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Comparison of Magnetometric Resistivity and Electric Resistance Tomography for CO2 Storage MonitoringNormal access

Authors: A. Bouchedda and B. Giroux
Event name: EAGE/SEG Research Workshop 2017
Session: Non-seismic Methods - Gravity Field, InSAR and EM
Publication date: 28 August 2017
DOI: 10.3997/2214-4609.201701935
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.15Mb )
Price: € 20

In this study, we compare the responses of downhole magnetometric resistivity (MMR) and downhole electric resistance tomography (ERT) due to changes in electric resistivity consecutive to CO2 injection in a saline aquifer. The results indicate that a smaller volume of CO2 is detectable with MMR, for noise levels inferred from field data. This is attributed to the fact that the MMR method is sensitive to current density variations and not to absolute values of resistivity. Consequently, the MMR response is not affected by the problem of noise in conductive media, as is the case for ERT (very weak electrical potential in conductive environments). Moreover, sensitivity maps show that the sensitivity patterns have broader extents for MMR.

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