Hydrocarbon charge process analysis of Tubei 2 structure in Kuqa foreland basin,western China

Wu Hai, Zhao Meng-jun, Bai Dong-lai, Zhou Yan-zhao, Zhou Yan-chen

doi:10.11764/j.issn.1672-1926.2016.04.0600

Natural Gas Geoscience >

2016 , Vol. 27 >Issue 4: 600 - 608

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.04.0600

Hydrocarbon charge process analysis of Tubei 2 structure in Kuqa foreland basin,western China

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1.Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;
2.Key Laboratory of Basin Structure and Hydrocarbon Accumulation,CNPC,Beijing 100083,China;
3.College of Geosciences,Northeast Petroleum University,Daqing 163318,China;
4.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
5.School of Geosciences,Yangtze University,Wuhan 430100,China

Received date: 2015-05-12

Revised date: 2015-08-17

Online published: 2019-09-20

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Abstract

The hydrocarbon charge process of Tubei 2 structure in Kuqa foreland basin was unraveled by the analysis of quantitative fluorescence,fluid inclusion,trap development history,geothermal history,burial and evolution histories.The result shows that the QGF index of the samples in the reservoir are all larger than 5,showing the characteristic of paleo-oil zone.The QGF-E intensity of most formation in Well Tubei 2 is larger than 20pc which means it is the residual oil zone.TSF showsthe hydrocarbon nowadays in the reservoir is not mixed source.By combining palaeo-fluid evidence and reservoir bitumen analysis,it is believed that Tubei 2 structure has experienced three stages of hydrocarbon charges.In the first stage,the matured oil was charged in Late Miocene(11-6Ma)and the fluorescence color of the related fluid inclusions is yellow,after that the fault cut through the salt seal which led to the escape of the hydrocarbon and left some bitumen in the reservoir.The salt transferred into plastic with deeper burial which led to the regaining of sealing ability.In the second stage(4.5-2Ma),the reservoir experienced the charge of light oil and condensate,the related fluid inclusions color is blue.In the third stage(2.5Ma),the reservoir experienced the charge of gas following the second stage without interruption.There is still some residual liquid oil in some strata nowadays mainly because of the presence of shale interlayer.

Key words： Kuqa foreland basin; Tubei 2; Quantitative grain fluorescence; Fluid inclusion; Hydrocarbon charge history

Cite this article

Wu Hai, Zhao Meng-jun, Bai Dong-lai, Zhou Yan-zhao, Zhou Yan-chen . Hydrocarbon charge process analysis of Tubei 2 structure in Kuqa foreland basin,western China[J]. Natural Gas Geoscience, 2016 , 27(4) : 600 -608 . DOI: 10.11764/j.issn.1672-1926.2016.04.0600

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