溱潼凹陷低熟油生物标志物特征及成熟度浅析

doi:10.11743/ogg20050419

Abstract

Abstract:

In Qintong sag,low-mature oil occur in several wells and intervals,including the Ed₁ of Yin 2 well and the Et₁ of Su 168 well in Yinzhuang oilfield located in the outer slope zone,the Ef_<sub><sub>3 of Su 168 well in Mao-shan oilfield located in the fault horst zone,and the Ed₁ of Su 228 well in Jiaodunzi oilfield and the Es₁ of Su 120 well in Caoshe oilfield located in the fault bench zone.The low-mature oil are characterized by high wax content,low sulfur content,low kinematic viscosity and large variation of density.The values of ααα C₂₉ sterane's 20S/(20S+20R) and C₂₉ sterane's αββ/(ααα+αββ),the diagnostic indexes for low-mature oil in this sag,are 0.31 and 0.29,respectively.The biomarkers sterane isomerization parameters,ααα C₂₉ sterane's 20S/(20S+20R) is in the range of 0.23-0.29 and C₂₉ sterane's αββ/(ααα+αββ)is in the range of 0.24-0.28;the content of rearranged sterane is very low.At the same time,several unstable biomarkers,including 5β(H)-coprostane,carotane l and dehydroxyl vitamin-E families,are also detected.The observations that the source rocks were deposited in mildly brackish to brackish water and the low maturity of source rocks are well evidenced by the relatively low gammacerane/C₃₀ hopane ratio,sulfur content less than 0.5% and the existence of C₃₀^～C₃₁ lanostane in tetracyclic triterpane.

Key words: Qintong sag, low-mature oil, lanostane, isomerization parameter

CLC Number:

TE112.11

Hu Ying, Zhang Zhihuan, Fang Chaohe. Biomarker features of low-mature oil in Qintong sag and maturity analysis[J]. Oil & Gas Geology, 2005, 26(4): 512-517.

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Biomarker features of low-mature oil in Qintong sag and maturity analysis

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