ABSTRACT:

The Arbuckle group is a major geologic formation that is widely distributed in subsurface Oklahoma and Kansas. Understanding the geomechanical and petrophysical properties of the rock materials from these layers is of much interest for CO2 storage, salt water disposal, and injection induced seismicity problems. In this paper, we present some results of a geomechanical characterization effort to determine the rock mechanical properties of the Arbuckle Group and its bounding formations. Static and dynamic elastic modulus and Poisson’s ratio, shear strength, friction coefficient, and cohesion have been measured. The unconfined compressive strength (UCS) and Mohr-Coulomb failure envelop also have been estimated for every tested specimen. In addition, mechanical anisotropy of the rocks has been evaluated using both dynamic and static laboratory measurements. Furthermore, natural fracture properties have been measured under triaxial conditions. The characterizations of the rock mechanical properties of the Arbuckle group provide valuable data for ongoing numerical modeling of CO2 storage and seismicity in Oklahoma.

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