SALTWATER MONITORING WITH LONG-ELECTRODE ELECTRICAL RESISTIVITY TOMOGRAPHY
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2013, Vol 456, Issue 456
Abstract
Since 2011 the German well logging company Bohrlochmessung – Storkow GmbH and the German Leibniz Institute for Applied Geophysics are engaged in the joint research project ‘SAMOLEG – Saltwater monitoring with long electrode geoelectrics’ (electrical resistivity tomography – ERT), with a grant of the German Federal Ministry of Education and Research. The basic concept of SAMOLEG is to use the existing networks of old steel-cased groundwater measuring wells as current injection and voltage electrodes for electrical resistivity tomography measurements in order to obtain deeper access to salt water bearing aquifers than with conventional surface ERT. Permanent wiring of several old wells would give the opportunity to conduct cost-efficient ERT measurements for saltwater monitoring with a high temporal sampling on sites that are threatened by saltwater rise due to anthropogenic (e.g. natural gas /CO[sub]2[/sub]-storage, water production from wells) or natural causes (e.g. decreasing precipitation due to climate change). First model tank and numerical modelling experiments reveal different sensitivities of ‘equal-length’ and ‘unequal-length’ combinations of wells to rising or laterally inflowing saltwater. Field measurements on a test site in Eastern Brandenburg with known groundwater salinization demonstrate the monitoring potential of the SAMOLEG concept.
Authors and Affiliations
Thomas VOß, Mathias RONCZKA
Keywords
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