3-D modeling of carbonate reservoirs using geostatistics: A case study for porosity estimation in A Oil field in Zagros basin (Iran)

Various methods are used for reservoir 3-D modeling, among them geostatistic method is applied for 3-D modeling of Asmari Fm. reservoir in one of the Oil field in SW Iran. PETREL® software was used for construction of structural and Petrophysic models. Data of 73 wells were imported into the PETREL® software in digital format. In order to reveal probable impact of structural factors on porosity enhancement, data of all mapped faults were also inserted to the model. UGC map prepared with Map Card software were used on a base map for simulation. Modeling simulation of the reservoir via data provided with those boreholes with relatively more complete petrophysic data, give reasonable results. Accordingly considerable porous intervals are recognized in upper and middle Asmari (Zones 1, 2, 3 and 6) and somewhat lower Asmari (subzone 7/2 and partially zone 8) Hence it is evident that zones 2, 6, subzone 7/2, 8 and 1 are qualified as good to very good pay zone and rest of the Asmari Fm fall within moderate to poor productive zones.