Patents by Inventor David M. Marschall

David M. Marschall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for using conventional core data to calibrate bound water volumes derived from true vertical depth (TVD) indexing, in a borehole, of capillary pressure and NMR logs
    Patent number: 6833699
    Abstract: Disclosed are a method and system for developing customized bound water transformations to obtain accurate determinations of non-producible water from nuclear magnetic resonance (NMR) logs. The approaches of this invention can be applied for in situ calibration where laboratory NMR measurements may not be possible or practical. In particular, a transformation model directly linking BVI and capillary pressure is developed by calibrating NMR derived BVI with the core data, the novel transformation model utilizes SBVI and/or CBVI models to directly relate NMR derived BVI and capillary pressure responses through the height of the measurement in a borehole. The derived height-based BVI transformation model is applied to the NMR log of the borehole to quantify non-producible water in the NMR log.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: December 21, 2004
    Assignee: Halliburton Energy Services, Inc.
    Inventors: James E. Galford, David M. Marschall
  • Method and system for using conventional core data to calibrate bound water volumes derived from NMR logs
    Publication number: 20030094946
    Abstract: Disclosed are a method and system for developing customized bound water transformations to obtain accurate determinations of non-producible water from nuclear magnetic resonance (NMR) logs. The approaches of this invention can be applied for in situ calibration where laboratory NMR measurements may not be possible or practical. In particular, a transformation model directly linking BVI and capillary pressure is developed by calibrating NMR derived BVI with the core data, the novel transformation model utilizes SBVI and/or CBVI models to directly relate NMR derived BVI and capillary pressure responses through the height of the measurement in a borehole. The derived height-based BVI transformation model is applied to the NMR log of the borehole to quantify non-producible water in the NMR log.
    Type: Application
    Filed: September 19, 2002
    Publication date: May 22, 2003
    Applicant: Halliburton Energy Services, Inc.
    Inventors: James E. Galford, David M. Marschall
  • Method for identifying and characterizing hydraulic units of saturated porous media: tri-kappa zoning process
    Patent number: 5193059
    Abstract: The present invention is a method of logging a formation for permeability using a logging tool that is calibrated to dynamically correlate macroscopic porosity measurements to microscopic permeability measurements for the formation. The correlation is determined from hydraulic unit characterization factors which are calculated from parameters of the formation determined in an analysis of core material taken from the hydraulic units determined to be in the geologic units. The hydraulic units are identified from the relationship of direct permeability and porosity measurements with calculated hydraulic unit characterization factors for the formation.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: March 9, 1993
    Assignee: Western Atlas International Inc.
    Inventors: Djebbar Tiab, David M. Marschall, Mehmet H. Altunbay