一种新的曲流河点坝砂体侧积层建模方法——以孤东油田七区西Ng52+3层系为例

摘要

曲流河点坝砂体侧积层是控制剩余油分布的重要因素,建立侧积层构型模型有助于深化对特高含水期剩余油分布认识.为此,分析了等效加密正交网格模型与侧积层约束下的倾斜网格模型的优缺点后,确定了点坝砂体侧积层建模的技术关键,针对性地提出了构造界面约束下的点坝砂体侧积层构型网格模型构建方法,在孤东油田七区西Ng52+3层系构型解剖成果和井网形式的基础上,提出了非均质构型属性模型构建方法,建立了Ng52+3层系点坝砂体构型模型.取心井含油饱和度测试资料验证,基于该方法建立的构型模型可以较好地描述侧积层遮挡下的局部富集剩余油,使得剩余油描述精度更高.%The lateral accretion layer in the sandbodies of meandering river point bars is the main factor controlling remaining oil distribution,and the modeling of the lateral accretion layer will be helpful for deepening the understanding of remaining oil distribution in ultrahigh water cut stage.Based on the analysis of the pros and cons of equivalent-privacy orthogonal grid model and inclined grid model constrained by lateral accretion layer,the key modeling technology of lateral accretion layer in the sandbodies of point bars is obtained,and a new method of modeling internal architecture of point bars under the constraint of structural surfaces is put forward.Based on the dissection results and well patterns of Ng52+3 in western District 7 of Gudong oilfield,a modeling method for heterogeneous architectures is presented and a model is established for the sandbodies in point bars in Ng52+3 layer.The oil saturation test data obtained from sealed core analysis verifies that the model can well describe the locally enriched remaining oil sheltered by the lateral accretion layer and the more accurate remaining oil distribution can be gained.