【摘要】 根据二类油层的界定标准,将大庆油田萨北油层分成高弯曲分流河道砂体沉积、低弯曲分流河道砂体沉积、内前缘枝状三角洲砂体沉积、内前缘过渡三角洲砂体沉积、内前缘坨状三角洲砂体沉积 5 种类型,分析了各类砂体的非均质特征. 结果表明:该储层有效厚度和渗透率均较小,分布零散,层内非均质性严重,形成“死油区”;多相带组合,多旋回沉积,河道切叠,层间非均质性严重,导致“单层突进”;受沉积相带控制,平面非均质性严重,导致“平面舌进”;由此影响剩余油的分布.更多还原

【Abstract】 According to the definition of the better thick oil reservoir ,the area in the north of Saertu of Daqing oil field is classified as high bending distributary channel sandbody, low bending distributary channel sandbody, the transitional sandbody of delta inner front, the mound lump sandbody of delta inner front. The heterogeneities specialty of those sandbodies have been studied. The results show that the reservoirs possess the thin effective thickness, low permeability, scattered distribution and bad inlayer heterogeneity, all of which contribute to the formation of dead oil zones. While poly facies belt group, polycyclic sedimentation, channel uniting and overlaying and interlayer heterogeneity result in the monolayer breakthrough. Under the control of sedimentary facies belt, bad plane heterogeneity leads to plane fingering. All those factors affect the distribution of oil remaining.更多还原