Patent ID: 8570044

Claim:
A method of analyzing content of a subterranean geological structure, comprising: receiving, by a computer, first data corresponding to electric field measurements at plural source-receiver azimuths in a predefined range; receiving, by the computer, second data corresponding to total magnetic field measurements at plural source-receiver azimuths in the predefined range; wherein the received first and second data corresponding to the electric field measurements and the total magnetic field measurements are acquired using electromagnetic (EM) receivers carried by a plurality of cables towed by at least one marine vessel, at least two of the plurality of cables also carrying respective EM sources, and wherein the azimuths are defined between the EM sources and the EM receivers carried by the cables; and providing the first data and the second data to an analysis module executed in the computer to determine electrical resistivity anisotropy of the subterranean geological structure.