Long-offset techniques head advances in marine electromagnetic surveying

An electromagnetic (EM) technique for marine hydrocarbon prospecting, first used commercially in November 2002, has gained wide industry acceptance.The technique identifies resistive reservoirs by measuring the energy received at long source-receiver offset distances (approximately greater than three times the reservoir depth).Statoil researchers first showed the potential of the approach during the late 1990s. Electromagnetic Geoservices AS (emgs), based in Trondheim, Norway, was formed in 2002 to commercialize the technique.In the past few years, many improvements have been made to the operating practices, survey equipment, and data-processing techniques. These developments have resulte...

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