In situ Raman spectroscopic study of diffusion coefficients of methane in liquid water under high pressure and wide temperatures
In situ Raman spectroscopic study of diffusion coefficients of methane in liquid water under high pressure and wide temperatures
复制标题
高压宽温液态水中甲烷扩散系数的原位拉曼光谱研究
DOI：
10.1016/j.fluid.2013.09.051
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发表时间：
2013-12-25
影响因子：
2.6
通讯作者：
Wang, Menghan
中科院分区：
文献类型：
--
作者：
Guo, Huirong;Chen, Ying;Wang, Menghan
甲烷通常存在于沉积盆地中，温度至少为473 K。高温高压下甲烷在水中的扩散系数的准确值对于我们理解储层条件下甲烷在孔隙空间中的运移行为是至关重要的。然而，实验数据仅限于低温和低压条件下。采用拉曼光谱法，在高压（40 MPa）和宽温（273 ~ 473 K）范围内测定了甲烷在水中的扩散系数。用Speedy-Angell幂律方法推导出甲烷在水中的扩散系数[D（CH_4），单位为m（2）/s]与温度（T_n K）的关系式为：D（CH_4）= D-0 [T/Ts - 1]（m）其中D-0 = 15.95 × 10 ~（-9）m（2）/s，Ts = 229.8 K，m = 1.8769。在恒温条件下，压力对扩散系数的影响很小。(C)2013爱思唯尔有限公司版权所有。
Methane is commonly found in sedimentary basin at temperatures of at least 473 K. Accurate values of diffusion coefficients for methane in water at high pressure and elevated temperature are essential to our understanding of transport behavior of methane in pore spaces at reservoir conditions. However, the experimental data are limited to conditions at low temperatures and pressures. In this study, diffusion coefficients of methane in water were determined under high pressures (up to 40 MPa) and wide temperature range (from 273 to 473 K) via Raman spectroscopic method. The relationship between diffusion coefficient of methane in water [D(CH4) in m(2)/s] and temperature (Tin K) was derived with Speedy-Angell power-law approach as:D(CH4) = D-0 [T/Ts - 1](m)where D-0 = 15.95 x 10(-9) m(2)/s, Ts = 229.8 K, m = 1.8769. At constant temperature, pressure has very small effect on the diffusion coefficients. (C) 2013 Elsevier B.V. All rights reserved.