Abstract
Oil and gas production in the E. portion of the San Juan Basin is confined to Rio Arriba and Sandoval counties with by far the major portion coming from Rio Arriba County. Most of the dry gas produced in San Juan Basin occurs in stratigraphic reservoirs in the Pictured Cliffs Sandstone, Mesaverde Group, and Dakota Formation all of Upper Cretaceous age. Minor amounts of dry gas are produced from sand and coal zones in the Fruitland Formation, in what has been designated as the Chacra Formation and from the Gallup Sandstone. Rio Arriba and Sandoval County gas production is confined to the above listed formations; although, in the W. part of the basin additional gas has been found in the Farmington Sandstone and in Pennsylvanian, Mississippian, and Devonian strata. In Rio Arriba County, oil is produced from several Gallup zones, from fractured zones in the Mancos Shale on the extreme E. edge of the basin, from the Dakota Formation in Southern Rio Arriba County and from the Mesaverde Group in small areas south of the Blanco Mesaverde Gas Pool. Sandoval County also produces a small amount of oil from the Mesaverde Group, Gallup Sandstone, Dakota Formation, and the Entrada Sandstone.
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