ELECTROMAGNETIC SURVEYING FOR HYDROCARBON RESERVOIRS

摘要

An electromagnetic survey method for surveying an area of seafloor (6) that is thought or known to contain a subterranean hydrocarbon reservoir (12), comprising obtaining a first survey data set with a vertical electric dipole (VED) antenna (22) for generating vertical current loops and a second survey data set with a vertical magnetic dipole (VMD) (23) antenna for generating horizontal current loops. In an alternative embodiment, the VMD antenna is dispensed with and the horizontal electromagnetic field is derived from the naturally occurring magnetotelluric (MT) electromagnetic field. In another alternative embodiment, the VED data is compared with a background geological model instead of VMD or MT data.