AbstractIn order to better understand the geochemical behavior of carbonate and siliciclastic materials that may host carbon dioxide in the subsurface, we carried out experiments using a dolostone from the Weyburn formation and an arkosic sandstone from the Newark Basin. Synthetic brine (0.7 m NaCl) saturated with CO2 with or without CH4 reacted with the powdered materials for 30 to 60 days at 100 bars pressure and 50 – 150°C. The reactivity of the material was monitored by release of elements from the rock to solution over time. A subset of experiments were carried out in which an acidic heavy metals solution was injected into a Weyburn experiment in order to simulate the release of metals to solution through injection of CO2-saturated brines. The results show that the heavy metals do not stay in solution and rapidly decrease in concentration to pre-injection levels after a few days’ time
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