A simple microscopic determination of the surface texture of a reservoir rock provides a ready and reliable means of evaluating its reservoir-performance properties. Results of standard laboratory tests for the porosity, permeability, and pore size distribution of some 2,000 samples of sandstone and carbonate rock were matched with types of rock surface textures, as determined by polished section-binocular microscope examination, and an empirical correlation was established between reservoir properties and visual rock characteristics. Some surface-texture characteristics are reviewed, common types of sandstone and carbonate rock are listed and discussed, and correlations are tabulated.

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