| dc.description.abstract | The grainstone and the thrombolite reservoir units of the Smackover Formation at Little Cedar Creek Field, Brooklyn Field and Feagin Creek Field, Alabama, USA, were analyzed to determine their spatial and temporal relationships. The reservoir quality in the three fields is most closely linked with facies type; however, diagenesis plays a key role in enhancing or reducing porosity. Core descriptions, thin sections, core analyses and wireline logs of the Smackover Formation were used to create lithologic facies logs. Geologic cross-sections were generated from the lithologic facies logs to map changes in facies deposition over and between the three fields. Sequence stratigraphy was applied to the cross-sections to produce a depositional model over time of the study area. Three 5^th-order sequences comprise the study area. The grainstone reservoir of Little Cedar Creek Field was deposited during an earlier sequence than the grainstone reservoir of Brooklyn/Feagin Creek Fields.
Petrography and cathodoluminescence were analyzed to develop a paragenetic sequence of the Smackover Formation in the study area. Late stage diagenetic events are similar for all facies studied, but early diagenesis varies between the grainstone and thrombolite reservoir units. Dolomitization occurs in the southern thrombolite reservoirs, but does not serve to increase porosity, rather it may occlude it entirely. | en |
