A view of dual and triple pore-medium of pore-group is proposed in this paper.According to macroscopic observation and data analysis of capillary pressure test in core samples

it has been proved that a few non-fractured pore-networks coexist with each other in the conglomerate reservoir of the Lower Wuerhe Formation

the 8th district of Karamay oilfield.In well testing

the re-servoir of this kind shows the feature of dual or triple pore-medium curves.In order to feature precisely the property of such reservoir with multiplesets of pore-network

a new conception of pore-group is termed by the au-thors

thus the geometric property of pores is closely connected with its geo-logical origin.What's more

this new conception reveals profoundly the natureof seepage flow in the reservoirs—the basic framework of seepage flow in reser-voir is formed by the combination and interaction of pore-groups.