classification of enhanced oil recovery methods by lithology

rich zagros basin of hydrocarbon bearing structures in the middle east has led to a number of oil and gas reservoirs in iran are shared with neighboring countries. the reservoirs are integrated in geology, and in terms of property are communal . border competition between neighboring countries has caused the shared reservoirs be in the top attention . in addition, iran's largest oil and gas reservoirs are located in political boundaries . therefore, a better understanding of the reservoir makes better use of them . in this article classified eor methods base on lithology of the reservoirs and investigated the frequent eor method (gas injection) in the carbonate reservoir that is the most reservoir lithology in iran, gas has low viscosity and due to this property we need some complementary methods like foam flooding to overcome this disadvantage.