Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 38-49.doi: 10.12108/yxyqc.20220503

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Difference of maturity parameters of mixed crude oil and its geological significance:A case study of Ordovician in Tuofutai area,Tabei uplift

CHEN Zhonghong1,2,3, CHAI Zhi1   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. School of Resources and Environment, Yangtze university, Wuhan 430100, China;
    3. Hubei Key Laboratory of Petroleum Geochemistry and Environment, Wuhan 430100, China
  • Received:2022-02-23 Revised:2022-04-24 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on the characteristics of physical properties,group component,molecular marker and maturity of Ordovician crude oil in Tuofutai area of Tabei uplift in Tarim Basin,the differences of maturity parameters after crude oil mixing and their geological significance were analyzed. The results show that:(1)Although different maturity parameters indicate that the crude oil is in mature to high maturity stage,the values of maturity calculated from light hydrocarbons and diamondoids are higher than that calculated from steranes,terpanes and aromatics. This phenomenon is caused by the mixing of crude oil with different maturity,which can be used as favorable evidence for multi-stage filling and mixing. Light hydrocarbons and diamondoids mainly reflect the maturity of latefilled crude oil,while steranes and terpanes,phenanthrenes and dibenzothiophenes usually indicate the maturity of early-filled crude oil.(2)Due to the difference in resistance to biodegradation of different maturity parameters,biodegradation will lead to different changes in maturity parameters.(3)The differences of maturity parameters calculated from the light hydrocarbons,diamondoids,steranes,terpanes and aromatics on the plane reflect the changes of hydrocarbon filling pathway or the activity of oil-source faults.(4)The physical properties of crude oil are a comprehensive reflection of various components and basic parameters for analyzing regional hydrocarbon accumulation mechanism.

Key words: group component features, molecular markers, crude oil maturity, crude oil mixing, crude oil filling, Ordovician, Tuofutai area, Tabei uplift

CLC Number: 

  • TE122.1
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