Abstract: South China has experienced intense reconstruction from multiple structural movements and caused complex Mesozoic-Palaeozoic hydrocarbon evolvement, resulting in the formation of oil and gas reservoirs with diversified origin and complex regular pattern. Based on genetic analysis, the reservoirs could be divided into primary reservoirs, secondary reservoirs, and regenerated reservoirs. There are pore reservoir (oolitic beach and organic reef), fractured reservoir, fracture- pore reservoir and pore-fracture reservoir. All reservoir types were mainly controlled by special sedimentary-diagenetic facies and structures. Effective preserving conditions and good match of key elements for reservoir formation in time and space were very important to the reservoir formation of Mesozoic-Palaeozoic marine facies carbonate rock. This paper pointed out the future exploration orientation, i.e. looking for the secondary porosity reservoir leached by fresh water or the dolomization reservoir created by the mixture of sea water and fresh water and microfracture reservoir, looking for the area with the combination of thick source bed, reservoir strata and capping.

Key words: Mesozoic-Palaeozoic, carbonate rock, reservoir formation, diversification, South China