I. Wazir, M. Pagel, F. Tournier, E. Portier and C. Renac Role of compressive tectonics on gas charging into the Ordovician sandstone reservoirs in the Sbaa Basin, Algeria: constrained by fluid inclusions and mineralogical data Geofluids 14
Hercynian compressive tectonic controls the early gas migration from Silurian shale into Ordovician sandstones. Gas trapped in primary inclusions has the same composition as the present-day gas in the reservoir. Gas-bearing fluids control dickite formation in the reservoir, which limits its occurrence close to the Silurian shale and in the fractured sandstones. Occurrence of late carbonate cements and veins at the same depths resulted from the same groundwater precipitation. The absence of methane inclusions in calcite cements results from its flushing by saline waters.
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