Abstract: In order to improve the architecture classification scheme of clastic reservoir and better apply it to oilfield development,based on the study of reservoir architecture of different sedimentary types in Dagang Oilfield,by establishing three-dimensional geological model and numerical simulation based on reservoir architecture research, the residual oil distribution controlled by architecture was recognized,and the accuracy of reservoir architecture research was required. The classification scheme of reservoir architecture was redefined by combining and corresponding stratigraphic classification with sedimentary microfacies classification. On this basis,the ideas,contents and methods of reservoir architecture research system were put forward. The results show that this reservoir architecture classification scheme is much more explicit,the sixth-order architecture interface corresponds to the composite sedimentary formation unit. On the plane,it corresponds to composite meandering zone or composite braided flow zone,which is composed of more than two single complexes;on the profile,it is composed of small layers or sand layers,and the interior is composed of multiple single sand layers,and mudstone interlayer is developed between the single sand layers. The scheme was applied to Zao Ⅱ and Zao Ⅲ oil formations in Guan 80 fault block of Dagang Oilfield,and the architecture units 7,8 and 9(composite channel,single sedimentary unit and accretion body)were divided and characterized,which have obvious advantages in the study of the archi-tecture of dense well pattern development oilfield in ultra-high water cut stage.

Key words: reservoir architecture, classification scheme, microfacies complex, single microfacies, single sand body, architecture anatomy