权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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，水文地球物理调查有助于勘探含水层和确定含水层的特征，为水管理做准备。地球物理技术利用地球表面的测量，非侵入性地提供地下的物理参数。两种水文地球物理技术，即电阻率层析成像(ERT)和地表核磁共振(SNMR)，已被证明可以获得重要的参数，如含水率、水力传导性和盐度。对于一维层状地球模型，联合反演法的效果优于单项反演法。然而，对岩溶含水层、古水道或咸水入侵等重要的二维结构的调查需求越来越大。拟议项目的主要目标是在二维背景下结合ERT和SNMR，目的是改进含水层系统特征，将其作为地下水调查的常规工具。该项目开发的联合反演结果是电阻率、含水率和松弛时间参数的二维图像。它们的解释将允许区分岩性和流体性质，这是单靠电磁方法不可能做到的。基于这些主要参数，可以反演孔隙度、导水率和盐度，以支持地下水模型。