Patent ID: 8990019
Filing Date: 2015-03-24
Classification: G01V,Y02A

Abstract:
1. A method implemented using at least one computer for determining characteristics of a target region which is embedded in background material below a body of water, the method comprising: obtaining data representative of characteristics of an electric dipole of the target region, wherein the data was produced by an electromagnetic survey comprising transmitting a source electromagnetic signal from an antenna to the target region, and using electromagnetic sensors to detect electromagnetic fields responsive to the source electromagnetic signal; determining a resistivity background model using a first inversion procedure that minimizes a first objective function, wherein the first objective function includes a difference between a calculated response field based on a one-dimensional resistivity background model and a measured electric field for a common midpoint that is not above the target region; determining, from the data, the characteristic of the electric dipole of the target region; and computing a resistance for the target region using the characteristics of the dipole and the resistivity background model.