ABSTRACT

The discovery of gas production in the Smackover "C" Sand in the East Dykesville field of Claiborne and Webster Parishes, Louisiana in 1980, extended the productive limits of this reservoir 6 mi (10 km) south of the production in the Haynesville Field. The development of this field has revealed three productive fault blocks within an area 6 mi (10 km) by 3 mi (5 km).

The Smackover "C" Sand of East Dykesville occurs 700 ft (213 m) above the Louann Salt as a portion of a more or less continuous sand body covering an area 9 mi (15 km) from east to west, and extends southward from the Arkansas-Louisiana state line for more than 10 mi (16 km). This is the same body of sandstone which produces at the Haynesville field. Production has been encountered in the "C" Sand at East Dykesville from 10,912 ft (3326 m) subsea down to 11,605 ft (3537 m) subsea, an interval of 693 ft (211 m).

The source of the sediments which constitute the Smackover "C" Sand appears to be north of the sand body as it attains more than 100 ft (31 m) thickness in the Red Rock-Haynesville area and thins southward. The sand also thins both to the east towards Haynesville and to the west towards Shongaloo. The "C" Sand is 60 ft (18 m) thick in the north portion of East Dykesville field and thins to 20 ft (6 m) in the southern-most wells. Isopachus studies suggest a submarine fan depositional environment on a stable shelf.