大北油田萨尔图油层特低渗储层宏观非均质性研究

大北油田萨尔图油层属于特低渗透储层。从沉积微相的角度对萨尔图油层宏观非均质性研究表明，储层非均质性较强，而其非均质性主要受控于沉积环境、成岩作用及裂缝发育情况等因素。萨尔图油层在本区发育水下分流河道、席状砂、远砂坝和浊积扇(滑塌沉积)等4种储层微相，油层非均质性在各种沉积微相之间的过渡部位及浊积扇微相中较强；其次为席状砂微相和远砂坝微相，在水下分流河道中相对较弱。

Study on macro heterogeneity of extra-low permeable reservoir beds--an example from Saertu oil-bearing layer in Dabei Oilfield

Saertu oil-bearing layer in Dabei Oilfield is an extra-low permeable reservoir bed. The analysis of macro heterogeneity of Saertu reservoir bed is on the basis of research on sedimentary microfacies. It indicates that the reservoir bed is high heterogeneous. The strong heterogeneity is controlled by sedimentary,environment, diagenesis and fracture development. Four types of reservoir bed sedimentary microfacies are identified in the Saertu oil-bearing layer,i.e. subaqueous distributary channel,mat-shape sand,distal bar and turbidity fan (slump deposit). It is concluded that the heterogeneity in turbidity fans and the transition areas between two different microfacies are the strongest,and it decreases subsequently in mat-shape sand and distal bar and in subaqueous distributary channel.