Study on Geological 3D Reservoir Architecture Modeling and Distribution of Remaining Oil of Different Development Stage in Meandering Reservoir

Key words: 
• meandering reservoir

Abstract: Considering the production situations of meandering sand bodies at late high watercut stage under dense pattern condition in Daqing Sazhong development and based on the core analysis, well logging and production performance data, the method of hierarchy analysis combined with model matching was applied in subsurface architecture anatomy. The hierarchy analysis mentioned in this paper include the following: sedimentary unit dividing vertically, sedimentary facies dividing in the unit, single channel dividing, point bar or channel bar identifying in the channel sand and the study of the interlayer in the bar.
According to the results of reservoir modeling and numerical simulation, the different patterns of different development stage controlled by different hierarchy architecture elements were summarized at late high watercut stage under dense pattern condition. the three remaining oil distribution patterns of the meandering river reservoir controlled by different hierarchy architecture elements were summarized at late high watercut stage under dense pattern condition, which are triangleshaped remaining oil between point bars, ribbonshaped remaining oil created by abandon channel and flaplike remaining oil created by reservoir injectionproduction faultiness in point bar. Recovery measures for remaining oil controlled by lateral accretion shale bedding were proposed, which are subdivision and adjustment in interlayer, perfecting injectionproduction relation in single meandering belt and drilling horizontal wells on the top of the point bar. 
The recovery measures for remaining oil controlled by lateral accretion shale bedding were proposed. The results show that the relationship of width/thickness ratio of sand body and lateral accretion interlayer's dip angel is well. The empirical formula could be used to predict dip angel of lateral accretion in meandering reservoir of Daqing placanticline. The efficiency of stochastic modeling is greatly improved with the automatic model matching method. The model can be numerical reservoir simulation. Simulation result show the distribution of interlayer remaining oil. This research finds that the different remaining oil should take different recovery measures. 