The sedimentary environment of Cardium formation in western Canada basin is the shallow sea coastal face. The conventional oil and gas reservoir is formed from the conglomerate and sandstone deposited on the coastal muddy seafloor. The unconventional tight oil reservoir is formed from the low-permeable argillaceous sandstone around the conglomerate. Faced with the coexistence of different types of resources, the development of SINOPEC oversea blocks with benefit needs to be realized. Firstly, the member A of Cardium formation is divided into three types according to the core observation and experiment test. Then the development features of different types of reservoirs are compared based on the production dynamic data. Thirdly, the geological knowledge is verified via single well theoretical models. Finally, the development potential of different types of reservoirs in the interest block are evaluated. The development strategies of different types of reservoirs are put forward. The results show that the member A of Cardium formation can be classified into type I conglomerate reservoir, type Ⅱ conglomerate reservoir and type III tight sandstone reservoir according to the lithology differences. From type I to type Ⅲ, the reservoir physical properties gradually weaken. The development way changes from vertical well development to multistage fracturing horizontal well development. The productivity controlling factors gradually complicates. Currently, type I and II reservoir in the interest block have a limited potential, which can be further released through reperforations on some old wells. Type III reservoir has a certain potential, which can be effectively released through deployment of large numbers of horizontal wells.