Abstract: A method of seismic analysis is disclosed for extracting information relating to lithology, porosity, fluids, and AVO types and/or displaying the extracted information. In one possible embodiment, AVO points are plotted and a distance and/or angle is utilized for extracting this information. Various portrayals of the extracted information displays may be produced including displays wherein the extracted information is then displayed in terms of colors for respective x, y, z locations. The AVO points may or may not be normalized based on a shape of a cluster of the AVO points prior to extraction of the information.

Abstract: A method of seismic analysis is disclosed for determining geopressures or seismic velocities or other formation attributes. A frequency related attribute is determined from seismic data by analysis of the frequency content of one or more signal traces. Geopressure or velocity may then be derived from the frequency related attribute without reliance on moveout techniques. A derivative of a maximum value of pore pressure is utilized to determine a transition zone whereby the derivative peaks and then recedes. The lithology is then examined to determine a formation directly below the transition zone at which an overpressure may exist.