CO(2)-storage assessment and effective capacity in Algeria

Deep saline aquifers widely distributed deep in the earth offer the greatest CO(2) storage potential in all current geological CO(2) storage approaches. The western region of the Saharan platform in Algeria includes several sedimentary basins characterized by a large production of dry gas with high CO(2) rates sometimes exceeding 9 %. To reduce CO(2) emissions, these basins were analyzed to identify those with the largest potential for the geological sequestration of CO(2) (GSC). The evaluation methodology applied to determine the basin potential is based on qualitative geological and practical criteria to which we have assigned normalized numerical values. This evaluation method allows us to quantitatively compare and evaluate the basins in Algeria. Estimations of the CO(2) storage capacities of several structures in the sedimentary Ahnet–Gourara Basin, which has the greatest potential for GSC, vary from 1 Gt to over 5 Gt. Based on cautious estimations, these geologic structures should be able to contain the entire volume of the CO(2) emitted over the next three decades at least.