MRCSP Phase I Geologic Characterization Report - Midwest ...

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200 134 CHARACTERIZATION OF GEOLOGIC SEQUESTRATION OPPORTUNITIES IN THE <strong>MRCSP</strong> REGION EXPLANATION 200 ft Index contours 40 ft contours Thickness in feet 560 80 200 200 400 200 400 20 10 0 20 40 Miles 20 10 0 20 40 60 Kilometers ³ Figure A16-2.—Map showing the thickness of the Saginaw Coal.
APPENDIX A: LOWER CRETACEOUS WASTE GATE FORMATION 135 Much of the stratigraphy and lateral extent of the Saginaw Formation and other Pennsylvanian-age rocks in Michigan is poorly known because the majority of the data available on this interval consists of limited drill-hole logs and records. However, down-hole, log-based studies of thickness and distribution trends of coals in the Pennsylvanian may be feasible using available log data, gamma-ray, resistivity, neutron-porosity, and density logs (Vugrinovich, 1984). However, these studies are restricted mostly to the deeper portions of the central Michigan basin (Figure A16-1). Other feasible sequestration targets within Pennsylvanian rocks could include organicrich, carbonaceous shale, a significant but, as yet, unquantified reservoir for CO 2 sequestration. 17. LOWER CRETACEOUS WASTE GATE FORMATION The Waste Gate Formation of the Potomac Group (Delaware, Maryland, New Jersey, and Virginia) is a stratigraphic unit that includes a correlative sequence of subsurface strata underlying the eastern Delaware-Maryland-Virginia (“Delmarva”) Peninsula that are significantly different in age, lithology, and petrophysics from the Patuxent Formation. In the type area, the Potomac Group is divided into formations but, in many places, the formations are less distinct lithologically, and one or more formations, or even the entire group, is treated as an undivided unit. The Waste Gate beds were previously considered part of the Lower Cretaceous Potomac Group (undivided) or the lower part of the Patuxent Formation. A diagram showing the stratigraphy as proposed by Hansen (1984) is provided as Figure A17-1. The Potomac Group is a largely non-marine fluvial-deltaic complex of interbedded sandstones and mudrocks that generally dips and thickens eastward toward the Atlantic Ocean. While the Waste Gate Formation is limited to the subsurface primarily under the Delmarva Peninsula, the younger units of the Potomac Group crop out updip, west of the Chesapeake Bay and in the northernmost part of the Delmarva Peninsula (Figure A17-2). The Potomac Group pinches out altogether at the Fall Line or Fall Zone, which is the boundary between the Piedmont Province and the Coastal Plain Province, and across which rivers from the upland (Piedmont) region drop as rapids or falls to the Coastal Plain (Figure A17-3). Hansen (1982, 1984) reported that basal beds (i.e., Waste Gate Formation) decrease in thickness in an up-dip direction, northwestward toward the Baltimore-Washington corridor, and that the upper part of this sequence is marked by an unconformity. This places the Late Cretaceous Magothy Formation on top of the Potomac Group (Figure A17-1). The Waste Gate Formation is fairly limited in extent. Hansen (1984) indicateed that the Waste Gate occurs beneath the southeastern part of the Delmarva Peninsula, including the southeastern portion of Maryland’s eastern shore and the northern part of Virginia’s eastern shore. The unit probably underlies part of southeastern Delaware, and possibly may extend at least as far north as the southern tip of New Jersey. Hansen has also indicated that, offshore of New Jersey, there are partially coeval units, including some non-marine, feldspathic sandstones and shales as well as limestones, calcareous shales, and limy sandstones. The relationship between these units in offshore wells and the Waste Gate (as identified in onshore wells) is not fully Figure A17-1.—Stratigraphy of the Potomac Group beneath the eastern Delmarva Peninsula (from Hansen, 1984).
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Characterization of Geologic Seques
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ABOUT THE MRCSP The Midwest Regiona
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CONTENTS About the MRCSP ..........
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CONTENTS Figure A14-2.—Structure
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1 CHARACTERIZATION OF GEOLOGIC SEQU
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BACKGROUND INFORMATION 3 (a minimum
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INTRODUCTION TO THE MRCSP REGION’
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GEOLOGIC MAPPING PROCEDURES, DATA S
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OIL, GAS, AND GAS STORAGE FIELDS 27
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CO 2-SEQUESTRATION STORAGE CAPACITY
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CONCLUSIONS AND REGIONAL ASSESSMENT
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REFERENCES CITED 47 National Confer
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49 APPENDIX A Geologic Summaries of
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APPENDIX A: PRECAMBRIAN UNCONFORMIT
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APPENDIX A: CAMBRIAN BASAL SANDSTON
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APPENDIX A: BASAL SANDSTONES TO TOP
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APPENDIX A: UPPER CAMBRIAN ROSE RUN
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APPENDIX A: KNOX TO LOWER SILURIAN
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N T R APPENDIX A: KNOX TO LOWER SIL
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APPENDIX A: MIDDLE ORDOVICIAN ST. P
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Page 105 and 106: A APPENDIX A: NIAGARAN/LOCKPORT THR
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Page 125 and 126: 25 APPENDIX A: LOWER/MIDDLE DEVONIA
Page 127 and 128: APPENDIX A: DEVONIAN ORGANIC-RICH S
Page 135 and 136: ( ( ( ( APPENDIX A: PENNSYLVANIAN C
Page 137 and 138: APPENDIX A: PENNSYLVANIAN COAL BEDS
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Page 151 and 152: APPENDIX A: REFERENCES CITED 143 Sa
Page 153 and 154: APPENDIX A: REFERENCES CITED 145 an
Page 155 and 156: APPENDIX A: REFERENCES CITED 147 lo
Page 157 and 158: APPENDIX A: REFERENCES CITED 149 Pa
Page 159 and 160: APPENDIX A: REFERENCES CITED 151 Th
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MRCSP Phase I Geologic Characterization Report - Midwest ...

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