Reservoir geological model of fracture low porosity sandstone of Keshen 8 wellblock in Kuqa Depression,Tarim Basin

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  • 1.PetroChina Hangzhou ResearchInstitute of Geology,Hangzhou 310023,China;
    2.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;3.Tarim Oilfield Company,PetroChina,Korla 841000,China

Received date: 2018-03-02

  Revised date: 2018-07-14

  Online published: 2019-08-27

Abstract

In Kuqa Depression of Tarim Basin crassus thrust belt,deep region is one of the important positions of natural gas exploration and development.Reservoir burial depth is 6 000m to 8 000m,the reservoir matrix porosity has an average value of 5.5%,the matrix permeability averages at 0.089×10-3μm2,fracture permeability is (0.5-30)×10-3μm2,and formation permeability is (1-50)×10-3μm2.The reservoir is mainly characterized by low porosity and low permeability.To reveal the model of the relatively high quality reservoirs,this paper took the deep Cretaceous Bashijiqike Group as a case.Based on a large number of experimental analyses,the outcrop reservoir model and FMI log data,through three steps/qualitative modeling and the integration of three-step crack modeling method,we established a fracture-pore type double medium reservoir geological model.Research shows that:The effective reservoir structural fractures opening radius is mainly for 25-150μm,the core structure of the crack opening is generally 50-250μm,and the limb fracture opening is <100μm;Substrate mainly intergranular pore radius is 5μm to 160μm,the pore connectivity rate averaged 48%;Pore throat radius is 0.01-1μm,and the producing gas effective throat radius is >0.05μm which accounts for 91%.Relative good quality matrix porosity of the reservoirs is mainly distributed in the structure of the Cretaceous anticline zone chick group in the upper.Relatively high permeability section focuses on constructing anticline structure parts,east-west wing,the north and the south boundary fault zone and internal secondary fault zone.The geological model and the technical method important for deep natural gas efficient development and provide an important basis for the construction of a productivity of 0.6 billion of keshen Gas Field.

Cite this article

Zhang Rong-hu, Wang Ke, Wang Jun-peng, Sun Xiong-wei, Li Jun, Yang Xue-jun, Zhou Lu . Reservoir geological model of fracture low porosity sandstone of Keshen 8 wellblock in Kuqa Depression,Tarim Basin[J]. Natural Gas Geoscience, 2018 , 29(9) : 1264 -1273 . DOI: 10.11764/j.issn.1672-1926.2018.06.020

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