Analysis of the difference in the hydrocarbon accumulation process between eastern and western parts of Kuqa foreland basin：Case study of Tubei 1 structure and Dina 2 structure

Wu Hai, Yan Shao-huai, Zhao Meng-jun, Zhuo Qin-qong, Wang Long, Bai Dong-lai, Zhang Yue, Sha Wei

doi:10.11764/j.issn.1672-1926.2019.04.001

2019 , Vol. 30 >Issue 7: 1027 - 1036

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.04.001

Analysis of the difference in the hydrocarbon accumulation process between eastern and western parts of Kuqa foreland basin：Case study of Tubei 1 structure and Dina 2 structure

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1.Research Institute of Petroleum Exploration & Development，PetroChina，Beijing 100083，China；
2.Toutai Oilfield Development Company Limited，Daqing Oilfield Company，PetroChina，Daqing 166512，China；
3.School of Earth Sciences and Resources，China University of Geosciences，Beijing 100083，China；
4.College of Geosciences，China University of Petroleum，Beijing 102249，China；
5.Research Institute of Exploration and Development of Qinghai Oilfield，CNPC，Dunhuang 736202，China

Wu Hai(1989-), Male, Engineer, Ph.D, Mainly engaged in petroleum system analysis and hydrocarbon accumulation research. E-mail：wuhai2012@hotmail.com.

Received date: 2019-01-20

Revised date: 2019-04-01

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project “Hydrocarbon accumulation distribution rule and favorable area evaluation in foreland thrust belt and complex structure area” (Grant No. 2016ZX05003-002); the Scientific Research and Technology Development Project of CNPC “Fracture-cap combination quantitative evaluation technique and source storage configuration in foreland basin” (Grant No. 2016B-0502).

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Abstract

It has multi-phase hydrocarbon generation and expulsion，migration and accumulation，adjustment and destruction in Kuqa foreland basin，and the reservoir forming process is complex and varies from region to region.There are few regional comparative studies，which restrict the understanding of region difference of hydrocarbon distribution.Two typical hydrocarbon bearing structure from east to west of Kuqa foreland basin were selected to make comparative analysis，by combining quantitative fluorescence technique，fluid inclusion analytical technique and 2D basin modelling technique.The difference of hydrocarbon accumulation process in the Kuqa foreland basin were systematically compared.The result indicated：(1)The component of light oil accumulated in the west was dominated by tricyclic and tetracyclic aromatics，while the east was dominated by tetracyclic aromatics.Some of the reservoir sections in the east contain residual heavy components from the early crude oil proved by QGF-E and TSF data.(2)The hydrocarbon charge process is characterized by “early oil，late gas，and the gas charge is the most significant”.The early oil charge time was about 15Ma in the west，10Ma in the east，and the thermal evolution of source rock is higher in the west than in the east.About 3Ma ago in the west and 2.5Ma ago in the east，the source rock entered gas generation stage.The trap uplifted sharply during the Himalayan orogeny，and the gas accumulated in the trap quickly and efficiently.(3)In the first stage，the migration pathway of hydrocarbon was vertically upward and then laterally upward when reaching the salt bottom，the fault cut through the salt seal in the shallow burial，causing the leakage of the early oil.In the second stage，the trap in the west kept uplifting，while the east inclined causing the hydrocarbon to migrate to the updip direction and accumulate in the flank area of salt，shallow reservoir or seeping to the earth surface.

Key words： Kuqa foreland basin; Source rock; Fluid inclusion; Quantitative grain fluorescence; Basin modelling; Hydrocarbon migration; PetroMod

Cite this article

Wu Hai, Yan Shao-huai, Zhao Meng-jun, Zhuo Qin-qong, Wang Long, Bai Dong-lai, Zhang Yue, Sha Wei . Analysis of the difference in the hydrocarbon accumulation process between eastern and western parts of Kuqa foreland basin：Case study of Tubei 1 structure and Dina 2 structure[J]. Natural Gas Geoscience, 2019 , 30(7) : 1027 -1036 . DOI: 10.11764/j.issn.1672-1926.2019.04.001

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