--> Abstract: Petrophysical Characteristics and Facies Distribution of Reservoir and Non-reservoir Rocks from the Anadarko Basin, Oklahoma; #90063 (2007)

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Petrophysical Characteristics and Facies Distribution of Reservoir and Non-reservoir Rocks from the Anadarko Basin, Oklahoma

 

Cranganu, Constantin1, Maria A. Villa2 (1) Brooklyn College of the City University of New York, Brooklyn, NY (2) Occidental Petroleum Corporation (OXY), Colombia, Bogota, Colombia

 

Using mercury intrusion porosimetry technique we analyzed 103 samples taken from the reservoir and non-reservoir rocks of the Anadarko Basin, Oklahoma. The samples are mainly sandstones, shales, and carbonates, ranging in age from Devonian to Permian and in depth from 404 m to 4,975 m. The objectives of this research are to (1) develop a classification of capillary-pressure curves; (2) establish criteria for identifying petrophysical facies based on capillary-pressure curves; and (3) assess the facies distribution of reservoir and non-reservoir rocks.

 

The petrophysical parameters used in this study are: median pore throat radius, average pore throat radius, bulk density, apparent skeletal density, apparent porosity, maximum threshold-entry radius (MTER), displacement pressure, entry pressure, pore throat size distribution, pore throat type, and pore throat sorting (PTS). In addition, capillary-pressure curves are classified into six categories based on their shape. The quality of reservoir rocks was estimated using a permeability/porosity plot. Finally, statistical analysis was used to assess correlations between various petrophysical parameters.

The main results are: for reservoir rocks, 38 samples have unimodal pore throat size distribution, 21 samples have bimodal distribution, and 4 do not exhibit any mode distribution; for non-reservoir rocks, 19 samples have unimodal distribution and 21 samples have bimodal distribution. PTS varies between moderate and poor for the reservoir rocks and is predominantly poor for non-reservoir rocks. MTER for unimodal pore throat distribution ranges between 0.0034 – 0.7704 microns for reservoir rocks and 0.0034 – 0.0224 microns for non-reservoir rocks. In this study we demonstrated the links between petrophysical characteristics and facies distribution of reservoir and non-reservoir rocks from the Anadarko Basin, Oklahoma.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California