Laboratory Services

In conjunction with our reservoir characterization services, GeoSystems provides these petrographic services “in-house”:

General Thin Section Analysis

This analysis includes a basic petrographic description, including visual estimation of grain size, sorting, porosity and mineral abundances, fabric, rock classification, porosity varieties and abundances. Two (2) color photomicrographs of each sample with complete written descriptions are included.

Detailed Thin Section Analysis

Detailed thin section analysis includes measurement of mean grain size, sorting, and point count determination of mineral abundances and porosity  (minimum 300 points per thin section). Results include a determination of Vshale, shale distribution, porosity varieties and abundances with a discussion of diagenesis, diagenetic sequence, porosity origins and development, controls on porosity and permeability. Point count data is presented in tabular form with two (2) color photomicrographs accompanied by detailed photomicrographs descriptions.

GPAC Analysis (GeoSystems Pore Attribute Characterization)

GeoSystems’ use of backscatter imaging (BSE) techniques using a scanning electron microscope on ultra polished billets 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 BSE on ultra polished billet and SEM photomicrograph on fresh surface. Data 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

Scanning Electron Microscopy/Energy Dispersive Analysis

The data output includes two (2) photographs at varying magnification documenting significant rock properties, pores, pore throats, clays, framework grains and cements. Deliverables include a complete written description, and elemental abundance from EDS analysis.

X‑Ray Diffraction Analysis

XRD analysis provides semi-quantitative determination of sample mineralogy.  Bulk and clay X-ray diffraction analysis is performed to aide in reservoir description and evaluation of reservoir diagenesis.  The data provided in tabular format.

Grain Size Analysis

Grain size distribution is determined from thin section point count (100 grains), along with recommendations for gravel pack design. Results non-effected by grain fracturing during sample recovery.

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

Email: info@geosystemsllp.com