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Emerging Plays

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By Nissa Darbonne, Hart Energy
January 9, 2014

Not so long ago—in geologic terms—a sea that covered much of the western U.S. had a shoreline in New Mexico where the rock was named Gallup sandstone in the past century; the delta mud that encased it at this southern edge of the modern San Juan Basin was named Mancos shale. In time, oil and gas that were cooked in the fine-grained, Cretaceous-age shale intervals have migrated into the less-tight sandstone.

And that makes a play.

“When we pressure-pump our frac stimulation into it, we have a shale above us ...


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