轮南潜山奥陶系碳酸盐岩储层孔洞发育特征

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

轮南奥陶系潜山碳酸盐岩储层基质孔隙度和渗透率很低,但溶蚀孔洞的发育改善了其储集条件。根据岩心观察和铸体薄片分析,论述了轮南潜山碳酸盐岩储层孔洞分布发育规律、孔洞充填特征及孔洞发育的控制因素,并分析了孔洞对储层的影响。认为孔洞的发育为轮南潜山油藏的提供了良好的储集空间,不仅形成孔洞型储层和洞穴型储层,而且发育的孔洞与裂缝相通,形成该地区重要的裂缝孔洞型储层。

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.