SEDIMENTOLOGIC AND PETROLOGIC CHARACTERIZATION OF A MAJOR GEOLOGIC CARBON SINK: THE PALUXY FORMATION, CITRONELLE DOME, GULF OF MEXICO BASIN, ALABAMA
Petrographic analysis of indicates that the sandstone units are composed of arkose to quartzarenite. Porosity and permeability are well-developed in the sandstone, with values commonly exceeding 20% and 200 mD, respectively; permeability locally exceeds 3800 mD. Intergranular pores predominate, and intragranular pores are common in feldspar. Secondary porosity is attributed mainly to dissolution of feldspar. Quartz is the most abundant authigenic cement and is expressed primarily as overgrowths; pore-filling calcite and ferroan dolomite also are common. Authigenic clay includes grain-coating illite and pore-filling kaolinite. Provenance analysis indicates that most of the detritus originated in transitional continental to craton interior settings. Most diagenesis occurred during pedogenesis, and ferroan dolomite preciptated during later burial. Many Cretaceous sandstone units in the eastern Gulf Coast resemble the Paluxy Formation at Citronelle, indicating exceptional storage capacity exists in the Cretaceous redbeds of the region.