Carbonate reservoirs in the Middle East are mainly located in the Cenozoic and the Mesozoic formation. On the one hand, the lithologies of porosity carbonate reservoirs are very complex, including dolomite, wackestone, packstone, grainstone and a small amount of sandstone. On the other hand, there are various types of pores in the porosity carbonate reservoirs, such as dissolution pores, biological pores, intercrystal pores, moldic pores, microfractures and so on. Consequently, it is difficult to accurately calculate the reservoir parameters and evaluate oil and gas reserves.

Based on the evaluation of pore structure, taking into consideration the impact of sedimentary environment and the diagenesis, the dolomite reservoirs are divided into three types and the limestone reservoirs are divided into six types. Only when the pore structures are accurately characterized and reservoir types are properly classified, can the reservoir parameters of dolomite and limestone reservoirs be accurately calculated. Based on the evaluation of pore structure, the classification and evaluation method of carbonate reservoirs is built up in the research into M oilfield. It lays a theoretical and practical foundation for the accurate evaluation of complex carbonate reservoirs in the Middle East.


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