ABSTRACT

Geographically, the Calhoun Field is located north of the center of the North Central Louisiana Oil and Gas Province. Production from the field is confined at this time to the Hosston formation of the Lower Cretaceous and the Schuler Formation of the Cotton Valley group, which is Jurassic in age. Regionally, it is on the eastern extremity of the Hosston and Cotton Valley trend, the Cotton Valley being in a somewhat down-dip position. Present production is exclusively gas and gas condensate. The Hosston produces from 2 to 3 barrels of condensate per million, while the individual Cotton Valley sands vary from 2.5 barrels per million in the Bodcaw to 318 barrels of condensate per million in the Cadeville.

The Calhoun structure is a large anticline with individual Hosston sands exhibiting various characteristics; some continue over the structure, others develop on one flank or the other around the structure, and some appear to occur on or near the apex of the anticline. The Cotton Valley sands carry with good continuity over the structure. Accumulation from these sands is dependent on porosity and permeability. In general, the porosity and permeability is better developed on the north and west flanks except the "D" Sand, which exhibits some porosity and permeability on top of the structure.

A total of thirty-six wells has been drilled, resulting in thirty-three producing wells, two shut-in wells, and one dry hole. Of the producing wells, twenty-two are single completions, four are dual completions, and seven are triple completions. Units are 640-acre governmental sections for all producing reservoirs except the Cadeville, which is on a 320-acre one-half section unit, all force-pooled by the Louisiana State Conservation Department.