Electromagnetics

摘要

A technology that is rapidly gaining the notice of prospectors is electromag-netics.Like most"breakthroughs,"it's not a new concept.For decades,EM has been a staple borehole application,and has been used in mining applications at very shallow depths.Magnetotellurics,a passive EM technique that looks at basement structures over broad areas,is a sister technology that has been available for a number of years.Today's excitement is being generated by active-source EM,a technology that has added a whole dimension of applications and is rapidly becoming a must-have tool for deepwater prospecting.