鄂尔多斯盆地安塞-富县地区延长组-延安组原油地球化学特征及油源对比

doi:10.11743/ogg20060212

Abstract

Abstract:

Crude oil analyses,such as group compositions,carbon isotopes and gas chromatograms of saturated hydrocarbon,as well as characteristics of terpane,sterane and other biomarkers,indicate that crude oil in Yanchang-Yan'an Formations in Ansai-Fuxian area have similar geochemical behaviors and are of low-mature-mature oil.The content of saturated hydrocarbon is over 70%,and the carbon isotope value is relatively light with δ¹³C commonly lower than-31‰.The distribution of normal alkane is complete and appears as single-peak type,with the main peak carbons to be C₁₇-C₂₃.The biomarkers of the oil are characterized by the followings:the content of pentacyclic terpane is larger than that of tricyclic terpane,with C₃₀ hopane and C₂₉ norhopane as the dominant components,and gammacerane as the minor component;sterane is dominated by C₂₇ cholestane and C₂₈ ergostane and C₂₉ sitostane;the homosteranes appear to be in asymmetrical"V"distribution,with relatively low C₂₈ sterane content and about the same C₂₇ and C₂₉ sterane contents.Analyses of geochemical beha-(viors) and correlation of oil and source rocks show that the semideep-deep lake facies sapropelic-mixed type mudstones that occur between Chang 8 and Chang 4+5 reservoirs are the main source rocks.The characteristics of biomarkers reveal that the oil has a certain migration effects.

Key words: carbon isotope, gas chromatogram of saturated hydrocarbon, biomarker, oil-source correlation, Ansai-Fuxian area, Ordos basin

CLC Number:

TE125

Guo Yanqin, Li Wenhou, Chen Quanhong, Cao Hongxia, Zhang Daofeng. Geochemical behaviors of oil and oil-source correlation in Yanchang Yan'an Formations in Ansai-Fuxian area,Ordos basin[J]. Oil & Gas Geology, 2006, 27(2): 218-224.

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Geochemical behaviors of oil and oil-source correlation in Yanchang Yan'an Formations in Ansai-Fuxian area,Ordos basin

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