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水分子在微孔隙介质中的受限扩散模拟

, PP. 49-60

Keywords: 核磁共振(NMR),受限扩散,微小孔隙,有限差分,随机游走

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Abstract:

在饱和多相流体孔隙介质中,利用核磁共振测得的扩散系数可以区分油气水,并用于饱和度等岩石物理参数的求取,但在微小孔隙(<20μm)中,流体的表观扩散系数会偏离其自由扩散系数.通过有限差分和随机游走模拟方法对水分子在单孔隙及多孔隙介质中的扩散进行数值模拟,考察水分子扩散受限的程度.结合核磁共振在测井及实验室岩石物理应用的技术,进一步分析了受限扩散对求取油水饱和度等岩石物理参数造成的影响.同时,分析总结了两种模拟方法的使用条件及优缺点.

References

[1]  Hürlimann M D, Venkataramanan L. Quantitative measurement of two-dimensional distribution functions of diffusion and relaxation in grossly inhomogeneous fields[J]. J Magn Reson, 2002, 157(1): 31-42.
[2]  Minh C C, Heaton N, Ramamoorthy R, et al. Planning and interpreting NMR fluid-characterization logs[C]. Society of Petroleum Engineers, 2003, SPE 84478.
[3]  Zielinski L J, Hürlimann M D. Probing short length scales with restricted diffusion in a static gradient using the CPMG sequence[J]. J Magn Reson, 2005, 172(1): 161-167.
[4]  Viswanathan K, Kausik R, Minh C C, et al. Characterization of Gas Dynamics in Kerogen Nanopores by NMR[C]. Society of Petroleum Engineers, 2011, SPE 147198.
[5]  Mitra P P, Sen P N. Effects of microgeometry and surface relaxation on NMR pulsed-field-gradient experiments: Simple pore geometries[J]. Phys Rev B, 1992, 45(1): 143.
[6]  Mitra P P, Sen P N, Schwartz L M, et al. Diffusion propagator as a probe of the structure of porous media[J]. Phys Rev Lett, 1992, 68(24): 3 555-3 558.
[7]  Helmer K, Hurlimann M D, Deswiet T, et al. Determination of ratio of surface area to pore volume from restricted diffusion in a constant field gradient[J]. J Magn Reson, 1995, 115(2): 257-259.
[8]  Torrey H C. Bloch equations with diffusion terms[J]. Phys Rev, 1956, 104(3): 563-565.
[9]  Blees M H. The effect of finite duration of gradient pulses on the pulsed-field-gradient NMR method for studying restricted diffusion[J]. J Magn Reson, 1994, 109(2): 203-209.
[10]  Ramakrishnan T, Schwartz L, Fordham E et al. Forward models for nuclear magnetic resonance in carbonate rocks[C]. SPWLA 39th Annual Logging Symposium, 1998.
[11]  Zheng L H, Chiew Y C. Computer simulation of diffusion controlled reaction in dispersions of spherical sinks[J]. J Chem Phys, 1989, 90(1): 32-327.
[12]  Brownstein K R, Tarr C. Importance of classical diffusion in NMR studies of water in biological cells[J]. Phys Rev A, 1979, 19(6): 2 446-2 453.
[13]  Sen P N, André A, Axelrod S. Spin echoes of nuclear magnetization diffusing in a constant magnetic field gradient and in a restricted geometry[J]. J Chem Phys, 1999, 111: 6 548-6 555.
[14]  Stejskal E O, Tanner J. Spin diffusion measurements: Spin echoes in the presence of a time‐dependent field gradient[J]. J Chem Phys, 1965, 42: 288-292.
[15]  Valfouskaya A, Adler P, Thovert J F, et al. Nuclear-magnetic-resonance diffusion simulations in porous media[J]. J Appl Phys, 2005, 97(8): 083510(01-12).
[16]  Coats G R, Xiao L Z, Prammer M G. NMR Logging Principles and Applications[M]. Houston: Gulf Professional Publishing, 1999.
[17]  Li Xin(李新), Xiao Li-zhi(肖立志), Hu Hai-tao(胡海涛). Characteristics of NMR logging while drilling tools(随钻核磁共振测井仪器探测特性研究)[J]. Chinese J Magn Reson(波谱学杂志), 2011, 28(1): 76-83.
[18]  Song Y Q, Ryu S, Sen P N. Determining multiple length scales in rocks[J]. Nature, 2000, 406(6 792): 178-181.
[19]  Gong Guo-bo(龚国波). Sun Bo-qin(孙伯勤), Liu Mai-li(刘买利), et al. NMR relaxation of the fluid in rock porous media(岩石孔隙介质中流体的核磁共振弛豫)[J]. Chinese J Magn Reson(波谱学杂志), 2006, 23(3): 379-395.
[20]  Freedman R, Heaton N, Flaum M, et al. Wettability, Saturation, and Viscosity from NMR measurements[C]. SPE Journal, 2003, 8(4): 317-327.

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