Part 4 - Berg - Hughes Center
Part 4 - Berg - Hughes Center
Part 4 - Berg - Hughes Center
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productive in east-central Louisiana and adjoining southwest Mississippi (Echols, 1991).<br />
Echols (1991) estimated that over one billion barrels of oil remains in place for this area.<br />
The reservoirs are unstructured deltaic facies. The North Louisiana Salt Basin is filled<br />
with about 3,600 ft of deltaic sediments of the Wilcox Group, which is subdivided into<br />
upper, middle, and lower intervals. Wilcox production has totaled about one billion<br />
barrels of oil since the initial Wilcox discovery in the early 1940's. The Wilcox is<br />
considered a thick sequence of complexly interbedded, continental to deltaic deposits that<br />
consist of seven principal component facies of a delta system, including the (1) bar-finger<br />
sand facies, (2) interdistributary bay mud-silt facies, (3) distributary channel sand facies,<br />
(4) prodelta mud facies, (5) distributary mouth bar-delta front sand facies, (6)<br />
interdistributary deltaic plain sand-mud-lignite facies, and (7) destructional phase sand-<br />
mud-lignite facies (Galloway, 1968). Tye et al. (1991) divided the Wilcox into five<br />
lithostratigraphic units on the basis of sedimentary processes and resistivity-log character,<br />
and mapped unit thicknesses and sand content in 22 parishes. Tye et al. (1991) showed<br />
the units varied from 115 to 1,000 ft in thickness and the sand content ranged from 25 to<br />
60%.<br />
Tertiary Eocene, Oligocene, post-Oligocene (Claiborne, Jackson, Vicksburg)<br />
Tertiary Strata<br />
The Eocene Claiborne Group overlies the Wilcox Group and outcrops in many parts<br />
of north-central Louisiana and in southern Arkansas. In ascending order the group<br />
consists of the following units: 1) Cane River, consisting mainly of glauconitic very<br />
fossiliferous clay; 2) Sparta, a predominantly sandy sequence with interbedded clay<br />
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