1. A method of forming an N-dimensional model of a physical properly for a subsurface region comprising: obtaining geophysical survey data from a subsurface region, wherein the data is sensitive to a physical property; constructing an initial model of the physical property in the subsurface region by performing a less than N-dimensional stochastic inversion of the data; and performing an N-dimensional deterministic inversion of the data using the initial model as a starting model, thereby forming the N-dimensional model of the subsurface region.