Patent ID: 8249812
Filing Date: 2012-08-21
Classification: G01V

Abstract:
1. A method of characterizing an earth subterranean structure using a measurement assembly including electromagnetic (EM) receivers and one or more EM sources, the method comprising: receiving measured voltage data collected by the EM receivers in response to transmission by the one or more EM sources; computing in a simulator, based on a model, predicted EM data; and in a data processor, iteratively performing inversion according to a cost function that computes a difference between the measured voltage data and a product of a term containing the predicted EM data and a matrix term containing a distortion data parameter for each EM source or EM receiver that accounts at least for a distortion effect by an environment of the measurement assembly, wherein iteratively performing the inversion solves for parameters of the model and the distortion data parameters; wherein receiving the measured voltage data comprises receiving the measured voltage data from one of a cross-borehole survey, a surface-to-borehole survey, a borehole-to-surface survey, and a single-well borehole-to-borehole survey.