Remote Mapping of Hydrocarbon Extent Using Marine Active Source EM Sounding

F-17 REMOTE MAPPING OF HYDROCARBON EXTENT USING MARINE ACTIVE SOURCE EM SOUNDING Summary 1 Active Source Electromagnetic (EM) Sounding is a marine surveying technique for remotely mapping subsurface resistivity structure (Young & Cox 1981 Sinha et al. 1990). The technique is very sensitive to the presence of buried thin resistors (thin with respect to their depth of burial) such as hydrocarbon bearing reservoirs. However in addition to the detection of thin resistors it is also possible to identify their lateral extent. Through the analysis of data derivatives we are able to accurately locate the edge of hydrocarbons within a reservoir