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Mancini, E.A., Blasingame, T.A., Archer, R., Panetta, B.J., Llinas, J.C., Haynes, C.D., and Benson, D.J., 2004, Improving recovery from mature oil fields producing from carbonate reservoirs: Upper Jurassic Smackover Formation, Womack Hill field (eastern Gulf Coast, U.S.A.), Am. Assoc. of Pet. Geologists Bull, v. 88, pg. 1629-1651.
Abstract
Reservoir characterization, modeling,and simulation were under-taken to improve production from Womack Hill field (eastern Gulf Coast,United States). This field produces oil from Upper Jurassic Smackover carbonate shoal reservoirs. These reservoirs occur in vertically stacked, heterogeneous depositional and porosity cycles. The cycles consist of lime mudstone and wackestone at the base and ooidgrainstone at the top. Porosity has been enhanced through dissolution and dolomitization. Porosity is chiefly interparticle, solution-enlarged interparticle, grain moldic,intercrystalline dolomite, and vuggy pores. Dolostone pore systems and flow units have the highest reservoir potential. Petroleum-trapping mechanisms include a fault trap (footwall uplift with closure to the south against a major west-southeastötrending normal fault)in the western area, a foot-wall uplift trap associated with a possible southwest-northeastötrending normal fault in the south-central area, and a salt-cored anticline with four-way dip closure in the eastern area. Potential barriers to flow are present as a result of petrophysical differences among and within the cycles, as well as the presence of normal faulting. Reservoir performance analysis and simulation indicate that the unitized western area has less than 1MMSTB of oil remaining to be recovered, and that the eastern area has 2ö3 MMSTB of oil to be recovered. A field-scale reservoir management strategy that includes the drilling of infill wells in the eastern area of the field and perforating existing wells in stratigraphically higher porosity zones in the unitized western area is recommended for sustaining production from the Womack Hill field.
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