Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 150-159.doi: 10.3969/j.issn.1673-8926.2017.02.019

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The mechanism of reservoir transition through waterflooding of Donghe sandstone in Hadeson Oilfield

LIU Qiang1,2, YU Yichang3, JIANG Tongwen4, XU Huaimin1, CHANG Lunjie2, WANG Chao2   

  1. 1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    4. PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
  • Received:2016-05-22 Revised:2016-08-02 Online:2017-03-21 Published:2017-03-21

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Abstract: In order to block the dominate pathway after waterflooding in Donghe sandstone reservoir of Hadeson Oilfield efficiently,the data of reservoir physical properties,mercury injection,cast thin sections,clay mineral Xray diffraction,scanning electronic microscope and waterflooding interpretation conclusions,were used to study the petrologic features,pore throat structure,reservoir transition rule and mechanism after waterflooding in Donghe sandstone reservoir. The results show that the absolute content of clay mineral Donghe sandstone reservoir is low, and most clay minerals are kaolinite and illite with velocity sensitivity,and range from 1 to 2 μm in grain size.Donghe sandstone reservoir can be divided into three types:thin-micro throat and low permeability reservoir with throat radius less than 2 μm,thin throat and middle permeability reservoir with throat radius of 2-5 μm,and middlethin throat and high permeability reservoir with throat radius larger than 5 μm. Clay mineral block and migration after waterflooding are the reasons for the change of reservoir physical properties. The matching of clay mineral grain size and throat radius controls the reservoir transition rule after waterflooding. There are three kinds of mechanism:the porosity and permeability of thin-micro throat and low permeability reservoir decrease after waterflooding,and they decrease from original to low waterflooding,then slightly increase till middle waterflooding, and decrease again in high waterflooding. The porosity and permeability of thin throat and middle permeability reservoir firstly increase,then increase higher and decrease in high waterflooding. The porosity and permeability of middle-thin throat and high permeability reservoir increase with the increase of waterflooding degree, and this type of reservoir is favorable for advantageous pathway development. There are a large number of residual oil after waterflooding,therefore in the study area,so it is of significance to conduct reservoir transition rule and mechanism research after waterflooding.

CLC Number: 

  • TE34
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