil reservoirs where all of the phenanthrene/acenaphthene,phenanthrene/fluorene,phenanthrene/benzo (a) pyrene show high value anomaly,and gas reservoirs where the edge shows high value anomaly and the center is low,and there are fault zone where phenanthrene/acenaphthylene and phenanthrene/fluorene are high anomaly,and phenanthrene/benzo (a) pyrene is low.Some average values of polycyclic aromatic hydrocarbons can be used as discriminant indicators of oil and gas properties.The total values of the tetracyclic and pentacyclic hydrocarbons were the lowest in the light oil reservoir and natural gas reservoir and the highest in the medium-heavy oil reservoir.The indicators of total value of tricyclic/tetracyclic hydrocarbons,tricyclic/pentacyclic hydrocarbons and weight ratio are the highest in the light oil reservoir,medium in the natural gas reservoir and lowest in the medium-heavy oil reservoir.The phenanthrene/acenaphthene and phenanthrene/fluorene and other indicators are highly correlated,reflecting the content characteristics of themselves in the oil and gas reservoirs.The order of the phenanthrene’s ability of migrating from the reservoirs to the surface is heavy oil<medium oil< light oil < the moisture.As benzo (a) pyrene is the environmental background indicator,the order of phenanthrene/benzo (a) pyrene is also heavy oil< medium oil< light oil < moisture.

Cite this article

Li Guang-zhi, Bi Wen-tao, Hu Bin, Zhang Zong-yuan, Zhou Qiong, Gao Wei, Yu Rong-xin . The application of the phenanthrene indicator in the oil and gas geochemical exploration[J]. Natural Gas Geoscience, 2016 , 27(6) : 1067 -1073 . DOI: 10.11764/j.issn.1672-1926.2016.06.1067

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