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MRCSP Phase I Geologic Characterization Report - Midwest ...

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

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Figure A4-2.—Figure showing difference in interpretation of the Rose Run sandstone between Ohio and Kentucky based on geophysical log picks. The basal<br />

sand unit of the Rose Run sequence as mapped in Ohio and Pennsylvania, is not present, or poorly developed, in Kentucky. Therefore, the Kentucky thickness<br />

map cannot be merged with the Ohio thickness map as can be seen on Figure A4-3.<br />

pores; 2) oversized pores; 3) moldic pores; 4) intraconstituent pores;<br />

and 5) fractures (Riley and others, 1993). Intergranular porosity is<br />

the most abundant porosity type in the Rose Run and appears to be<br />

mostly secondary based on corroded grain boundaries. Oversized<br />

pores are caused primarily by dissolution of dolomite and feldspar.<br />

Moldic pores occur in the more feldspathic samples and have the<br />

highest porosities and permeabilities. Intraconstituent pores occur<br />

most commonly in feldspar grains and appear to be more common<br />

toward the lower portion of the Rose Run. Fracture porosity is the<br />

least common porosity type observed in cores, but it may be locally<br />

significant in areas adjacent to major fault systems.<br />

DISCUSSION OF DEPTH AND THICKNESS RANGES<br />

Regional structure on the top of the Rose Run sandstone exhibits<br />

dip to the east and southeast with strike trending northeast-southwest<br />

(Figure A4-4). Subsea elevations range from 390 feet in northcentral<br />

Kentucky to 18,900 feet in south-central Pennsylvania. Dips

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