Monitoring the Complete Life-cycle of a CO2 Storage Reservoir – Demonstration of Applicability of Geoelectrical Imaging

Abstract In this paper, the applicability of deep downhole geoelectrical monitoring for detecting CO 2 related signatures is evaluated after a nearly ten year period of CO 2 storage at the Ketzin pilot site. Deep downhole electrode arrays have been studied as part of a multi-physical monitoring concept at four CO 2 pilot test sites worldwide so far. For these sites, it was considered important to implement the geoelectrical method into the measurement program of tracking the CO 2 plume. Analyzing the example of the Ketzin site, it can be seen that during all phases of the CO 2 storage reservoir development the resistivity measurements and their corresponding tomographic interpretation contribute in a beneficial manner to the measurement, monitoring and verification (MMV) protocol. The most important impact of a permanent electrode array is its potential as tool for estimating reservoir saturations.