Containment and Monitoring Institute - Baseline Geophysics for CO2 Monitoring with Crosswell Seismic and Electromagnetics
T.M. Daley, P. Marchesini, M. Wilt, P. Cook, B.M. Freifeld and D. Lawton
Event name: EAGE/SEG Research Workshop 2017
Session: Non-seismic Methods - Gravity Field, InSAR and EM
Publication date: 28 August 2017
Info: Extended abstract, PDF ( 1.34Mb )
Price: € 20
The Containment and Monitoring Institute (CaMI) has built a Field Research Station (FRS) near Calgary, Alberta, Canada, designed around small injections (up to 1000 tonnes per year) of CO2 at depths of approximately 300 m and 500 m. Baseline borehole geophysical surveys have been completed at the CaMI site as part of a larger monitoring effort aimed at detecting and monitoring the small (1-2 ton) gas phase CO2 plume as well as any vertical migration. Crosswell seismic and EM data, as well as borehole-to-surface EM data, were recorded and have sufficient data quality to proceed with time-lapse monitoring. Initial processing for quality control has been accomplished. Seismic processing to date includes initial travel time picking and indicates that data is sufficient for velocity inversion. EM processing includes comparison of acquired data (amplitude and phase) with a layered model based on resistivity logs with repeatability of ~2%. The use of fiberglass casing in one monitoring well supports the use of EM methods. Joint inversion of the seismic and EM measurements (i.e. P-wave velocity and electrical conductivity) is planned to improve the estimate of CO2 saturation in the subsurface.