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重点通过对马岭—镇北地区长8油藏储层的研究,将研究区长8油藏的储层砂体类型划分为2大类4小类:水道砂体(水下分流河道、水下深切水道、扇内水道)、河口坝砂体。在其它成藏条件的有机配置下,形成了以上述4种类型砂体为储层的多层叠置的连续型油藏。其特征为:①油藏分布在湖盆斜坡和中心位置的砂体连片叠置的沉积体系中;②4类储层单砂体在空间上呈随机性的多层叠置,其存在板状和交错两种叠置方式,且各自具有不同的方向和产状;③多套旋回的单砂体在空间上形成叠置连片的油层组合,但各自具有独立的油水界面系统,油、气、水、干层易共存。在此基础上,建立了研究区长8“多层叠置的连续型油藏”成藏模式。
Based on the study of Chang 8 reservoir in Maling-Zhenbei area, the paper mainly divides the reservoir sand bodies of Chang 8 reservoir into two categories and four subcategories: water channel sand body (underwater distributary channel, water Under the deep waterway, fan waterway), mouth bar sand body. Under the organic configuration of other reservoir forming conditions, a multi-layered continuous-type reservoir with the above-mentioned four types of sand bodies as reservoirs is formed. Which is characterized in that: (1) the reservoirs are distributed in the sedimentary system of contiguous sand bodies superimposed on the slope and central part of the lake basin; (2) the sand bodies of Class 4 reservoirs are spatially randomized and stacked in layers, Staggered two kinds of stacking modes, and each has different directions and occurrences; (3) multiple sets of single-cycle cyclotron spatially forming superimposed contiguous reservoirs, but each has an independent oil-water interface system, oil, gas, Water, dry layer easy to coexist. On the basis of this, a study was established to study the accumulation pattern of 8 “multi-layered continuous-type reservoirs.”