Efficient 3D Gravity and Magnetic Modeling

There are many different spatial-domain algorithms for 3D gravity and magnetic forward and inverse modeling. However, an efficient modeling tool for petroleum exploration needs algorithms in the wavenumber domain. We have developed, tested and applied such a tool, for both forward and inverse modeling, over two decades. Our algorithms work for density and susceptibility variations of any complex form; compute gravity, gravity gradient and total magnetic intensity (TMI) responses; and invert one field or gradient alone or any combination of these field and gradient components simultaneously. It takes only minutes, not many hours, to complete a joint inversion for structure of a practically sized project on a personal computer.