Stationary star-shaped antenna method for manipulating focused beamformed, shaped fields and beamsteered electromagnetic signal from subtel sedimentary stratigraphic formations deep in the earth

摘要

A method for electromagnetic geophysical surveying according to one aspect of the invention includes disposing a plurality of electromagnetic receivers in a selected pattern above an area of the Earth's subsurface to be evaluated. An electromagnetic source is repeatedly actuated proximate the electromagnetic receivers. Signals generated by the receivers, indexed in time with respect to each actuation of the at least one electromagnetic energy source, are recorded. The recorded signals are processed to generate an image corresponding to at least one point in the subsurface. The processing includes stacking recordings from each receiver for a plurality of actuations of the sources and beam steering a response of the receivers such that the at least one point is equivalent to a focal point of a response of the plurality of receivers.

主权项

1. A method for electromagnetic geophysical surveying, comprising:
disposing a plurality of electromagnetic receivers in a selected pattern above an area of the Earth's subsurface to be evaluated; actuating a first electromagnetic energy source proximate the electromagnetic receivers; actuating at least one other electromagnetic energy source proximate the electromagnetic receivers after a selected time delay; recording signals generated by the receivers indexed in time with respect to each actuation of the electromagnetic energy source; and processing the recorded signals to generate an image corresponding to at least one point in the subsurface, the processing including stacking recordings from each receiver for a plurality of actuations of the electromagnetic energy sources and beam steering a response of the receivers such that the at least one point is equivalent to a focal point of a response of the plurality of receivers.