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Anadarko Basin Study

Mid-Continent

CHARACTERIZATION AND EVALUATION OF ROCK MATRIX PROPERTIES FOR MAJOR PRODUCTIVE FORMATIONS (RED FORK, ATOKA, MORROW, SPRINGER, GODDARD) IN THE ANADARKO BASIN, OKLAHOMA AND TEXAS - Available in RAPID

Core Laboratories is offering a completed project entitled "Characterization and Evaluation of Rock Matrix Properties for the major Productive Formations (Goddard, Springer, Morrow, Atoka, Red Fork, and Granite Wash) in the Anadarko Basin, Oklahoma and Texas." The study addresses specific problems and questions related to mineralogy, diagenesis, petrophysical, and engineering properties of the Pennsylvanian section. Data and evaluations are provided to aid in the exploration of the six clastic units, with emphasis on an understanding of variations in reservoir quality due to porosity variations, and the relationship of reservoir characteristics to completion and stimulation practices.

Drill cuttings, conventional core, and core chips representing (101) wells were analyzed and interpreted. Data from all submitted wells were compiled into four (4) quarterly reports which were supplied to the member companies over the course of the study. Each quarterly report contains descriptions of the sandstones sampled for the different zones of interest along with a listing of sample intervals and their associated log response. Member companies also supplied drilling, completion and production histories. Where applicable, interpretations of depositional environments are given, with thin section and SEM analyses. Mineral composition was determined by X-ray diffraction analysis.

A two-volume final report was prepared that combines, correlates, and evaluates on a regional basis all the information provided in the quarterly summary reports. This includes microscopic re-examination of thin section samples and obtaining visual estimates of the principal granular and intergranular material. The mineral, textural, and pore space properties which control reservoir quality are given in the appendices in the final report.

From the large rock property database that was assembled, seven (7) major rock types were identified. Definitions of the rock types are based on detrital and diagenetic mineralogy, and the resultant pore space and reservoir quality properties. The rock types are presented in a catalog format to serve as reference analogs. Samples were also selected from conventional core material for cation exchange capacity (CEC) and capillary pressure tests (CPC).

The geological data, in combination with the petrophysical measurements, provide a better understanding of the rock types and their physical characteristics for each of the six (6) major units. Engineering recommendations are also supplied as a result of the evaluation and integration of these data and interpretations.

  • 101 wells
  • Conventional core, cuttings and core chips

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