1. A method for analyzing seismic data to determine properties of subsurface formations, comprising: obtaining seismic data produced in response to acoustic signals transmitted through the earth; utilizing gathers from said seismic data for producing AVO information comprising a plurality of AVO data points; determining a reference point for said plurality of AVO data points, each of said AVO data points being related to an x, y, z position; and utilizing a distance with respect to said reference point to classify one or more of said AVO data points with respect to at least one of lithology or fluids or porosity.