Fracture-related dolomite bodies are common in subsurface carbonate reservoirs of the world. Such diagenetic bodies are the result of a mineralogical transformation in the rock due to chemical reactivity of diagenetic fluids. Some fluids are not only capable of replacing calcite into dolomite, but can also generate dolomite cement. While calcite replacement by dolomite results in a porosity decrease, dolomite cementation will cause pores to be filled.
The goal of this research project is to use extensive dolomite bodies present in the Permian lithologies of Oman as analogues for the subsurface Qatar where similar type of dolomite bodies could be expected. The main research questions to be addressed at the outcrops is what is the respective role of the sedimentologic facies and fractured on controlling later dolomitization processes. This problem is tackled by measuring the dimensions of dolomite bodies at the outcrop, mapping the distribution of depositional and diagenetic facies, and by subsequent lab analysis.