P115 HYDROCARBON DETECTION AND MONITORING WITH ELECTROMAGNETIC SURVEY DAVID WRIGHT ANTON ZIOLKOWSKI BRUCE HOBBS and DAVID GREEN Summary 1 We present a transient electromagnetic method for the detection of hydrocarbons and for monitoring movement of hydrocarbons 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 Introduction Replacement of brine by gas or oil in a reservoir can cause a change in electrical resistivity of a reservoir rock of as much as 4 orders


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