Joint Magnetic Resonance and Electrical Resistivity Tomography as hydrogeophysical characterization tool

联合磁共振和电阻率断层扫描作为水文地球物理表征工具

基本信息

批准号：
280065108
负责人：
Professor Dr. Mike Müller-Petke
金额：
--
依托单位：
Leibniz-Institut für Angewandte Geophysik (LIAG)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/280065108?language=en
关键词：
Joint Magnetic Resonance Electrical Resistivity

项目摘要

As water belongs to the most important resources, hydrogeophysical investigations contribute to the exploration and characterization of aquifers in preparation of water management. Geophysical techniques provide physical parameter of the subsurface non-invasively using measurements at the Earths surface. Two hydrogeophysical techniques, Electrical-Resistivity-Tomography (ERT) and Surface-Nuclear-Magnetic-Resonance (SNMR), have proven to yield important parameter such as water content, hydraulic conductivity and salinity. The impact of combining these techniques using joint inversion has been demonstrated to be superior to individual inversions for 1D layered earth models. However, there is a growing demand for investigation of significantly two-dimensional structures such as karst aquifers, paleo-channels or saltwater intrusion. Main objective of the proposed project is to combine ERT and SNMR in a 2d context with the aim of improved aquifer system characterization as a routine tool for groundwater investigations. Results of the combined inversion developed in this project are two-dimensional images of the parameters resistivity, water content and relaxation time. Their interpretation will allow distinguishing between lithology and fluid properties, which is impossible with electromagnetic methods alone. Based on these primary parameters, porosity, hydraulic conductivity and salinity can be retrieved in order to support groundwater models.

由于水属于最重要的资源，因此水域研究有助于勘探和表征含水的水管理。地球物理技术使用地球表面的测量值提供了地下的物理参数。事实证明，两种水地技术，电抗性 - 托管学（ERT）和表面 - 核刺激性 - 磁性共和力（SNMR）已证明可以产生重要参数，例如水含量，液压电导率和盐度。证明使用关节反演组合这些技术的影响已被证明优于一维地球模型的单个反转。然而，对显着二维结构（例如喀斯特含水层，古通道或盐水侵入）等二维结构进行研究的需求日益增长。拟议项目的主要目的是将ERT和SNMR在2D上下文中相结合，以改善含水层系统作为地下水研究的常规工具。该项目中开发的组合反演的结果是参数电阻率，水含量和放松时间的二维图像。它们的解释将允许区分岩性和流体特性，仅电磁方法是不可能的。基于这些主要参数，可以检索孔隙率，液压电导率和盐度以支持地下水模型。