基于改进布尔模拟的曲流河点坝建模

曲流河点坝是一类非常重要的储集层,其中的泥岩侧积层是控制剩余油分布的一个重要因素,定量表征曲流河点坝内部侧积层的分布对于剩余油的挖潜有着重要意义,目前的建模方法尚难以较好地对其进行模拟。通过对曲流河点坝砂体的细致研究及各种模拟方法的比较,决定采用布尔模拟方法使其模拟效果更好。布尔模拟方法是一种简单的基于目标的随机建模方法。在布尔模拟方法的基础上对其进行了改进,通过改变模拟砂体宽厚比、中心点位置等,使模拟砂体更符合真实的地质体形态,更能够模拟曲流河侧向迁移的过程,进而模拟泥岩侧积层的分布。文中提出的算法从点坝砂体内部泥岩侧积层形成机理出发,较好地模拟了泥岩侧积层的分布。

Modeling of meandering river point bar based on improved Boolean simulation method

The meandering river point bar is a very important reservoir,in which the mudstone lateral accretion interlayer is an important factor to control the distribution of remaining oil.The charcaterization of lateral accretion interlayer distribution within meadering river point bar has the vital significance for the tapping potentials of remaining oil,but the current modeling method is difficult to simulate the mudstone lateral accretion interlayer.Through researching the sand body of meandering river point bar in detail and comparing with the various simulation methods,this paper adopts the Boolean simulation method to make the meandering river point bar get the best simulation results.Boolean simulation method is a simple stochastic modeling technology that is based on the object.On the basis of Boolean simulation method,it is modified by changing the width-thickness ratio of sand body and the epicenter location,which can make the simulated sand body be in line with the shape of real geological body and simulate the lateral migration course of meandering river,then simulate the distribution of mudstone lateral accretion interlayer.From the formation mechanism of mudstone lateral accretion interlayer within the sand body of meadering river point bar,the proposed algorithm has simulated the distribution of mudstone lateral accretion interlayer.