Integrated Petrographic, Core and Log Analysis

The purpose of our evaluation is to develop a comprehensive understanding of the reservoir. Objectives include:

  • Understanding the performance potential of the reservoir from determination of the rock’s petrophysical properties (GPAC analysis). This data set is integrated with core analysis results (if available)
  • Identification and detailed description of the various “rock types” present over the intervals of interest to help characterize variabilities in performance and recovery efficiency.
  • Characterizing the pore system including definition of the amounts of primary, secondary, and micro porosity present and the types and amounts of clays present to better assess cutoff values and expected recovery efficiency.
  • Defining pore geometrical factors that may effect wireline log response for improved log interpretation and understanding of fluid distribution
  • Defining the depositional setting and how this relates to quality, size, shape, and orientation of the various reservoir layers
  • Defining the predominant controls on reservoir quality and how these factors related to the spatial distribution of reservoir quality rock.
  • Understanding attributes of the formation that may cause sensitivities to drilling, completions and stimulation strategies and to outline methodology to use to minimize formation damage and maximize the reservoir’s productive potential.

This interpretation integrates the results of the petrographic analyses with the results of routine & special core analysis (if available) and log response characteristics. Log responses are calibrated to rock mineralogy and lithology, and optimum algorithms are derived for determination of Vshale and effective porosity from wireline logs. Electrical property values for each defined “rock type” as derived from GPAC analysis (or measured values from core analysis) are utilized in saturation modeling to assist in the determination of expected formation producibility and type of fluid production. All other factors effecting log interpretation and producibility are documented and applied to the log solutions derived as part of this analysis. The report also includes a prediction of formation sensitivity to various completion fluids, recommendations on perforation density, optimum fluid composition, and proper additives to use.  If required, gravel pack design recommendations are included. Reported results include a complete description and geological interpretation of the reservoir rock, including diagenesis, mineralogy by tabulated point count and X‑ray diffraction data, measured grain size in thin section, and elemental composition (SEM-EDS) in weight percent. The methods used include a quantitative determination of rock lithology, mineralogy, texture, pore system, clays and other sensitive minerals. Deliverables also include shale volume, shale distribution, clay abundance, clay types, grain density, estimation of permeability from GPAC analysis (for percussion sidewall cores and cuttings) and a qualitative evaluation of reservoir quality. The report also includes color thin section and black and white SEM photomicrographs of each sample. Interpretation can be provided within completion timeframe to assist with completion decisions. Data derived is utilized to perform log analysis with resulting log solutions provided as part of the data output.

Contact GeoSystems

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

Email: info@geosystemsllp.com