Four Case Studies for Vertical Time Domain CSEM from the Norwegian Continental Shelf

Vertical-vertical CSEM is an electromagnetic offshore technology that uses specialized sea floor receivers for accurate measurement of the vertical electrical field generated by a vertical transmitter dipole in the sea column. We present four case studies from the North Sea, Norwegian Sea and Barents Sea. The results of the vertical-vertical CSEM method are corendered with seismic and compared to well results. In three of the four cases the wells have been drilled after the CSEM survey had been completed. The results of the drilling confirmed the interpreted resistivity distribution. In one case the vertical-vertical CSEM data was acquired over a known reservoir. The results show that vertical-vertical CSEM can contribute highly valuable information to the drill/drop decision process. This is especially true in cases where no resistive anomaly is found.