This task is led by Dr. Stephen Kaczmarek (www.researchdolomite.com/ ) at Western Michigan University to bring together lithological, mineralogical, and geochemical (bulk and micro) data from identified confining units relevant for assessing textural and compositional heterogeneity, and thus identify potential reactivity of injected fluids. A detailed petrographic characterization of samples will be completed using thin section petrography (TSP), scanning electron microscopy (SEM), powder x-ray diffraction (XRD), x-ray fluorescence (XRF), and SEM-energy dispersive spectroscopy (SEM-EDS). These analytical data will be integrated with existing core descriptions using physical core and cuttings currently in the Michigan Geological Repository for Research and Education (MGRRE) database. 

This task is led by Dr. Natalia Zakharova (www.cmich.edu/people/NATALIA-ZAKHAROVA ) at Central Michigan University to measure geomechanical properties (rock strength, acoustic velocities, elastic moduli, and fracture toughness), evaluate their relationship to lithological and mineralogical parameters, and assess geomechanical heterogeneity for various types of confining units. Measurements and their analysis will be conducted using the new-generation scratch test equipped with high-resolution camera, laser scanner, and acoustic velocity measurements.

The rock fracture strength, computed from the forces applied on the scratch blade to achieve certain depth of cut, will be verified and, if needed, calibrated by independent point measurements using standard triaxial testing protocols, to assure accurate conversion to unconfined compressive strength (UCS). The dynamic elastic moduli will be computed from acquired acoustic velocity. The anisotropy of various mechanical properties will also be evaluated by performing the scratch test in different directions.

This task is led by Amber Conner (MGRRE) to compile existing data and information with new data and findings from other tasks, to develop first-of-a-kind detailed maps of major confining units in Michigan. The maps will be used to identify areas of higher risk and validate areas of high-quality sealing properties. The task will develop screening strategies to rank and compare sites.