CSEM acquisition methods in a multi-physics context
Lucy MacGregor, James Tomlinson and Kim Gunn Maver
Journal name: First Break
Issue: Vol 37, No 11, November 2019 pp. 67 - 72
Info: Article, PDF ( 1.16Mb )
Marine Controlled Source ElectroMagnetic (CSEM) measurements, which determine sub-surface resistivity, have become increasingly successful, and especially in the Barents Sea the method is a key driver in exploration activity. Electrical resistivity data can be acquired in a number of different ways. Traditional measurement of resistivity through well logging has now been complemented by measurements made from the seafloor using a number of different methods, each with unique features and benefits that make CSEM more applicable as part of hydrocarbon exploration and exploitation de-risking and reservoir management. Seismic methods are in general the preferred method for sub-seafloor mapping. CSEM data should be considered a complementary, but very powerful measurement to seismic data, providing additional information, which can reduce interpretation ambiguity especially in relation to hydrocarbon saturation. To ensure consistent prediction of subsurface properties, the applications and limitations of each CSEM method have to be understood and a multi-physics analysis approach should be applied to integrate the CSEM data with seismic data. In this paper the different marine CSEM acquisition methods will be described, positioned in relation to each other and their use within a multi-physics framework will be discussed.