Three-dimensional pore geometry and permeability anisotropy of Berea sandstone under hydrostatic pressure: connecting path and tortuosity data obtained by microfocus X-ray CT
Three-dimensional pore geometry and permeability anisotropy of Berea sandstone under hydrostatic pressure: connecting path and tortuosity data obtained by microfocus X-ray CT
复制标题
静水压力下Berea砂岩的三维孔隙几何形状和渗透率各向异性：微焦点X射线CT获得的连接路径和弯曲度数据
DOI：
10.1144/egsp27.18
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Sato M.
中科院分区：
文献类型：
--
作者：
Takahashi M.;Kato M.;Lin W.;Sato M.
孔隙空间和渗透率是控制流体在岩石和沉积物中运移和储存的两个主要因素。为了研究Berea砂岩中流体流动的各向异性，在有效围压下，在三个垂直方向上测量渗透率作为孔隙压力的函数。渗透率各向异性轻微观察正常和两个平行方向的层面。我们介绍了微焦点X射线计算机断层扫描（CT）作为一种非破坏性的工具和三维中轴（3DMA）的方法来量化的流动相关的几何性质的空隙结构。利用该装置和结构分析软件，我们得到了Berea砂岩任意区域的孔隙尺寸、喉道尺寸和两个面之间的连接路径数的分布。利用这些数据，我们还评估了任意区域内两个面之间的连接路径的数量和弯曲度，并讨论了渗透率各向异性和空隙几何形状之间的关系。
Void space and permeability are two primary factors controlling the movement and storage of fluids in rock and sediments. To investigate fluid flow anisotropy in Berea sandstone, permeability was measured in three perpendicular directions under effective confining pressure as a function of pore pressure. Permeability anisotropy was observed slightly in the normal and in two parallel directions to the bedding planes. We introduced microfocus X-ray computed tomography (CT) as a non-destructive tool and the three-dimensional medial axis (3DMA) method to quantify the flow-relevant geometric properties of the voids structure. Using this apparatus and structure analysis software, we obtained the distributions of pore size, throat size and the number of connecting paths between two faces in an arbitrary region of Berea sandstone. Using these data, we also evaluated the number of connecting paths between two faces and tortuosity within an arbitrary region, and discussed the relationship between permeability anisotropy and voids geometry.