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Prof. Anton Ziolkowski, Bruce Hobbs and David Wright from the Department of Geology and Geophysics, University of Edinburgh present results from a transient electromagnetic experiment claimed to be the first to detect hydrocarbons and to monitor their movement within a reservoir. The method is illustrated with data obtained from two Multi-channel Transient ElectroMagnetic (MTEM) surveys carried out in 1994 and 1996 over an underground gas storage reservoir at St. Illiers la Ville in France.