The Ignacio gas field, a closed anticline in the northeastern lobe of the San Juan basin, has two proved commercially productive zones; one, the Fruitland-Pictured Cliffs, the other in the Dakota-top of the Morrison. Porosity and permeability are the controlling factors in the Fruitland-Pictured Cliffs reservoir, whereas fracturing in the Dakota-top of the Morrison reservoir is of primary importance.

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