Dolomitization associated with faults in the subsurface is one of the most important porosity and permeability modifiers, and can pose some serious problems during production of carbonate reservoirs or during drilling operations. Hence, understanding the processes leading to dolomite bodies along fault and the spacial distribution of these dolomite bodies is of direct relevance to the oil and gas industry.
Our project is centered on the study of deep-sited dolomitization along faults, in the Jebel Akhdar area of the Oman Mountains. In this region excellent outcrops of late-diagenetic dolomite, hosted in Precambrian, Permo-Triassic and Jurassic limestones provide a unique opportunity to study this process and establish whether or not it represents an analogue for similar processes in the subsurface. The origin of the dolomite will be investigated using both geochemistry and geometric relationships, and the structural setting of the fault-related dolomite bodies will be investigated through a fracture analysis.