Lower Potomac Group, Eastern Coastal Plain (12a)

Comments on Geologic Parameters

12a CO2 Solubility Brine: Formation Temperature:

Trapp and others (1984) and Hansen (1984) provided temperature versus depth information from deep wells in the coastal plain of Maryland. Both studies determine a normal geothermal gradient of about 1.5 °F/100 ft. This compares well with the geothermal gradient data of Kinney (1976) in which a geothermal gradient of about 1.38 °F/100 ft (25.5 °C/km) is shown for the eastern New Jersey, Delaware, and Maryland coastal-plain area.

12a Reference:

Hansen, H. J., 1984, Hydrogeologic characteristics of the Waste Gate Formation, a new subsurface unit of the Potomac Group underlying the eastern Delmarva Peninsula: Maryland Geological Survey Information Circular 39, 22 p.

Trapp, H., Jr., Knobel, L. L., Meisler, H., and Leahy, P. P., 1984, Test well DO-CE 88 at Cambridge, Dorchester County, Maryland: U.S. Geological Survey, Water-Supply Paper 2229, 48 p.

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