Velocity field measurements in sedimentary rock cores by magnetization prepared 3D SPRITE
Velocity field measurements in sedimentary rock cores by magnetization prepared 3D SPRITE
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DOI：
10.1016/j.jmr.2012.08.004
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发表时间：
2012-10-01
影响因子：
2.2
通讯作者：
Balcom, Bruce J.
中科院分区：
文献类型：
--
作者：
Romanenko, Konstantin;Xiao, Dan;Balcom, Bruce J.
本文讨论了一种适用于沉积岩岩心和颗粒样品三维速度场定量成图的时间效率高的MRI方法。该方法结合了13间隔交替脉冲梯度刺激回波（APGSTE）方案和三维单点斜坡成像与T-1增强（SPRITE）。在q空间原点附近收集一些样本并采用受限k空间采样显著提高了成像方法的性能。APGSTE-SPRITE方法通过绘制宏观珠粒充填和非均质砂岩和石灰岩岩心塞中的三维速度场来说明。所观察到的流动模式是一致的渗透率的一般趋势，增加与孔隙度。低渗透率的区域阻碍了岩心体积内的流动。水倾向于沿着孔隙度较高的宏观区域流动，并穿过孔隙度较低的区域。(C)2012 Elsevier Inc. All rights reserved.
A time-efficient MRI method suitable for quantitative mapping of 3-D velocity fields in sedimentary rock cores, and granular samples is discussed. The method combines the 13-interval Alternating-Pulsed-Gradient Stimulated-Echo (APGSTE) scheme and three-dimensional Single Point Ramped Imaging with T-1 Enhancement (SPRITE). Collecting a few samples near the q-space origin and employing restricted k-space sampling dramatically improves the performance of the imaging method. The APGSTE-SPRITE method is illustrated through mapping of 3-D velocity field in a macroscopic bead pack and heterogeneous sandstone and limestone core plugs. The observed flow patterns are consistent with a general trend for permeability to increase with the porosity. Domains of low permeability obstruct the flow within the core volume. Water tends to flow along macroscopic zones of higher porosity and across zones of lower porosity. (C) 2012 Elsevier Inc. All rights reserved.