Simulation of Aquifer Architecture and Analysis of Media Heterogeneity

在水文地质学中，含水层结构是一个关键问题，因为它在很大程度上控制着地下流体的运移。虽然地质统计模型可以描述含水层非均质性的某些方面，但仍有一些关于地质过程和环境的信息未被空间相关和连通性模型考虑在内。利用沉积过程模拟、岩石物理学、地质统计学和地下水建模，本提案旨在从地质角度研究含水层结构。这种模拟方法明确地考虑了控制含水层演化的地质过程及其产生的非均质性模式。建议的工作将侧重于冲积环境并研究其中的局部相。大尺度沉积过程模拟提供了完整的三维图像。利用三维地下水流动和颗粒跟踪技术分析冲积层构型对地下水运移的影响。通过地质统计模型得出的模拟含水层的输运将与地质过程模拟得出的输运进行比较。这项工作的最终目的是通过将从地质过程模拟中获得的大规模信息与局部尺度变异性的地质统计学描述相结合，开发一种统一的方法来描述含水层结构。

The architecture of aquifers is of key concern in hydrogeology because it largely controls the transport of subsurface fluids. Although geostatistical models can describe some aspects of aquifer heterogeneity, there is information about geologic processes and environments that has not been accounted for using models of spatial correlation and connectedness. Using sedimentary process simulation, petrophysics, geostatistics, and groundwater modelling, this proposal aims to develop a geologic perspective on aquifer architecture. This simulation approach explicitly considers the geologic processes which control the evolution of aquifers and their resulting patterns of heterogeneity. The proposed work will focus on alluvial environments and study local facies within them. Large-scale sedimentary process modelling provides complete three- dimensional images. The effect of the alluvial architecture on groundwater transport will be analyzed using three-dimensional groundwater flow and particle tracking. Transport through simulated aquifers derived using geostatistical models will be compared with those derived using geologic process simulation. It is the ultimate aim of this work to develop a unified approach to describe aquifer architecture by combining large-scale information developed from geologic process simulation with geostatistical descriptions of local-scale variability.