noble farms in on agc profond, page-23

50% CoS is Rocksource's estimate based on simultaneous interpretation of 3D seismic data and CSEM resistivity data. Use of simultaneous seismic/CSEM data to derisk prospects is Rocksource's leading edge advantage in this game. They do not engage in prospects which cannot be derisked through strong CSEM anomalies in addition to traditional seismic indications.

However, the use of CSEM is not yet common in the industry. Noble's 20% CoS estimate is obviously based on seismic data only, and 20% CoS is quite standard in that context.