Geochemical application of light hydrocarbons in Kuqa Depression of Tarim Basin: Case study of Dawanqi-Dabei areas
Received date: 2017-01-18
Revised date: 2017-05-02
Online published: 2017-06-10
Located in the Kuqa Depression of Tarim Basin,the Dawanqi and Dabei areas are important oil and gas exploration areas.Light oil takes the predominant composition of the hydrocarbons while the further exploration was impeded by the weakness research of the geochemical characteristics.Gas chromatographic method was taken to analyze the composition and geochemical features of the light oils in Dawanqi and Dabei areas.The C4-C7 composition and methylcyclohexane index of light hydrocarbons suggest the oils were derived from terrigenous humic source.K1 of Mango parameter is largely in line with the transition metal catalysis genesis model showing a preferably coherences of similar origins.Heptane value and isoheptane values show the oils bears with relatively high maturity,which is well conformed to the maturity (RO=0.8%-0.93%) calculated based on the relevance to oil generation temperatures.The results based on the aromaticity/ paraffin indexes and alteration parameters of C7 suggest that several types of alterations including biodegradation,evaporation fractionation and water washing have affected the light hydrocarbons.The study on the characteristic analysis of light hydrocarbon will be of great importance to identify the original source,maturity and alterations.
Ji Hong,Huang Guang-hui,Cheng Ding-shu,Xu Shan-shan . Geochemical application of light hydrocarbons in Kuqa Depression of Tarim Basin: Case study of Dawanqi-Dabei areas[J]. Natural Gas Geoscience, 2017 , 28(6) : 965 -974 . DOI: 10.11764/j.issn.1672-1926.2017.05.002
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