Mass Transport Properties of Fracture Skins

9316465班尼特 该项目旨在量化裂缝表皮的质量传输特性，并将这些特性应用于流动地下水中质量传输的模拟。 该项目建立在德克萨斯大学奥斯汀分校进行的关于羚羊皮特性的初步研究基础上。 这些研究调查了熔结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、渗透率和皮肤矿物学的根本变化。 本项目将扩大这方面的努力，并将首次据我们所知，通过严格控制的实验室实验来估计裂缝表皮的扩散系数和吸附性。 两个实验装置将被构造来估计这些属性。 一个设计将检查在强制地下水流动条件下，在人造岩柱中裂缝表皮的吸附作用。 第二个设计将利用晶片或磁盘，设计用于得克萨斯大学电子miniperpermeability，以测量扩散系数和吸附样品的裂缝皮肤和未改变的岩石基质。 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问题，从裂缝性储层中提取石油，以及各种基础地质问题，如成岩作用，矿床的形成和地下水补给的计算具有重要意义。 ***

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. ***