Abstract: A method of determination of fluid pressures in a subsurface region of the earth uses seismic velocities and calibrations relating the seismic velocities to the effective stress on the subsurface sediments. The seismic velocities may be keyed to defined seismic horizons and may be obtained from many methods, including velocity spectra, post-stack inversion, pre-stack inversion, VSP or tomography. Overburden stresses may be obtained from density logs, relations between density and velocity, or from inversion of potential fields data. The seismic data may be P-P, P-S, or S-S data. The calibrations may be predetermined or may be derived from well information including well logs and well pressure measurements. The calibrations may also include the effect of unloading. The determined pressures may be used in the analysis of fluid flow in reservoirs, basin and prospect modeling and in fault integrity analysis.
January 9, 2004
Date of Patent:
December 20, 2005
Alan R. Huffman, Ernest C. Onyia, Richard W. Lahann, David W. Bell, Robert Lankston
Abstract: The present invention provides a method and apparatus for displaying selected characteristics of geological features. Color-features, for example, hue, saturation and intensity, or other use selected color-features, are assigned to represent different attribute values of geological feature characteristics. The method provides for displaying multiple characteristics of multidimensional geological or other displays in one presentation. Various characteristics that may be displayed concurrently include geological feature position, shape, coordinates, thickness values, petrophysical values, amplitude values, and velocity values. The invention provides a device adapted for use by a workstation wherein geological data is read into memory and processed into a color display of a subterranean feature, or used in a computer programmed to produce images representative of a subsurface geological features.