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NATURAL ANALOQUES FOR CO2 STORAGE IN ROMANIA
Abstract
In general, analogues are examples that demonstrate one or more key aspects of some concept or technology that is being developed. By studying such analogues, we can improve our understanding of both the technical concept and its application - in this case, large-scale geological CO2 storage involving one or more Mt of CO2. Two main types of CO2 occurrence are found in nature: ?Accumulations that have remained in place for thousands to millions of years with noevidence of leakage (Ciocaia site); and ?Accumulations that have leaked over time. In Romania, Natural accumulations of CO2 with no evidence of leakage, exist inCiocaia site where natural CO2-rich gas reservoirs exist. While there are many examplesworldwide of CO2-rich gas being stored successfully in natural reservoirs for millions ofyears, there are also examples of sites (Ocolis site ? pure CO2- 95%) where significantvolumes of CO2 have leaked in the past, or continue to leak, from deep underground. Comparison of the geological features of both types helps to identify those features thatare likely to lead to leakage and, therefore, to be avoided.
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