Multiple component electromagnetic survey signal acquisition method

摘要

A method for marine electromagnetic surveying includes transmitting a first electromagnetic field oriented in a first direction into a body of water. A second electromagnetic field oriented in a second direction is transmitted into the body of water, wherein the second direction is substantially transverse to the first direction. A parameter related to electromagnetic field amplitude is detected at a plurality of longitudinally and laterally spaced apart positions behind a vessel. The components of the detected electromagnetic field parameter are resolved into components along the first and second directions by using the geometrical symmetries and asymmetries of the transmitting source. Systems for implementing such methods are also provided.

主权项

1. A method for marine electromagnetic surveying, comprising:
transmitting a first electromagnetic field oriented in a first direction into a body of water; transmitting a second electromagnetic field oriented in a second direction into the body of water, wherein the second direction is substantially transverse to the first direction; measuring a parameter related to electromagnetic field amplitude at a plurality of longitudinally and laterally spaced apart positions along the first direction detected by a plurality of spaced apart receivers; and determining a value of the electromagnetic field amplitude in the second direction using the measured amplitudes along the first direction detected by the plurality of spaced apart receivers.