Geochemical Characteristics and Origins of the Oils in Wushi Sag,Tarim Basin

GONG De-yu，LI Ming，Li Qi-ming，XIAO Zhong-yao，TAO Xiao-wan，HUANG Shi-peng

doi:10.11764/j.issn.1672-1926.2014.01.62

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 1: 62 - 69

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.01.62

Geochemical Characteristics and Origins of the Oils in Wushi Sag,Tarim Basin

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1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
2.Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2013-06-21

Revised date: 2013-07-26

Online published: 2014-01-10

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Abstract

Great exploration potential in Wushi Sag has been revealed by the successive breakthroughs in Wells of Wucan1,Shenmu1 and Shenmu2.By using gas chromatographs of saturated and light hydrocarbons,we comprehensively studied the geochemical characteristics of the oils in the Wushi Sag and compared them with typical terrestrial and lacustrine (marine) oils in other parts of the Tarim Basin.The pristane/phytane ratio in the Shenmu2 and Wucan1 Wells is 2.35 and 3.53,respectively,obviously demonstrating that it is of coal-derived origin.The oils in the Wushi Sag has a relatively high content of aromatics(benzene and toluene),methylcyclohexane and cyclohexane while a low content of cyclopentane and acyclic hydrocarbons,indicating that a great contribution from the terringenous organic matters was made.The thermal maturity of the oils in the Wushi Sag is at the early period of the high-mature stage with the heptane index ranging from 25.0% to 27.6% and the isoheptane index ranging from 2.5% to 2.7%,respectively.Water washing and biodegradation of oils in the Wushi Sag were not observed.The oils in the study area have obviously experienced the evaporative fraction,resulting in the increase of aromatics and the decrease in n-alkanes.By means of Oil Correlation Star Diagram(OCSD）and the Triangular diagrams of C₇ hydrocarbon，the oils in Wushi Sag was derived from humic organic matters,the same as those in the Dina2 gas-condensates field,which were distinctively different from the lacustrine and marine oils in the Kelasu structure and Tazhong1 Gasfield.From all geochemical features above,it is concluded that the oils in the Wushi Sag were derived from the Jurassic coal measures.

Key words： Tarim Basin; Wushi Sag; Oil correlation; Light hydrocarbon; Terrestrial oils

Cite this article

GONG De-yu，LI Ming，Li Qi-ming，XIAO Zhong-yao，TAO Xiao-wan，HUANG Shi-peng . Geochemical Characteristics and Origins of the Oils in Wushi Sag,Tarim Basin[J]. Natural Gas Geoscience, 2014 , 25(1) : 62 -69 . DOI: 10.11764/j.issn.1672-1926.2014.01.62

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