Classification of pore structures in typical tight sandstone gas reservoir and its significance:A case study of the He8 Member of Upper Palaeozoic Shihezi Formation in Ordos Basin,China

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  • 1.College of Geoscience,China University of Petroleum (Beijing),Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,Beijing 102249,China;
    3.Research Institute of Petroleum Exploration and Development-Langfang Branch,PetroChina,Langfang 065007,China;
    4.Unconventional Natural Gas Research Institute,China University of Petroleum(Beijing),Beijing 102249,China)

Received date: 2015-09-20

  Revised date: 2015-10-11

  Online published: 2019-09-20

Abstract

Based on the existing classification methods of reservoir pore structure and 265 samples of mercury injection experiments from the tight gas reservoir of Upper Palaeozoic He 8 member in Ordos Basin,this paper discussed the classification of pore structures in typical tight sandstone gas reservoir.Considering that certain overlaps exist between the pore structure parameters which reflect the classification information,three factors were extracted from the seven parameters including porosity (Φ),permeability (K),displacement pressure (Pd),median pressure (P50),median pore throat radius (R50),sorting coefficient (Sp) and maximum mercury saturation (Smax) using Q-model principal factor analysis.According to comprehensive information characteristics from the main factors,three main factors were named as pore throat size factor,porosity-permeability factor and pore throat sorting factor,respectively.Taking the three principal factors as cluster new variables,combining characteristics of capillary pressure curve and arthroscopic characteristic,pore structures of typical tight sandstone gas reservoir are divided into four types.Through Fisher discriminant method,the correct discrimination rate of clustering results can reach 87.5%,and accordingly,discriminant functions are established to divide the type of pore structure:Type Ⅰ (Y1>2.51),Type Ⅱ (Y1=-0.12-2.51),Type Ⅲ (Y1=-3.72--0.12),and Type Ⅳ (Y1<-3.72).The results show that Type Ⅰ and Type Ⅱ pore structures are in most favor of tight sandstone gas reservoir,and they also present that this classification is consistent with the test gas data.It will also provide solid geological evidence for high quality reservoirs and further regional exploration and development of tight gas in the Ordos Basin.

Cite this article

Wu Hao, Liu Rui-e, Ji You-liang, Zhang Chun-lin, Zhou Yong, Zhang Yun-zhao . Classification of pore structures in typical tight sandstone gas reservoir and its significance:A case study of the He8 Member of Upper Palaeozoic Shihezi Formation in Ordos Basin,China[J]. Natural Gas Geoscience, 2016 , 27(5) : 835 -843 . DOI: 10.11764/j.issn.1672-1926.2016.05.0835

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