孤东油田七区西馆陶组上段储层非均质性及剩余油分布

油藏储层的非均质性是影响剩余油分布的重要因素之一。孤东油田七区西馆陶组上段储层在层内、层间以及平面都存在非均质性。储层平面非均质性主要受沉积相带、砂体展布形态控制;层间非均质性主要受单砂体厚度、砂泥比的影响;而层内非均质性主要与层内夹层、层内韵律性有关。夹层的下部、正韵律层的顶部、层系中物性较差的砂体剩余油相对富集,河道砂体边缘和废弃河道等分布局限的砂体也是剩余油富集区。

Reservoir heterogeneity and distribution of remaining oil in upper Guantao Formation in 7th block west,Gudong oilfield

Reservoir heterogeneity is one of the main factors that impact distribution of remaining oil.Intralayer,interlayer and plane-layer heterogeneities exist in the upper Guantao Formation in the 7 thblock west of Gudong oilfield.Plane-layer heterogeneity is mainly controlled by sedimentary facies zones and distribution of sandbodies.Interlayer heterogeneity is mainly affected by the thickness of single sandbody and sand-shale ratio.Intralayer heterogeneity is mainly associated with intraformational beds and intracyclothems.Remaining oil is relatively rich in sandbodies with relatively poor poroperm characteristics,such as in the lower part of interbeds and on the top of positive cyclothems.In addition,sandbodies with limited distribution on the periphery of channel sands and in abandoned channels are also rich in remaining oil.