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Influences of clay minerals on physical properties of Chang 6 tight sandstone reservoir in Jiyuan area,Ordos Basin

Li Yang1,2,Li Shu-tong1,Mou Wei-wei1,2,Yan Can-can1,2   

  1. 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
  • Received:2017-04-25 Revised:2017-06-16 Online:2017-07-10 Published:2017-07-10

Abstract:

Clay minerals are widely distributed in each layer of the Chang 6 reservoir in Jiyuan area,which is the main interstitial material in the tight sandstone,and plays an important role in controlling the physical properties.Based on the experimental techniques of casting sections,mercury injection,scanning electron microscopy(SEM) and X-ray diffraction(XRD),combined with the analysis of the basic petrological characteristics,it is concluded that Chang 6,mainly consisting of feldspar lithic sandstone and lithic feldspathic sandstone,is a set of tight sandstone reservoir with low porosity and permeability.The average porosity and average permeability are 7.78%-9.13%,(0.20-0.34)×10-3μm2,respectively.Focus on the analysis of the relationship between clay minerals and reservoir physical properties,kaolinite and chlorite are the most common clay minerals and have a complex influence on reservoir physical properties.A small amount of kaolinite and chlorite usually indicates good reservoir porosity,but excessive kaolinite(absolute content>7%) and chlorite(absolute content>10%) will greatly reduce the porosity of the reservoir.The original porosity of Chang 6 sandstone reservoir in Jiyuan area is from 41.13% to 42.04% by calculation.Kaolinite filling caused the decrease of porosity of 4.52%-4.78%,the loss rate is 10.74%-11.38%.The effect of chlorite on Chang 6 sandstone porosity after kaolinite,leading to the decrease of porosity of 4.12%-4.70%,the loss rate is 9.81%-11.18%.Authigenic kaolinite has a constructive effect on the permeability of sandstone,and chlorite plays a major role in reducing the permeability of sandstone.Although illite content is lower than that of kaolinite and chlorite,the porosity and permeability of the reservoir are reduced due to the silk thread forming a bridge type illite filling pores,which lead to the decrease of porosity of 1.33%-2.08%,and the loss rate is 3.17%-4.94%.Therefore,the influence of clay minerals on porosity of Chang 6 tight reservoir in Jiyaun area is as follows: kaolinite>chlorite>illite.

Key words: Clay minerals, Tight sandstones, Reservoir physical properties, Porosity, Permeability, Chang 6 reservoir, Jiyuan area

CLC Number: 

  • TE122.2

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