Characteristics of Proe Growing in Ordovician Carbonate Reservoirs of Lunnan Buried Hill

Matrix porosity and permeability are low in the Ordovician carbonate reservoirs of Lunnan buried hill,but the reservoir conditions are improved by the growing of dissolved pores.Based on core observation and cast slice analysis,the distributional rules of the carbonate reservoir pores,the pore packing characters and control factors of pore growth in Lunnan buried hill are described,and the effect of pores on the reservoir is analyzed.It is considered that better reservoir space is provided for Lunnan buried hill reservoirs by the pore growth,it not only creats vuggy reservoirs and cavernous reservoirs,and also the grown pores are connected with fractures,thus important fracture-vuggy reservoirs are formed in the area.