曲流河点坝及其内部构型建模方法

A modeling method for meandering-river point bar and its internal configuration

为提高老油田开发水平,挖掘剩余烃潜力,进一步探索提高采收率新途径,通过三维地质建模技术,对曲流河点坝及其内部构型开展建模技术方法研究。在储层砂体内部侧积层及侧积泥岩精细描述的基础上,应用地震沉积模拟、一般示性点模拟、多点统计模拟方法,利用循环嵌套的技术,建立定量化三维地质模型,输出结果应用于数值模拟。模拟结果表明:①循环嵌套技术可以有效建立9级层序界面的地质模型,且该模型精度满足后期数值模拟精细研究的要求;②模拟结果清晰显示老油田剩余烃主要富集在砂体顶部及侧积泥岩遮挡部分,为提高老油田采收率提供了有利依据。

To improve the development of age-old oilfields by tapping the potential of remaining hydrocarbons and probing new EOR techniques,a modeling method is presented for meandering river point bar and its internal configuration with the support of 3D geological modeling.So,based on the fine description of both lateral accretion layers and lateral accretion mudstone inside reservoir sandbodies,a quantitative three-dimensional geological model was established by using the loop-nesting technique as well as the seismic-sedimentation simulation,general character-point simulation and multi-point statistical simulation.And output data were applied to numerical simulation.Results show that(1)the geological model with 9-order sequence boundary can be effectively constructed by loop nesting,and its accuracy meets the requirements of subsequent numerical simulation;and(2)the remaining hydrocarbons in old oilfields are mainly accumulated at sandboby top and in shielded lateral accretion mudstone,which offers favorable basis for recovery enhancement.