METHOD FOR ELECTROMAGNETIC AIR-WAVE SUPPRESSION BY ACTIVE CANCELLATION AND SHIELDING

摘要

Method for reducing air wave and/or magnetotelluric noise in controlled source electromagnetic surveying by either shielding the source from the air interface, shielding the receivers from downward traveling electromagnetic energy, or by employing a second source to preferentially cancel the air wave (and MT) part of the signal, or a combination of the preceding.