Geochemical and Physical Aquifer Heterogeneity: Correlation with Sedimentary Facies

该项目的目标是验证一个假设：沉积含水层的地球化学和物理性质与相相相关。该假设的一个结果是，物性非均质性必然与相分布有关。如果这一假设是正确的，那么相图绘制可以提供沉积含水层物理和化学输运性质空间结构的定量信息。此外，基于相的方法将有助于深入了解渗透率和反应性之间的关系。拟议的项目试图在一个地点-博登遗址-测试这一假设。选择用于量化的具有代表性的含水层地球化学和物理性质是模型疏水有机化学（HOC）的吸附系数（Kd），它提供了反应性的度量，以及渗透率(k)。拟建项目的具体目标是确定：1。相在解释差异中的意义（）。（即异质性）的k和HOC KD；2 . k与HOC KD的空间性质及空间相合度；3 .这两种性质与各相沉积基本性质的关系；图相分布在预测k和Kd分布方面的准确性。这项工作的一个主要贡献是该系统的地质学——构成沉积物的基本物质以及它们的运输和沉积过程——为理解化学性质的非均质性提供了框架。该项目将提供沉积相与地球化学和物理水文性质之间基本关系的定量信息。这是一系列旨在评估沉积含水层化学性质变化的大型研究的一部分。我们期望这些结果将改变沉积含水层水文地球化学性质非均质性的概念。d。

A 9804980Allen-KingThe goal of the proposed project is to test the hypothesis: geochemical and physical properties of sedimentary aquifers are correlated to facies. A consequence of the hypothesis is that property heterogeneity must be related to the distribution of facies. If this hypothesis is correct, facies mapping can provide quantitative information about the spatial structure of physical and chemical transport properties of sedimentary aquifers. Additionally, a facies-based approach will yield insight into relations between permeability and reactivity.The proposed project seeks to test the hypothesis at one site - the Borden sites. The representative geochemical and physical aquifer properties selected for quantification are the sorption coefficient (Kd) for a model hydrophobic organic chemical (HOC), which provides a measure of reactivity, and the permeability (k). The specific objectives of the proposed project are to determine:1. the significance of facies in explaining the variance (. i.e. heterogeneity) of k and HOC KD;2. the spatial properties of, and spatial coffelation between, k and HOC KD;3. Relationships between these two properties and fundamental sediment properties of each facies;4. the accuracy of a mapped facies distribution in predicting the distributions of k and Kd.A major contribution of this work is that the geology of the system - the basic materials which make up sediments and the processes which transport and deposit them - provides the framework for understanding chemical property heterogeneity. This project will produce quantitative information on the basic relationships between sedimentary facies and geochemical and physical hydrologic properties. It is one part of a larger sequence of studies designed to assess the variability of chemical properties of sedimentary aquifers. We anticipate that the results will transform the way that hydrogeochemical property heterogeneity is conceptualized for sedimentary aquifers. d.