Flow-through experiments on water–rock interactions in a sandstone caused by CO2 injection at pressures and temperatures mimicking reservoir conditions

作者: Farhana Huq , Stefan B. Haderlein , Olaf A. Cirpka , Marcus Nowak , Philipp Blum

DOI: 10.1016/J.APGEOCHEM.2015.04.006

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摘要: Abstract Flow-through experiments were performed in a newly designed experimental setup to study the water–rock interactions caused by CO 2 injection sandstones obtained from Altmark natural gas reservoir under simulated conditions of 125 °C and 50 bar partial pressure. Two different sets conducted using -saturated millipore water brine (41.62 g L −1 NaCl 31.98 g L CaCl ·2H O), mimicking chemical composition formation water. The major components sandstone quartz (clasts + cement), feldspars, clay minerals (illite chlorite), cements carbonates anhydrite. Fluid analysis suggested predominant dissolution anhydrite causing increased concentrations calcium sulfate at early time periods non-equilibrium geochemical conditions. Ca/SO 4 molar ratio (>1) indicated concurrent both calcite Dissolution feldspar minor amounts (chlorite) was also evident during flow-through experiments. permeability sample factor two mostly due rock injection. Geochemical modeling suggests as buffering process system. results may future studies be used for numerical simulations predicting storage reservoirs.

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