Marine EM exploration
AssigneeMTEM Ltd
InventorAnton Ziolkowski
Life of this patent
Estimating the term…
Abstract
A method for estimating the effects of an airwave in marine electromagnetic data measured using a source and at least one receiver. The method involves measuring the electromagnetic response at two different under water source-receiver separations and using measurements at the larger separation to estimate the airwave response at that separation. The airwave effect in the response measured at the shorter separation can then be determined using the estimated airwave response at the larger separation.
Claims21
A method for estimating the effects of an airwave in marine electromagnetic data measured using a source and at least one receiver, the method comprising measuring the electromagnetic response at two different under water source-receiver separations;
- using one or more measurements at the larger separation to estimate the air wave response at that separation, and using this to estimate the air wave effect in the response measured at the shorter separation.
A system for measuring the earth response to electromagnetic signals applied in a shallow water environment, the system comprising a source and at least one receiver in the water arranged to allow measurements to be taken at two or more different source receiver separations;
- and means for using a measurement at a larger one of the separations to estimate an air wave contribution in the measurement at the shorter separation.
A method, for removing the effects of an airwave from shallow water marine electromagnetic data as measured by at least one source and at least one receiver, using two measurements taken at two different source receiver separations to estimate the air wave contribution at the larger separation and using this to determine the earth response at the shorter separation.
Dependencies are inferred from the claim text.