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The Mathers Ranch field in Hemphill County, Texas, represents another major discovery of gas reserves from the Siluro-Devonian Hunton limestone in the Anadarko basin of Oklahoma and Texas. It is the seventh significant Hunton field discovered in the deep Anadarko basin and is the result of continued exploratory drilling for Hunton and deeper objectives in the Cambro-Ordovician. Mathers Ranch field has more than 10 wells completed and the field limits are not yet defined in any direction. The discovery lies on a south-plunging structural nose transected by east-west faulting which, coupled with north dip, contributes structural entrapment. The degree to which porosity development is important as an entrapment agent is not yet defined and may be as important as structure, o even more so when the field is outlined completely by drilling. Production comes from below 17,000 ft from both intergranular and fracture porosity.
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