CSEM data interpretation constrained by seismic and gravity data: an application in a complex geological setting

We describe a novel approach to the interpretation of marine controlled source electromagnetic (CSEM) data based on electromagnetic attributes in combination with gravity and seismic data. This integrated approach involves a new electromagnetic attribute of resistor probability, and has been applied in a complex exploration area in the Barents Sea adjacent to an extensive carbonate platform. We used the data recorded by a total of 172 CSEM receivers from two different surveys. Gravity data were also used to highlight large-scale geological features. Integrating seismic, electromagnetic, and gravity information helped to distinguish resistivity anomalies caused by geological variations from those caused by hydrocarbons. Finally, the hydrocarbon distributions in two stacked reservoirs were accurately mapped. Our integrated approach significantly improved the appraisal of the field, reducing the exploration risk in the surrounding area and facilitating the placement of future wells.