Abstract: A method includes installing at least one grounded electrode at a certain distance away from the well sufficient enough to avoid electrical breakdowns and connecting a high-voltage electric capacity meter to a wellhead and to said grounded electrode. A voltage pulse between the wellhead and the electrode. An electric capacity is measured before flooding and in the process of flooding. The oil formation water-flooding area radius value is determined by the flooded area capacity variation in time.

Abstract: A method includes installing at least one grounded electrode at a certain distance away from the well sufficient enough to avoid electrical breakdowns and connecting a high-voltage electric capacity meter to a wellhead and to said grounded electrode. A voltage pulse between the wellhead and the electrode. An electric capacity is measured before flooding and in the process of flooding. The oil formation water-flooding area radius value is determined by the flooded area capacity variation in time.

Abstract: The method for the determination of an oil formation's water-flooding area pattern and size in a borehole zone comprises grounded electrode installation at a certain distance away from the borehole sufficient enough to avoid electrical breakdowns. An electrical pulse generator is connected to a wellhead and to the electrode. A voltage pulse is applied between the wellhead and the electrode and electrical and/or acoustic response to electrical disturbances are measured. Pattern and size of the oil formation's water-flooding area is determined by an acquisition and processing system using a 4D seismic method. This method is technically simple to implement and may be applied under different field conditions.