Characterization of pore structure of low permeability reservoirs using a nuclear magnetic resonance method

被引：91

作者：

Li, Aifen ^{[1
]}

Ren, Xiaoxia ^{[1
]}

Wang, Guijuan ^{[1
]}

Wang, Yongzheng ^{[1
]}

Jiang, Kailiang ^{[1
]}

机构：

[1] School of Petroleum Engineering in China University of Petroleum, Qingdao

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2015年 / 39卷 / 06期

关键词：

High pressure Hg injection; Low permeability reservoir; Movable fluid; Nuclear magnetic resonance(NMR); Pore structure;

D O I：

10.3969/j.issn.1673-5005.2015.06.012

中图分类号：

学科分类号：

摘要：

The flow conductivity of low permeability reservoirs is constrained by their pore structures. Nuclear magnetic resonance(NMR) T2 spectra and mercury intrusion methods can be used to characterize the pore structures of different rocks. In this study, the correlations of NMR T2 relaxation time with pore throat radius (in terms of pore-throat ratio) for fully water-bearing rocks were studied in combination with the mercury intrusion technique, in which the NMR T2 distribution can be converted into a pore throat radius distribution using a method of interpolation and multiple regression. The pore structure, movable fluid distribution, movable oil distribution and the minimum movable fluid pore radius of a tight sand-rock from Ordos Basin were investigated using the inverted pore throat distribution curve. The results show that the complicated pore structure of the tight sand-rock studied is characterized by micro pores and nano-submicron pores with average pore throat radius in the range of 0.095-1.263 microns, and the fluid is mainly bounded in the pores of 0.001-0.01 microns. The movable fluid is mainly distributed in the pores with radius larger than 0.01 microns, and the movable oil that can be displaced by water is mostly in the pores larger than 0.1 microns. The average cutoff value of the pore radius for movable fluid is characterized as 0.013 microns. © 2015, University of Petroleum, China. All right reserved.

引用

页码：92 / 98

页数：6

共 18 条

[1]

Huang Y., Yang Z., He Y., Et al., Nonlinear porous flow in low permeability porous media, Mechanics in Engineering, 5, 5, pp. 1-8, (2013)

[2]

Qi Y., Lei Q., Yu R., Et al., Analysis on factors influencing development effect of extra-ultra low permeability sandstone reservoirs, Journal of China University of Petroleum (Edition of Natural Science), 37, 2, pp. 89-94, (2013)

[3]

Wang R., Shen P., Song Z., Et al., Characteristics of micro-pore throat in ultra-low permeability sandstone reservoir, Acta Petrolei Sinica, 30, 4, pp. 560-563, (2009)

[4]

Yao Y., Liu D., Comparison of low-field NMR and mercury intrusion porosimetry in characterizing pore size distributions of coals, Fuel, 95, pp. 152-158, (2012)

[5]

Hofman J.P., Looyestijn W.J., Slijkerman W.F., Et al., A practical approach to obtain primary drainage capillary pressure curves from NMR core and log data, Petrophysics, 42, 4, pp. 334-343, (2001)

[6]

Yun H., Zhao W., Liu B., Et al., Researching rock pore structure with T2 distribution, Well Loging Test, 26, 1, (2002)

[7]

Liu T., Ma Z., Fu R., Analysis of rock pore structure with NMR spectra, Progress in Geophysics, 18, 4, pp. 737-742, (2003)

[8]

Que H., Lei B., Deriving capillary presure curves from NMR T2 spectra, Journal of Southwest Petroleum Institute, 25, 6, (2003)

[9]

He Y., Mao Z., Xiao L., Et al., An improved method of using NMR T2 distribution to evaluate pore size distribution, Chinese Journal of Geophysics, 48, 2, pp. 373-378, (2005)

[10]

Li H., Zhu J., Guo H., Methods for calculating pore radius distribution in rock from NMR T2 spectra, Chinese Journal of Magnetic Resonance, 25, 2, pp. 273-280, (2008)

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