Abstract
ABSTRACT Petrophysical (rock and reservoir) properties of Mesaverde strata in northwestern Colorado change significantly with variations in both lithology and depositional environment. The Mesaverde Group at the U.S. Department of Energy's Multiwell Experiment site contains strata that were deposited in shallow marine, lower and upper delta plain, and fluvial environments. The detrital compositions of the original sands in these environments were similar, but differing depositional and diagenetic modifications produced zones of differing sandstone mineralogy and texture. Different mineralogies in turn cause significant differences in reservoir porosities and permeabilities, and in rock properties such as Young's modulus, Poisson's ratio, fracture toughness, capillary pressure, and compressive and tensile strength.
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