METHOD FOR ATTENUATING AIR WAVE RESPONSE IN MARINE TRANSIENT ELECTROMAGNETIC SURVEYING

摘要

A method for measuring the electromagnetic response of formations below thebottom of a body of water includespositioning at least one electromagnetic transmitter (25) and at least oneelectromagnetic receiver (26A) in the body of water eachat a selected depth below the water surface. A transient electric current ispassed through the at least one transmitter. Anelectromagnetic signal is detected at the at least one electromagneticreceiver (26A). The depths are selected so that substantially allelectromagnetic response to the current passed through the transmitter fromthe air above the body of water in the detectedelectromagnetic signal occurs before the beginning of a response originatingin the formations below the water bottom.