Investigation of phase trapping by secondary imbibition within Fontainebleau sandstone
Investigation of phase trapping by secondary imbibition within Fontainebleau sandstone
复制标题
枫丹白露砂岩内二次渗吸相捕获的研究
DOI：
10.1016/j.ces.2004.03.009
复制
发表时间：
2004
影响因子：
4.7
通讯作者：
K. J. Packer
中科院分区：
文献类型：
--
作者：
W. Holmes;K. J. Packer
脉冲磁场梯度激励回波 (PGSTE) NMR 用于研究枫丹白露砂岩强水湿样品中两相（水相和烃相）的同时流动。枫丹白露砂岩是通过二次渗吸过程增加稳态水饱和度而制备的。水饱和度的增加导致越来越多的油相（非润湿相）被困在样品中。受激回波对梯度脉冲面积 q 的依赖性用于导出固定观察时间的位移概率 P(X)。这些驱替概率清楚地表明随着稳态水饱和度的增加，油相逐渐被捕获。根据回波衰减函数EΔ(q)对捕获的油相分数进行定量测量，两者都是水饱和度和观测时间的函数。
Pulsed magnetic field gradient stimulated echo (PGSTE) NMR is used to investigate the simultaneous flow of two phases (an aqueous phase and an hydrocarbon phase) within a strongly water-wet sample of Fontainebleau sandstone. The Fontainebleau sandstone is prepared in increasing steady-state water saturations by a secondary imbibition process. The increase in the water saturation causes an increasing fraction of the oil phase (non-wetting phase) to become trapped within the sample. The stimulated echo dependence on the gradient pulse area, q, is used to derive the displacement probability, P(X), for a fixed observation time. These displacement probabilities clearly show the progressive trapping of the oil phase with increasing steady-state water saturations. Quantitative measurements of the fraction of the oil phase trapped were made from the echo attenuation function EΔ(q), both as a function of water saturation and observation time.