Patent ID: 8471555
Filing Date: 2013-06-25
Classification: G01V

Abstract:
1. A method for determining the orientation of a directional electromagnetic receiver used in a controlled source electromagnetic survey from the electromagnetic field data measured by the receiver in the survey, hereinafter called “survey data,” said method comprising: (a) selecting a first offset range of said survey data, wherein “offset” means source-receiver separation; (b) selecting a second offset range of directional electromagnetic data; (c) assuming an angular orientation for the receiver relative to a selected coordinate reference frame; (d) using the assumed angular orientation, resolving first offset range data from (a) and second offset range data from (b) into components in a common coordinate reference frame (the “projected components”); (e) comparing at least one projected component from the first offset range to a corresponding at least one projected component from the second offset range for degree of mismatch; (f) adjusting the assumed angular orientation to reduce the degree of mismatch; and (g) repeating steps (d)-(f) until the degree of mismatch is reduced to less than a pre-selected tolerance or other stopping condition is met.