Science & Technology Review >

2014 , Vol. 32 >Issue 32: 60 - 66

DOI: https://doi.org/10.3981/j.issn.1000-7857.2014.32.010

Quantitative Characterization of Shale Reservoir of Upper Paleozoic Shale in the Eastern Margin of Ordos Basin

  • ZHAO Keying ,
  • GUO Shaobin ,
  • LIU Xinshe ,
  • ZHAO Huitao ,
  • HOU Yundong ,
  • WANG Huaichang
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  • 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. Changqing Oilfield Company, PetroChina Company Limited, Xi'an 710018, China

Received date: 2014-08-03

  Revised date: 2014-09-01

  Online published: 2014-11-27

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Abstract

Shale gas exists in forms of free state and adsorption state in shale. Micro pore and micro fracture in shale are the main locations of the reservoir space and the drainage channels of the shale gas and the gas content is related to the pore fracture growth degree. So it is very important to study the micro pore and the micro fracture in the shale reservoir. In this paper, based on the results of the field emission scanning electron microscopy, the argon ion polishing and the nuclear magnetic resonance, the micro pore and micro crack morphologies in the Upper Paleozoic in the eastern margin of Ordos Basin are analyzed. The pore size and the development degree of the micro-scale pore, the nano-scale pore and the fracture are quantitatively analyzed. The comprehensive analysis shows that the main reservoir space of shale is the micropore and the microcrack with organic pore as revealed mainly by the argon ion polishing and the clay mineral micro pore as revealed mainly by the scanning electron microscope. The micron pore size is in the range of 1.32~5.58 μm and its average area percent of pore is in the range of 19.48%~23.66%. The average size of the organic micro pore is in the range of 56.51~80.75 nm and its average area percent of pore is in the range of 7.45%~9.66%. The percent of crack is in the range of 0.69%~5.13%. Effective porosity is in the range of 0.25%~1.33%, which accounts for 16%~46% of total porosity. Comprehensive analysis reveals that the shale reservoir of Shanxi of Taitou is the best, because of the relatively low buried depth, the full development of micro-scale pore, the relatively high percentage of crack/micro crack of 56.51~80.75 nm and its average area percent in the range of 7.45% ~9.66%. The proportions of the crack and the movable fluid are 2.18% , 10.82% , respectively, and the mean value of effective porosity is 0.76% amounting to 16%~41% of the total pore. The quantitative study of micro pore and micro crack provides a reliable basis for the further study of shale gas of Upper Paleozoic in this region.

Key words： east merging of Ordos Basin; Upper Paleozoic; shale; micron pore; nano-scale pore; percent of crack

Cite this article

ZHAO Keying , GUO Shaobin , LIU Xinshe , ZHAO Huitao , HOU Yundong , WANG Huaichang . Quantitative Characterization of Shale Reservoir of Upper Paleozoic Shale in the Eastern Margin of Ordos Basin[J]. Science & Technology Review, 2014 , 32(32) : 60 -66 . DOI: 10.3981/j.issn.1000-7857.2014.32.010

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