大港段六拨油田网状河沉积及储层非均质性研究

大港段六拨油田孔一段枣0油组为网状河沉积。通过岩心和测井数据观察,分析了本区网状河沉积的特征,划分出网状河砂坝、网状河道、网状河叉道、河道间、天然堤和泛滥平原6种沉积微相,并分析了每种微相的沉积和平面展布特征。由于网状河沉积能量较小,岩性细,具有多旋回性,表现为较强的层内、层间非均质性。平面上储层非均质性主要受控于沉积微相。由于网状河相变快,所以本区储层平面非均质性较强。 

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.