Mass Transport Properties of Fracture Skins

9316465贝内特这个项目寻求量化裂隙皮肤的质量传输特性，并在流动地下水中的质量传输的模拟中起诉这些特性。该项目建立在德克萨斯大学奥斯汀分校对骨折皮肤特性进行的初步研究的基础上。这些研究调查了焊接凝灰岩和古生代砂岩，并记录了与未蚀变岩石相比，岩石孔隙度、渗透率和皮肤中的矿物学发生了根本变化。该项目将扩大这一努力，并将第一次，据我们所知，通过严密控制的实验室实验来估计裂缝皮肤的扩散系数和吸水性。将建造两个实验装置来估计这些性质。一种设计将在地下水强迫流动的条件下，检验人工裂隙柱中裂隙皮肤的吸附作用。第二种设计将利用为德克萨斯大学电子微型渗透仪设计的晶片或圆盘来测量裂缝皮肤和未改变的岩石基质样本的扩散系数和吸附。这些数据将被用于分析和/或数值模型，以估计裂缝皮肤如何改变质量传输速率。这些结果可能对放射性(和其他)废物处理设施的选址、从裂缝性油藏中提取石油以及各种基本地质问题，如成岩作用、矿藏形成和地下水补给计算等问题具有重要意义。***

9316465 Bennett This project seeks to quantify the mass transport properties of fracture skins and to sue these properties in simulations of mass transport in flowing ground water. The project builds on preliminary studies on fracture-skin properties conducted at the University of Texas at Austin. These studies investigated both welded tuffs and Paleozoic sandstones and documented fundamental changes in rock porosity, permeability, and mineralogy in the skins when compared to the unaltered rock. This project will expand this effort and will, for the first time to our knowledge, estimate the diffusion coefficients and sorptivities of fracture skins through closely controlled laboratory experiments. Two experimental apparatuses will be constructed to estimate these properties. One design will examine sorption by fractures skins in an artificial fracture-column under conditions of forced ground-water flow. The second design will utilize wafers or disks, designed for use in The University of Texas electronic minipermeameter, to measure diffusion coefficients and sorption for samples of fracture skins and unaltered rock matrices. These data will be utilized in analytical and/or numerical models to estimate how fracture skins alter the rates of mass transport. The results may be significant in problems of siting radioactive (and other) waste disposal facilities, extraction of petroleum from fractured reservoirs, and a variety of fundamental geological problems, such as diagenesis, formation of mineral deposits, and calculation of ground-water recharge. ***