Cyclostratigraphy and Reservoir Correlation of the Oilgo-Miocene Sediments (Asmari Formation) in the Marun Oilfield, Zagros Basin

The Asmari Formation in the Marun oilfield is composed of fossiliferous limestone, dolomitic limestone, argillaceous limestone, sandstone and shale. It is the major reservoir rock of Iran in several oil fields of the Zagros Basin. The age of Asmari Formation in this oilfield is Oligo-Miocene (Rupelian–Burdigalian). In this study, subsurface correlation between the four wells in the Marun oilfield, based on climate stratigraphy is done by using Cyclolog Software. Nine Positive and ten negative bounding surfaces have been identified. Some positive and negative bounding surfaces coincide with sequence boundaries and maximum flooding surface, respectively. In addition, some of the positive bounding surfaces identified the main time boundary (stage boundaries). Reservoir correlation between the ten compartments reservoir zones of the Asmari Formation in the Marun oilfield is done with these boundary surfaces. Some reservoir zones (especially the lower and middle Asmari reservoir zones) show perfect matching but others do not show the boundary of adaptive zones. It seems combining these data with other factors such as lithology, porosity and permeability, detail revision of reservoir zoning of Asmari Formation in Marun Oilfield is required.