Part 4 - Berg - Hughes Center

2.65-MMcf gas/day and 459 bbls of 45.8° API oil on an 11/64-inch choke, with a tubing
pressure of 2,409 lb. and a gas/oil ratio of 5780 cf/bbl. Finally, in January 1966,
commercial production in Black Lake field began after 24 years of drilling activity.
Hermann (1971) mentions that after the successes of Black Lake field only minor
production occurred in the Sligo in northern Louisiana.
Lower Cretaceous Comanche/Trinity (Pine Island, James, Rodessa, Ferry Lake,
Mooringsport)
Pearsall Formation
According to Forgotson (1963), the Pearsall Formation is the lowest of the units of
the Lower Cretaceous Trinity Stage. In southern Arkansas, north Louisiana, and east
Texas, it is subdivided, in ascending order, into the basal Pine Island Shale, the James
(Cow Creek) Limestone, and the Bexar Shale. In Louisiana, these members are
nearshore, sandy facies along the updip margin of deposition and cannot be subdivided.
The Rodessa, Ferry Lake, and Mooringsport formations overlie the Pearsall. The Rodessa
and Mooringsport comprise separate platform sequences. Anhydrite beds occur
throughout the Rodessa. The Ferry Lake Anhydrite reflects a regional episode and is used
as a marker bed throughout the northern Gulf (Petty, 1995; Montgomery et al., 2002).
Pine Island Formation
Producing Parishes
Lincoln, Ouachita
The Pine Island consists predominantly of calcareous black shale with interbedded
fine-grained sandstone and minor crystalline limestone layers associated with lagoonal to
nearshore marine environments. The widespread nature of the marine shales of the Pine
Island is interpreted by Yurewicz et al. (1993) as regional transgressive deposits. The
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