STUDY ON THE BRAIDED-RIVER SEDIMENTATION AND RESERVOIR HETEROGENEITY OF DUANLIUBO OILFIELD IN DAGANG AREA

The Zao-0 oil group in the Kong-1 Member of Duanliubo oilfield, Dagang area is braided-river deposit. By observing core and loging data, the characteristics of braided-river deposit in the area were a-nalysed, braided-river sandbar, braided channel, braided-river branch, interchannel, natural levee and flood plain six sedimentary microfacies were divided, and the sedimentary and plane distributive characteristics of each microfacies were studied. As braided-river deposit has lower energy, fine lithology and multiple cyclicity, it shows stronger intrastratal and interstratal heterogeneity. The heterogeneity of reservoirs was mainly controlled by sedimentary microfacies on the plane. As braided-river facies changed rapidly, the plane heterogeneity of reservoirs in the area was stronger.