SUBSURFACE ELECTRIC FIELD MONITORING METHODS AND SYSTEMS EMPLOYING A CURRENT FOCUSING CEMENT ARRANGEMENT

摘要

A subsurface electric field monitoring system includes one or more electric field sensors deployed external to a casing in a borehole formed in a downhole formation. The system also includes a multi-layer cement arrangement external to the casing, where the multi-layer cement arrangement focuses emitted current to a target region of the downhole formation. The system also includes a data processing system that receives measurements collected by the one or more electric field sensors in response to the focused emitted current, wherein the data processing system models the subsurface electric field based on the received measurements.