划分砂体内部建筑结构的建模方法

The Method of Interior Architectural Structure Analysis for Fluvial Channel Sandstone

统计表明 ,在现有的经济技术条件下的石油采收率平均为 35 % ,有 2 0 %～ 35 %的可动剩余油由于储层非均质性被隔挡在地下 ,它们或者受砂体复杂的建筑结构控制分布于砂体的某一部位 ,或者分布于开发井距难以控制的小砂体中 ,在目前开发井网已经很密的情况下 ,砂体的建筑结构是采收率的主要影响因素。所以 ,解剖砂体 ,认识砂体内部建筑结构要素的类型及分布方式是建立储层地质模型、预测剩余油分布的有效途径。通过对国内外相关论文研究 ,找出适合大庆油田密井网条件下 ,划分厚油层内部建筑结构建立储层地质模型思路和可操作划分方法。

The study shows that the average recovery is 35% in nowadays economy technique conditions, 25% 35% remaining oil is preserved in the reservoir sandbodies for the reason of heterogeneity. Effected by architecture structure, the remaining oil is mainly distributed in some place of sandbodies or isolate sandstone lens which isn't controlled by well pattern. The architecture elements of a sandbody is the first factor that effects the distribution of remaining oil in reservoir, in the condition of dense well pattern of Daqing oilfield,anatomizing reservoir sandbodies using Miall's structural element analysis is new potential approach to build the predictable reservoir geological model and predict distribution of remaining oil. This paper presents a method of interior architectural element analysis for fluvial channel sandstone.