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. The Viola can be subdivided into three units with characteristics similar to the Bois d'Arc, Henryhouse-Haragan, and Chimneyhill members of the Hunton. 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 zones, but virtually untested for Viola. The ost active

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trend to develop has been along the north flank of the Marietta basin in southern Oklahoma. There has been great interest in the Viola on both sides of the Arbuckle Mountains, and in a new discovery along the complex mountain front province of the Anadarko basin. In addition, there are numerous OWWO attempts 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 some special treatments for paraffin and other impurities. To date, no H₂S has been encountered. The future of Viola development across large parts of Oklahoma is excellent with some very promising trends still untested.

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