Multiscale Digital Porous Rock Reconstruction Using Template Matching
Multiscale Digital Porous Rock Reconstruction Using Template Matching
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DOI：
10.1029/2019wr025219
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发表时间：
2019-08-01
影响因子：
5.4
通讯作者：
Wang, X.
中科院分区：
文献类型：
--
作者：
Lin, W.;Li, X.;Wang, X.
岩石是非均匀多尺度多孔介质：两个具有相同整体性质的岩石样品在微观结构上可能有很大差异。数字岩石技术和现代3D打印的出现为复制岩石提供了新的机会。然而，成像分辨率和样品大小之间的固有权衡限制了微观结构和宏观结构可以被识别并彼此相关的尺度。在这里，我们开发了一个多尺度的数字岩石建设战略相结合的X射线计算机断层扫描和聚焦离子束（FIB）-扫描电子显微镜（SEM）图像，我们应用该技术的致密砂岩。计算机断层扫描（CT）扫描图像表征宏观尺度的孔结构，而FIB-SEM图像捕获微观尺度的孔纹理。然后通过模板匹配算法和叠加将FIB-SEM图像与CT图像耦合。用这种方法可以恢复整体性质，包括孔隙度和孔喉尺寸分布。用孔隙网络模型预测的最大连通孔隙网络的渗透率分别比使用仅CT和SEM-CT耦合图像的大块岩石测量值大3个数量级和1个数量级。
Rocks are heterogeneous multiscale porous media: two rock samples with identical bulk properties can vary widely in microstructure. The advent of digital rock technology and modern 3-D printing provides new opportunities to replicate rocks. However, the inherent trade-off between imaging resolution and sample size limits the scales over which microstructure and macrostructure can be identified and related to each other. Here, we develop a multiscale digital rock construction strategy by combining X-ray computed microtomography and focused-ion beam (FIB)-scanning electron microscope (SEM) images, and we apply the technique to a tight sandstone. The computed tomography (CT) scanning images characterize macroscale pore structures, while the FIB-SEM images capture microscale pore textures. The FIB-SEM images are then coupled to CT images via a template-matching algorithm and superposition. Bulk properties, including porosity and pore and throat size distribution, can be recovered with this approach. Permeability prediction with a pore network model for the largest connected pore network are 3 orders and 1 order of magnitude greater than the bulk rock measured value using the CT-only and the SEM-CT coupled images, respectively.