Three-dimensional numerical modeling of surface-to-borehole electromagnetic method for monitoring reservoir

摘要

Dynamic exploration for oil and gas requires careful monitoring of reservoir contents for safety and efficiency of oil extraction.This paper proposes a multi-source and multi-azimuth walk-around vertical electromagnetic profiling (MM-VEP) technique for surface-to-borehole electromagnetic surveying.Based on the difference in conductivities between reservoirs with different concentrations of oil and water,MM-VEP can be used to monitor reservoirs as they are injected with water.The MM-VEP response in five azimuth planes is modeled with three-dimensional (3D) integral equation calculations.The progress of waterflooding in four stages for enhanced oil recovery is shown to be indicated by field anomalies MM-VEP caused by variations in the reservoir resistivity.Numerical modeling demonstrates that MM-VEP measurements provides enough quantitative information from an underground reservoir to accurately detect oil deposits and monitor the progress of waterflooding.