Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (3): 721-731.doi: 10.13278/j.cnki.jjuese.20190141

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Characterization of Pore Structure and Petrophysical Properties of Tight Sandstone of Yanchang Formation, Ordos Basin

Wang Fuyong, Cheng Hui   

  1. Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249, China
  • Received:2019-07-16 Published:2020-05-29
  • Supported by:
    Supported by National Natural Science Foundation of China (51604285, 51874320)

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Abstract: Based on fractal theory, the pore structures of tight sandstone of Yanchang Formation in Ordos basin were characterized by high pressure mercury intrusion (HPMI) and nuclear magnetic resonance (NMR). The fractal dimension from mercury intrusion capillary pressure was calculated by 3D capillary tube model and wetting phase model, the fractal dimensions of macropores, mesopores, micropores and total pores from NMR T2 spectra were calculated by NMR model, and the correlations between the calculated fractal dimension and petrophysical properties were analyzed. The research results show that the fractal dimensions calculated by mercury capillary pressure and capillary tube model have a better correlation with the petrophysical properties than those by wetting phase model. With the increase of fractal dimension, the median pore radius decreases, the pore structure heterogeneity increases, and the petrophysical properties of tight sandstone become worse; the fractal dimensions of total pores are poorly correlated to tight sandstone petrophysical properties. After the pore size ranges are divided into macropores, mesopores,and micropores, the calculated fractal dimensions of macropores and mesopores are strongly correlated to tight sandstone petrophysical properties compared to micropores, and the petrophysical properties become worse with the increase of the fractal dimensions of macropores and mesopores. It shows that tight sandstone petrophysical properties are mainly dominated by macropores and mesopores, and the fractal dimension can effectively characterize the influence of micropores, mesopores, and macropores on the tight sandstone petrophysical properties.

Key words: tight sandstone, high pressure mercury intrusion, nuclear magnetic resonance, fractal, petrophysical properties, Ordos basin, Yanchang Formation

CLC Number: 

  • P618.13
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