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MRCSP Phase I Geologic Characterization Report - Midwest ...

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124 CHARACTERIZATION OF GEOLOGIC SEQUESTRATION OPPORTUNITIES IN THE <strong>MRCSP</strong> REGION<br />

In the Appalachian basin, the primary gas producing area extends<br />

from eastern Kentucky, across central West Virginia, into eastern<br />

Ohio and through northwestern Pennsylvania (Figure A14-5). In<br />

the Michigan basin, Antrim Shale production is most prolific in an<br />

eight-county area across northern lower Michigan (Figure A14-5).<br />

The Devonian shale interval should also prove to be a most effective<br />

seal for sequestering CO 2 in stratigraphically lower reservoirs.<br />

Their great thickness and low permeability will inhibit movement<br />

upwards through the shale, especially in non-fractured areas. In addition,<br />

the ability of organic-rich shales to adsorb CO 2, as discussed<br />

above, may be a seal benefit by “soaking up” any CO 2 that may<br />

migrate from other reservoirs.<br />

Figure A14-4.—Type log from the Big Sandy gas field in eastern Kentucky<br />

illustrating the alternating black (high gamma-ray, greater than 280 API<br />

units) and gray (low gamma-ray) shales.

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