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McDonald (Devonian) field, north-central Lea County, New Mexico, is an excellent example of the type of deep structure generally found in the Tatum basin, that is, small size, difficult to isolate with seismic, but lucrative when found, producing up to 1.0 million bbl of oil per well. Production is from Devonian rocks, with secondary Pennsylvanian (Atokan) gas potential. Variations in thickness from well to well of Pennsylvanian and Mississippian stratigraphic equivalents provide insight into the complex structural history of the field. McDonald-sized features are most likely to be discovered only by employing a closely integrated exploration program that includes all geophysical and geological parameters.
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