Part 4 - Berg - Hughes Center

Lake Anhydrite was deposited above the Rodessa in an extensive lagoonal sea. It is
believed that the thickness of individual beds accumulating within the lagoon were
controlled mainly by water depth, development of a restrictive barrier, subsidence,
duration of each evaporative pulse, and areal salinity variation (Forgotson, 1957; Pittman,
1985). The Ferry Lake is described as consisting of white to gray, finely crystalline
anhydrite that contains minor amounts of interbedded gray to black shale, dense
limestone, and dolomite. The type well is the Gulf Refining Company's Gas Unit No. 1,
in Jeems Bayou Field, Caddo Parish, Louisiana, with the top placed at 3,823 ft and the
base 4,072 ft.
Only minor production has been reported to date from fractured intervals within the
Ferry Lake Anhydrite from scattered fields within the interior salt basins. Kimball et al.
(1989) described hydrocarbon production in Caddo-Pine Island field from the thin
Haygood Limestone, found near the base of the Ferry Lake Anhydrite. The high
resistivities of the anhydrite beds require the use of porosity logs such as sonic logs,
micrologs, or neutron density logs, in order to adequately evaluate the formation. Where
production has been found, pay depths range from 3,000 to 4,000 ft. Net pay is only 20 to
50 ft thick with minor porosity and low permeability.
Mooringsport Formation
Producing Parishes
Caddo, Bossier, De Soto
Red River
The Mooringsport Formation (early Albian age) consists of shallow marine
carbonates that are predominantly crystalline and fossiliferous limestone interbedded
with sandstone, red beds, anhydrite, and shale (Yurewicz et al., 1993). It is located above
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