Compensated crosswell tomography methods and systems

摘要

A method and system to compensate for inaccuracies in crosswell tomography is presented. The method includes obtaining data from at least two receivers in response to transmissions from at least two transmitters. Next, at least one compensated value is derived based on the responses of the receivers to the transmitters. Finally, an inversion is performed based at least in part on the compensated value derived. This method eliminates inaccuracies that can be caused by sensor gain and phase variations in the inversion process. Inversion results with gain and phase compensation produce better imaging results that can better help determine the shape and boundaries of the reservoir.

主权项

1. A method for improving image quality of crosswell tomography, comprising:
obtaining data from at least two receivers in response to transmissions from at least two transmitters, wherein the transmitters and receivers are distributed among two or more boreholes; deriving at least one compensated value that combines the data from the at least two receivers' responses to the at least two transmitters as a ratio that cancels errors between actual and assumed characteristics of the at least two receivers and the at least two transmitters; and performing an inversion based at least in part on said compensated value to obtain a sub surface image, wherein said inversion employs a forward model that relates subsurface formation properties to said at least one compensated value.