Information Circular 107 North Florida Oil Field Summaries INTRODUCTION Production in north Florida began with the discovery of Jay field in June, 1970. There are now eight panhandle oil fields located in Escambia and Santa Rosa Counties, Florida (Figure 3). Seven fields are active and one is plugged and abandoned. Production is from Upper Jurassic Smackover Formation carbonates and Norphlet Sandstone sands (Figure 4). Jay field is located within a trend which extends through Escambia and Santa Rosa Counties in Florida, and Escambia County, Alabama. Other fields within the trend include Mt. Carmel, Coldwater Creek, and Blackjack Creek fields in Florida and Fanny Church, Flomaton, and Big Escambia Creek fields in Alabama. The fields are located along a normal fault complex which rims the Gulf Coast through Alabama, Mississippi, Louisiana, Arkansas, and Texas (Moore, 1984). Bluff Springs and McDavid fields are located west and southwest of the Jay trend in an area known to be underlain by Louann Salt, with seismic studies indicating salt-induced fault structures in the overlying formations (Lloyd and Applegate, 1987). The remaining two north Florida oil fields, McLellan and Sweetwater Creek, are located east of the Jay trend, near the approximate updip limits of the Smackover Formation (Lloyd, 1989; Applegate et al., 1978; Ottman et al., 1973 and 1976) and could be the result of stratigraphic pinchouts. They are also located within the area known to be underlain by the Louann Salt and may have salt-related trap structures. Current data does not reveal which trapping mechanism produced the Smackover reservoirs for these fields. BLUFF SPRINGS FIELD Bluff Springs field was discovered on March 25, 1984. The discovery well, the Stone Petroleum Corp. St Regis Paper Co. number 29- 4 (permit 1125), was a rank wildcat located in Section 29, Township 5 North, Range 31 West, Escambia County (Appendix 1). It is approximately 10 miles west-southwest of Jay field and approximately four miles southeast of the nearest previously drilled wildcat, permit 1177 (Figures 3 and 11). This area, west and southwest of Jay, is known to be underlain by Louann Salt, with seismic studies indicating salt- induced fault structures in the overlying formations (Lloyd and Applegate, 1987). Seismic data has been interpreted by Hughes Eastern Corporation (1988) (Figure 11) to indicate several small structures in a northwest-to- southeast trend in this specific area. The discovery well produced 477 barrels of oil and 170 barrels of saltwater per day. Oil gravity was 57.0 A.P.I.. Production is from Jurassic- age Smackover Formation dolostones from -16,154 to -16,161 feet MSL. These dolostones are dark brownish-gray to brownish-black, fine grained, microcrystalline, and show evidence of recrystallization from originally oolitic and possibly pelletal facies (Lloyd, 1986; Lloyd and Applegate, 1987). The first offset, permit 1136 (Stone Petroleum Corporation St. Regis Paper Company number 29-3) is located about one-half mile northwest of the discovery well (Figure 11). The Smackover Formation was encountered at -16,171 feet MSL, structurally 17 feet lower than in the discovery well (Figure 12). The well produced only saltwater from two thin zones (-16,182 to -16,185 feet MSL and -16,192 to -16,195 feet MSL; Figure 12) within the upper Smackover. Core analysis by Location Sample Service, Inc. (LSS), Jackson, Mississippi, yielded mean porosity estimates for these zones of 11.4 and 8.4 percent, respectively. LSS found a trace of oil in one sample at -16,185 feet MSL. This well may be located too low on the structure. Alternatively, as shown on the structure map (Figure 11) drawn by Hughes Eastern Corporation (1988; based on geophysical and well data), Hughes believes there may be a permeability barrier between the discovery well and this well.