Reservoir Monitoring Using Galvanically Excited Transient Electromagnetic Fields

A system for characterizing an anomalous fluid body in an earth formation using measurements in a borehole intersecting the formation, the system comprising:

• a transmitter configured to, when positioned in a borehole, galvanically excite a transient electric field in the earth formation which interacts with an anomalous fluid body in the earth formation remote from the borehole;
• a receiver configured to, when positioned in the borehole below the transmitter, galvanically receive a corresponding transient electromagnetic (TEM) signal;
• and
• at least one processor configured to estimate a value of a parameter of the anomalous fluid body using the corresponding TEM signal.