Abstract: The 3D Seismic Rejuvenation of Roleta Field, Zapata County, Texas

CASSETTA, DOMINICK
Union Pacific Resources Company

Post-3D wells drilled by Union Pacific Resources on its Roleta Field acreage have more than quintupled gas production volumes from 9 MMCFD to 52 MMCFD, which is more than triple the field's pre-3D production rate of about 15 MMCFD. Production at Roleta occurs mainly in Middle to Upper Wilcox geopressured tight gas sands at depths from 7,000 ft to 10,000 ft. The western portion of the acreage is submerged beneath

Falcon Reservoir and had minimal pre-3D production. The acquisition of twenty square mi of land and lake 3D resulted in the identification of 33 drillsites. The economics of tight gas sand drilling on partially submerged lands as at Roleta are enhanced by the technological synergism of 3D combined with directional drilling, modern frac stimulation, cost-efficient completions, and commingling of productive zones. As a result of these efforts the EUR for this property has doubled from a pre-3D figure of 62 BCF to a post-3D value of 124 BCF.

AAPG Search and Discovery Article #90932©1998 GCAGS/GCS-SEPM Meeting, Corpus Christi, Texas