Reservoir Characteristics and Controlling Factors in the Dolomitic Clastic Rocks of Fengcheng Formation in Northwestern Juggar Basin

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  • 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,Institute ofGeology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2014-07-07

  Revised date: 2015-01-26

  Online published: 2015-05-10

Abstract

With the petroleum exploration and development and comprehensive geological research in northwestern Juggar Basin,high-quality dolomite reservoirs were found in Permian Fengcheng Formation which are characterized by strong heterogeneity,complex and various types of rocks.Through core observation,thin section identification,X-ray,scanning electron microscopy (SEM),physical property data statistics and analysis,the result indicates that high quality dolomitic clastic reservoir mainly include argillaceous silty dolomite,dolomitized mudstone,tuffaceous dolomite and dolomitic tufffaceous shale.Reservoir type is complicated,and characterized by fracture-pore dual medium,with an average porosity of 4.42% and the average permeability is 0.19×10-3μm2.The pore geometry is poor and its throat is tiny,and the reservoir belongs to low porosity and low permeability reservoir.Due to sedimentary environment,dolomitization,tectonism and hydrothermalism have influences on the reservoir physical property and distribution.The reservoir controlling factors was proposed.It is thought generally that depositional environment and sedimentary facies controlled the scale of high quality reservoir and early porosities,while dolomitization,acidic dissolution and hydrothermal fluids influenced secondary pore formation,and the effect of tectonism activity controls the modification effect of reservoir.

Cite this article

ZOU Niu-niu,ZHANG Da-quan,WU Tao,SHI Ji-an,ZHANG Shun-cun,LU Xin-chuan . Reservoir Characteristics and Controlling Factors in the Dolomitic Clastic Rocks of Fengcheng Formation in Northwestern Juggar Basin[J]. Natural Gas Geoscience, 2015 , 26(5) : 861 -870 . DOI: 10.11764/j.issn.1672-1926.2015.05.0861

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