GeoSystems Pore Attribute Characterization
(GPAC analysis)

This analysis technique allows for the development of petrophysical properties on cutting and percussion sidewall cores where these measurements cannot be accurately made. This analysis significantly enhances the overall information derived from these type of rock samples. When integrated with thin section and X-ray diffraction analysis, improved understanding of reservoir potential is achieved.

This analysis involves the use of backscatter imaging techniques using a scanning electron microscope on ultra polished billets. It is a unique approach that allows for a study of the pore system at much higher levels of magnification than can be obtained from performing this analysis on thin sections.  Analysis requires BSI on ultra polished billet and SEM photomicrograph on fresh surface. Data results are presented in both tabular and graphical formats and includes:           

  • Porosity*
  • Porosity distribution (percent primary intergranular and micro porosity)*
  • Permeability
  • Pore size distribution*
  • Mean pore body diameter (ferret diameter)*
  • Mean pore throat diameter*
  • Mean aspect ratio**
  • Average coordination number
  • Pore shape factor**
  • Capillary pressure curves**
  • Formation factor ("m")**
  • T-2 distribution plot**

* These are actual measured values
** Mathematically derived values

*** Requires SEM analysis in conjunction with GPAC analysis

Contact GeoSystems

logoGeoSystems LLP
1410 Stonehollow Drive,
Kingwood, Texas 77339
Phone: 281-358-2662
Fax: 281-358-3276

Email: info@geosystemsllp.com