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Carbonates and Evaporites

, Volume 2, Issue 2, pp 95–100 | Cite as

Substitution of simulated well-cuttings for core plugs in the petrophysical analysis of dolostones: Permian San Andres Formation, Texas

  • Swapan K. Ghosh
  • Stephen F. Urschel
  • Gerald M. Friedman
Articles

Abstract

Petrophysical data on heterogeneous dolostone rocks of the San Andres Formation (Permian) of West Texas were obtained using a mercury porosimeter from two kinds of samples: (a) cylindrical core plugs and (b) chips (simulated well-cuttings). In both kinds of samples, dolomitized oolitic grainstones and dolomudstones showed characteristics of good reservoir rocks (medium to large, uniform-sized pore throats, and a high percentage of available pores). Data from both plug and chip samples yielded comparable capillary-pressure curves defining the tight caprock facies and locating the top of the porosity zone in the dolomudstone. Petrophysical data derived from plugs and chips are similar because micron-sized throats which control capillary effects are not affected by sampling processes. The experiments suggest that well-cuttings, which are inexpensive to collect, can provide representative samples for characterization of reservoir facies in the thick, heterogeneous carbonate sequence of the San Andres. Well-cuttings therefore deserve more attention as an alternative sampling material, especially in reservoirs where cores are not available.

Keywords

Capillary Pressure Petrophysical Property Brooklyn College Core Plug Mercury Porosimeter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1988

Authors and Affiliations

  • Swapan K. Ghosh
    • 1
    • 2
  • Stephen F. Urschel
    • 1
    • 2
  • Gerald M. Friedman
    • 1
    • 2
  1. 1.Department of GeologyBrooklyn CollegeBrooklyn
  2. 2.Northeastern Science Foundation (affiliated with Brooklyn College of the City University of New York)Rensselaer Center of Applied GeologyTroy

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