SPE International Symposium on Oilfield Chemistry · 1989 · 12 citations · 18 references
EngineeringOrganic DepositsEarth ScienceReservoir EngineeringOrganic GeochemistryEnvironmental ChemistryElectron MicroscopyCo2 FloodingCo2 Miscible FloodingCarbon SequestrationCo2 Immiscible FloodingOrganic-rich Sedimentary RockRock PropertiesClay MineralOrganic DepositionEnvironmental MineralogyGeochemistryReservoir GeologyPetroleum Geochemistry
ABSTRACT Interactions between CO2 induced organic deposits and mineral matrices were examined. The influence of mineralogy on extent as well as site of deposition, and the effects of organic deposition on mineral properties were determined. In addition, CO2-induced precipitate composition was related to parent-oil composition and geochemical history. Cores exposed to oil/CO2 flooding were contrasted with cores flooded with oil or CO2 alone. The effects of two different oils were compared as well as the influence of two different minerals, Berea and a carbonate. All cores contained residual brine. Changes due to the stabilization of clays were also explored. Core samples were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), pyrolysis, and thin-section microscopy. The nature of organic deposition depended on complex interactions between oil, mineral, and CO2. Organic residue compositions were influenced by parent oil compositions as well as exposure to CO2 flooding. Site of deposition was controlled by mineralogy.
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