Mass Transport Properties of Fracture Skins

裂缝皮的传质特性

• 批准号: 9316465
• 负责人: Philip Bennett
• 金额: $ 24.66万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-15 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316465&HistoricalAwards=false
• 关键词: Mass; Transport; Properties; Fracture; Skins

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. ***

9316465 Bennett 该项目旨在量化裂缝表层的质量传递特性，并在流动地下水的质量传递模拟中应用这些特性。 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、渗透率和表层矿物学的基本变化。 该项目将扩大这一努力，并且据我们所知，将首次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着率。 将建造两个实验装置来估计这些特性。 一种设计将检查人工裂缝柱中裂缝表层在强制地下水流条件下的吸附作用。 第二种设计将利用设计用于德克萨斯大学电子微型渗透仪的晶片或圆盘来测量裂隙表层和未改变的岩石基质样品的扩散系数和吸附。 这些数据将用于分析和/或数值模型，以估计裂缝表皮如何改变质量传输速率。 研究结果对于放射性（和其他）废物处理设施选址、从裂缝性油藏中提取石油以及各种基本地质问题（例如成岩作用、矿床形成和地下水补给计算）可能具有重要意义。 ***