Fluid flow and late diagenesis of fault-infill carbonates in the Aptian dolostones at Jabel Semmama, Kasserine area, western-central Tunisia

摘要

In Western-Central Tunisia, Kasserine area, dolomitization of Jabel Semmama Aptian limestones of the Serj Formation (Fm) led to the dolostones of the Orbata Fm. These dolostones are cross-cut by several generations of faulting and fracturing. The current study focused on E-W trending faults and fractures system incorporating carbonate infills and freshwater flows which have stimulated continental diagenetic processes. The faulting, fracturing and rock-fluid interactions yielded nine fault-inn diagenetic and tectonic-sedimentary phases. The purpose of studying the tectonic stresses and the nine phases was to elucidate their late impact on the Aptian dolostone reservoir quality. This enquiry was based on lithological, tectonic, microfacies and oxygen/carbon (O/C) isotopes investigations.