1. A method for enhancing geophysical data, the method comprising: obtaining geophysical data of two or more types for a subsurface region, the two or more types including at least a first type of geophysical data and a second type of geophysical data; determining an approximation to the obtained geophysical data of the first type; performing, using a computer, a wave-field transformation on the approximation to form a transformed approximation, wherein the transformed approximation corresponds to the obtained geophysical data of the second type; either adjusting the transformed approximation to substantially match the obtained geophysical data of the second type at corresponding locations, or computing a mismatch between the transformed approximation and the obtained geophysical data of the second type at corresponding locations; and using the adjusted approximation or the mismatch to enhance a geophysical data representation of the subsurface region.