Patent ID: 8812237

Claim:
A method of performing a crosswell electromagnetic survey, said method comprising the steps of performing a feasibility test based on a background model and a determination of effect of bodies of water or oil on a crosswell survey, the feasibility test including introducing at least one test body of water or oil into the background model to obtain a modeled set of crosswell electromagnetic signals and inverting the modeled set to determine locations of the test bodies; based on a positive result of the feasibility test, obtaining crosswell electromagnetic signals representative of electromagnetic parameters in the earth between two wells; estimating a level of error in obtainment of the crosswell electromagnetic signals; validating the crosswell electromagnetic signals based upon the level of error being below a tolerance level; based upon validation of the crosswell electromagnetic signals, using an inversion of said crosswell electromagnetic signals for the presence of a resistivity anomaly, wherein said resistivity anomaly is assumed to be distributed as one or more bodies characterized by a limited number of geometrical parameters from the entirety of a full data set of geometrical parameters within a known or assumed background held constant for purposes of inversion, and the inversion is used to determine said geometrical parameters, wherein the inversion includes correcting the background model by adjusting position and dimension of the one or more bodies until mismatch between the obtained crosswell electromagnetic signals and the modeled set of crosswell electromagnetic models is less than a specified tolerance.