University of Texas at Austin

Patents

Patent No.: US 8,325,559 B2 [PDF]
Date of Patent: December 4, 2012

Title: Extracting SV Shear Data from P-wave Marine Data

Inventors: Bob A. Hardage

Abstract
A system and method of processing seismic data obtained using a plurality of towed single-component receivers in a marine environment is described, the towed single-component receivers configured to measure compressional P waves. The method comprises retrieving seismic data from a storage device, the seismic data comprising P-P and shear mode data wherein the P-P data and shear mode data were both received at the towed single-component receivers configured to measure compressional P waves to generate the seismic data. The method further comprises processing the seismic data to extract SV-P shear mode data and generating shear mode image data based on the extracted shear mode data.


Patent No.: US 8,243,548 B2 [PDF]
Date of Patent: August 14, 2012

Title: Extracting SV Shear Data from P-wave Seismic Data

Inventors: Bob A. Hardage

Abstract
A system and method of processing seismic data obtained using a surface-based receiver configured to measure vertical movement of the Earth includes retrieving seismic data from a storage device, the seismic data comprising P-P and shear mode data. The P-P data and shear mode data were both received at a surface-based receiver configured to measure vertical movement of the Earth to generate the seismic data. The system and method further include processing the seismic data to extract the shear mode data and generating a shear mode image based on the extracted shear mode data.


Patent No.: US 8,164,979 B2 [PDF]
Date of Patent: April 24, 2012

Title: System and Method for Acquisition and Processing of Elastic Wavefield Seismic Data

Inventors: Bob A. Hardage

Abstract
A system and method of acquiring and processing full elastic waveform data from a vertical-force source comprises providing seismic waves into the earth from the vertical-force source, sensing reflections of the seismic waves at multicomponent geophones placed along the surface of the earth, and processing the reflections of the seismic waves to generate full elastic waveform data.


Patent No.: 8,040,754 B1 [PDF]
Date of Patent: October 18, 2011

Title: System and Method for Acquisition and Processing of Elastic Wavefield Seismic Data

Inventors: Bob A. Hardage

Abstract
A system and method of acquiring and processing full elastic waveform data from a vertical-force source comprises providing seismic waves into the earth from the vertical-force source, sensing reflections of the seismic waves at multicomponent geophones placed along the surface of the earth, and processing the reflections of the seismic waves to generate full elastic waveform data.


Patent No.: US 6,625,542 [PDF]
Date of Patent: September 23, 2003

Title: Determining Anisotropy in a Stratum using Scattered Vertical and Horizontal Shear Modes

Inventors: Bob A. Hardage and Robert J. Graebner

Abstract
The present invention provides a system for, and method of determining anisotrophy in a stratum using scattered horizontal shear and vertical shear modes. The method includes transforming seismic energy wave generated by a seismic energy source and received by seismic receivers into radial/transverse coordinate space, determining a seismic energy wave corridor along a radial path between the seismic energy source and the seismic receivers, and gathering seismic data received by the seismic receivers within the corridor wherein the data includes horizontal and vertical shear components.


Patent No.: US 6,564,150 [PDF]
Date of Patent: May 13, 2003

Title: System and Method for Orienting Seismic Energy Receivers to Yield Discriminated Vertical Shear Waves

Inventors: Allen L. Gilmer, Bob A. Hardage, and James L. Simmons

Abstract
A system for, and method of, orienting seismic energy sources and seismic energy receivers to substantially separate a compressional wave from a vertical shear wave. The method includes reflecting a seismic energy from a subsurface interface to produce a reflected seismic energy wave that has a compressional energy and vertical shear energy associated therewith. A first seismic energy receiver is oriented such that it is aligned with an angle of emergence of the reflected seismic energy wave to thereby maximize the vertical shear energy received by a second seismic energy receiver.


Patent No.: US 6,556,921 B1 [PDF]
Date of Patent: April 29, 2003

Title: Determining Vertical Fractures in a Stratum Using Scattered Vertical and Horizontal Shear Modes

Inventors: Bob A. Hardage and Robert J. Graebner

Abstract
The present invention provides a system for, and method of, determining vertical fractures in a stratum using scattered horizontal shear and vertical shear modes. The method may include segregating first order horizontal and vertical shear modes of a seismic energy wave into second order horizontal and vertical shear modes, defining a seismic energy wave corridor along a radial path between a seismic energy source and seismic receivers, and gathering seismic data received by the seismic receivers within the corridor, the data including the second order horizontal and vertical shear modes.


Patent No.: US 6,498,990 B2 [PDF]
Date of Patent: December 24, 2002

Title: System and Method for Orienting Seismic Energy Sources and Receivers to Yield Discriminated Horizontal and Vertical Shear Waves

Inventors: Bob A. Hardage, James L. Simmons, and Allen L. Gilmer

Abstract:
A system for, and method of, orienting seismic energy sources and seismic energy receivers to yield discriminated horizontal and vertical shear modes. In one embodiment, the system includes: (1) an initial matrix representing wave energy produced by a selected seismic energy source and received by a selected seismic energy receiver, (2) a first transforming matrix that cooperates with the initial matrix to orient the selected seismic energy source with respect to the selected seismic energy receiver, and (3) a second transforming matrix that cooperates with the initial matrix to orient the selected seismic energy receiver with respect to the selected seismic energy source, the initial matrix thereby transformed into a successive matrix containing the discriminated horizontal and vertical shear modes.


Patent No.: 5,907,132 [PDF]
Date of Patent: May 25, 1999

Title: Apparatus and Method for Illuminating 3-D Geologic Targets With P and S Wavelengths Generated by Explosives That Generate Directionally Controlled Force Vectors

Inventor: Bob A. Hardage

Abstract
Methods and apparatus for creating as shear ("S") wave for use in oil and gas exploration, where such S-wave is created by detonating an explosive packaging in a shot hole in a manner that produces directionally controlled S-wave force vectors at each source station across a 3-D survey grid.