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- W2021304428 abstract "Organic acid anions such as acetate (a natural product of the thermal breakdown of kerogen) may buffer the pH of natural formation waters. The extent of pH buffering by acetate should determine whether an increase in the partial pressure of carbon dioxide (pCO2) will lead to calcite dissolution (porosity enhancement) or calcite precipitation (porosity destruction). Successful prediction of porosity therefore requires a quantitative understanding of this process. This paper presents computer simulations of the response of the acetic acid-carbonate system to changes in pCO2 for typical reservoir fluid compositions and temperatures. The effects of variations in temperature, ionic strength, initial Ca2+ concentration, and the magnitude of the change in pCO2 were investigated. Natural formation waters from Cenozoic reservoirs in the Gulf Coast Basin and California show maximum organic acid concentrations at 100 ± 20°C. At 100°C, the simulations show that for concentrations of acetic acid up to ∼0.06 m (3600 mg l−1), increases in the pCO2 of initially calcite saturated solutions will promote calcite undersaturation. At higher temperatures, equivalent buffering responses occur at lower acetic acid concentrations but acetic acid concentrations in natural formation waters also decrease rapidly with increasing temperature. Since present-day concentrations of acetic acid in formation waters from Cenozoic reservoirs rarely exceed 0.06 m, increases in pCO2 will generally promote calcite dissolution by these waters. In the Gulf Coast Basin, variation in organic acid concentrations as a function of reservoir age suggests that reductions in dissolved organic acid concentrations over geologic time have been relatively small. It can be concluded, therefore, that at any point in the histories of these reservoirs, an increase in pCO2 would have promoted calcite dissolution, despite the effects of pH buffering by acetate. Since increases in pCO2 will in most Cenozoic basins promote calcite dissolution, knowledge of the location and timing of CO2 production in the subsurface can more easily be applied to the prediction of calcite cementation and dissolution." @default.
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- W2021304428 date "1989-01-01" @default.
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- W2021304428 title "Carbonate equilibria and pH buffering by organic acids — Response to changes in pCO2" @default.
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- W2021304428 doi "https://doi.org/10.1016/0009-2541(89)90038-7" @default.
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