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.
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