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Remaining Hydrocarbon Potential in Oligocene Reservoirs of Mature Fields, West Baton Rouge Parish, Louisiana

Donald A. Goddard1, Ronald K. Zimmerman2, and Charles M. Meeks2
1Center for Energy Studies, Louisiana State University, Baton Rouge, Louisiana 70803

West Baton Rouge Parish contains several mature fields that produced from Oligocene reservoirs from the 1940s to the late 1980s. Port Allen and Lobdell fields, located approximately seven miles from Baton Rouge on the west side of the Mississippi River, are examples of such production. At present, all the wells in both fields are plugged and abandoned. Production was mostly oil with associated gas and minor amounts of condensate from the Oligocene Upper and Lower Frio formations.

Gas was not considered an important energy resource between 1950 and the 1980s, and because of low prices, many of the gas reservoirs that were tested in the Frio interval in these fields were immediately shut-in. Most of the associated gas produced with the oil was vented and minor quantities were used for gas lift. The calcareous sandstone reservoirs containing oil and gas are readily evident on the wireline logs and corroborated by test data. From the size of the fields (640 to 2000 acres), the well spacing, thickness of the reservoirs (10-20 ft), and the reported cumulative production, it is estimated that the remaining potential in these fields is approximately 4.0 billion cubic feet of gas (BCFG) and 3.0 million barrels of oil (MMBO). Most of the reserves are located in Port Allen Field. Based on such observations and because of today's relatively high oil and gas prices, reservoirs of such mature fields have become attractive economic targets when state of the art drilling and production technologies are applied.


AAPG Search and Discovery Article #90080©2005 GCAGS 55th Annual Convention, New Orleans, Louisiana