Abstract: Good industrial oil flows of daily oil production 260 m3 has been acquired from 180x2 wells in carbonate rocks of Nanpu depression,Huanghua depression and surrounding the Cambrian system,which reveals the Cambrian carbonate is of good oil and gas exploration prospect.However,because of low degree of prospecting and less drilling data,the research on carbonate rock reservoir has not deep yet,and it has become a bottleneck problem of the oil and gas exploration breakthrough.Through comprehensive studies,the results show Cambrian carbonate rocks are polycyclic tectonic movement of karst,multiphase and diagenesis control seam hole composite reservoir,solution pores,cracks and porosity,pore type and fracture type,a total of four types of reservoir space have been well developed.Solution pores,fractures and pore type reservoir are of better properties,which are mainly distributed in seepage in karst belt and undercurrent karst belt of the lower-middle Cambrian,which provides important horizon for the next deployment of oil and gas exploration.