Project Summary
This project’s goal was to use electromagnetic data, along with information obtained from gravity and seismic to generate two- dimensional (2D) maps showing the CO2 plume in deep reservoirs. Electromagnetic methods have potential for imaging CO2 plumes at depth and at locations away from boreholes. This is dependent on suitable contrasts in conductivity of the fluids being imaged. Large amounts of current are injected down to the CO2 reservoir storage depth. Two methods of injecting current were used, using a top casing source energising the steel casing and a downhole-casing source. The latter proved to be the most effective means for current injection. Detection of the resulting electric fields is done by sensitive capacitive sensors in a large array at the surface. Researchers collected and processed time series data from 1D and 2D arrays from 400 sensor locations.. The outcomes of the project have been passed on to researchers in ANLEC R&D project 7- 0314, Joint inversion of geophysical monitoring data.
