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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The Tuscaloosa Rejuvenated: Beaver Dam Creek and Baywood Fields St. Helena Parish, Louisiana
By
Recent discoveries in the Tuscaloosa formation (Lower-Upper Cretaceous) of Southeast Louisiana have opened a new trend, which has the potential of yielding large reserves of oil and gas. Beaver Dam field, located in St. Helena Parish and discovered in early 1987, is presently being developed, and has a potential reserve of 50 BCF gas and 5,000,000 barrels of condensate.
Beaver Dam Creek and Baywood fields are located along a paleoshoreline of Tuscaloosa age, which strikes northwest-southeast across the Florida Parishes of Louisiana. The old shoreline extends approximately 50 miles from central West Feliciana Parish to Lake Ponchartrain in Tangipahoa Parish. This trend is parallel to and immediately north of the Tuscaloosa shelf edge. North of this paleoshoreline lies a fluvial environment of Tuscaloosa age characterized by channel fills and point bars, many of which form hydrocarbon traps such as the Greensburg and Lake Rosemond Fields.
Both the Baywood and Beaver Dam Creek fields produce from the Tuscaloosa "A" member. The sand, at a depth of 14,500', does not require protective pipe to reach. The trapping mechanism for Baywood and Beaver Dam Creek appears to be structural-stratigraphic. Seismic
data
, geological mapping and cross sections suggest that many other potential traps, located along this interdeltaic shore
zone depositional system, have hydrocarbon potential similar to the Beaver Dam Creek and Baywood fields. Using Beaver Dam Creek and Baywood as an analog, it is almost certain that additional fields can be uncovered along the 50 mile paleoshoreline.
Subsurface and seismic
data
are the basic exploration techniques used to locate features along the trend. Synthetic seismograms, models and
seismic
inversion or "seislogs" are employed to augment the
seismic
stratigraphic
interpretation
. First, a network of synthetic seismograms are developed to identify the
seismic
signature of the Tuscaloosa "A" sand so it can be located on
seismic
sections. Models are used to define shoreline features and clearly identify prospective areas of good sand development and porosity. Sand pinchouts on
seismic
lines are clearly evident from an abrupt change in
seismic
character. In addition, prospective areas are usually associated with pronounced flattening and in some cases subtle arching along the Tuscaloosa paleoshoreline.
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