Evaluating Fracture Roughness and its Effect on Fluid Flow

pi建议在不同岩石学的岩石中测量水力导率、孔径和裂缝的粗糙度，这些岩石有或没有裂缝表皮。高分辨率x射线计算机断层扫描（HRXCT， 250微米分辨率）将用于确定天然岩石裂缝的几何形状和表面粗糙度。在许多具有水力意义的天然裂缝中，凹凸度的大小将等于或超过孔径的大小（即凹凸度高度超过平均孔径）。在这种情况下，经典流体力学的表面粗糙度概念根本不适用。假设是：1。裂缝粗糙度是流体流动和溶质、胶体输运的控制因素。2. 对粗糙裂缝中流体流动的经验规律进行了改进。3. 粗糙度及其影响可以从地质因素中推断出来，包括岩石学、粒度和裂缝表皮成分。该项目包括水力测试、粗糙度分析、花岗岩、砂岩、凝灰岩和碳酸盐岩的岩石学评估。

The PIs propose to measure hydraulic conductivities, apertures, and roughnesses in a suite of fractures from rocks of varying petrology with and without fracture skins. High-resolution X-ray computed tomography (HRXCT; 250micron resolution) will be used define the fracture geometry and surface roughness of natural rock fractures. In many natural fractures of hydraulic significance, the scale of the asperities will equal or exceed the scale of the aperture (i.e., the asperity heights exceed the mean aperture). In this situation, the classical fluid-mechanics concept of surface roughness simply doesn't apply. The hypotheses are: 1. Fracture roughness is a controlling factor for fluid flow and transport of solutes and colloids. 2. Improvements can be made upon the empirical laws for fluid flow in rough fractures. 3. Roughness and its effects are inferable from geological factors, including petrology, grain size, and fracture skin compositions. The project includes Hydraulic tests, roughness analysis, petrographic assessment on Granites, Sandstones, tuffs and carbonates.