Abstract
We use a combination of theory and synthetic surveys to understand whether horizontal magnetic data offer additional information over horizontal electric data alone for CSEM inversions. Our results show that the two data types are almost equally effective at detecting reservoirtype resistivity anomalies in the subsurface. We note that the magnetic data produce somewhat better-behaved inversions close to the seafloor, but this advantage is at least partially offset in the field by the smaller dynamic range available in magnetic data. The practical impact is that we may freely substitute magnetic data for electric data on instruments with faulty electric channels when inverting CSEM surveys.
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