Abstract

The Viola limestone as a potential hydrocarbon source has been recognized for years in the literature, but only in the last couple of years has the industry actively pursued this target as a primary reservoir. The Viola is stratigraphically similar to the Hunton Formation and produces from both fracture porosity and primary porosity zones. Little formation water has been encountered and the higher prices for crude oil have made economic entire trends heretofore left undeveloped. Some of these trends are untested at any horizon, and others are thoroughly tested for the shallower and/or deeper zones, but virtually untested for Viola. The most active trend to develop has been along the north flank of the Marietta Basin in southern Oklahoma. There has been a great deal of Viola interest on both sides of the Arbuckle Mountains, and a new discovery along the complex mountain front province of the Anadarko Basin. In addition, there are numerous OWWO attempts ongoing along the southern end of the Central Oklahoma Platform.

Few wells in the Viola have the capability to produce without large frac treatments, and some require special treatments and some require special treatments for paraffin and other impurities. To date no H₂S has been encountered. The future of Viola development across large portions of Oklahoma is excellent with some very promising trends existing along the north flank of the Ardmore Basin, the north flank of the Anadarko Basin, and the mountain front complex of the Anadarko Basin.