三角洲沉积砂体骨架模型及储层属性地质模型的实现——以渤海某油田为例

以往三角洲沉积储层地质模型的实现过程多是强调某一种建模方法的使用。文中以渤海某油田为例,综合应用地震及井点信息,探讨了将确定性地质建模与随机地质建模两种方法、相模型与属性模型两种模型相结合建立三角洲沉积砂体骨架模型及储层属性地质模型的方法。使用确定性建模手段可以刻画出那些基于地震反演资料识别、把握程度相对较高、规模相对较大的砂体;应用序贯指示随机模拟方法可以表征规模小、具随机分布特征的砂体;以砂体单元为对象、井参数为约束、地震反演属性体为趋势,应用随机模拟方法实现的储层属性地质模型,能够更客观地反映砂体内部的非均质程度。合理使用各种储层地质建模技术,可以获得更接近实际的地质模型,从而为油田开发方案编制、调整,开发效果预测,以及油田开发潜力与风险评价提供依据。

A realization of deltaic sandbody framework model and reservoir attribute model:a case study on an oilfield in Bohai Bay

During previous geological modellings of deltaic reservoir,more emphases are generally focused on the application of one given modelling method.In this paper,however,an oilfield in Bohai bay is taken as an example,where a method to build framework model and reservoir attribute model of deltaic sandbodies is discussed,by combining deterministic geological modelling technique with stochastic one and combining facies model with attribute one.The well-contralled sandbodies with large size and identified by seismic inversion data can be depicted by the deterministic modelling method,and the Sequential Indicator Simulation(SIS) technique can be used to characterize smaller sandbodies with stochastic distribution.Targeting at individual sandbody,constrained by wellbore data and taking seismic inversion attribute volume as a trend,the realization of reservoir attribute model by using stochastic modelling can more objectively represent heterogeneity within sandbodies.If various techniques of geological reservoir modelling can be applied reasonably,a geological model with more reality will be built,providing(a foundation) for designing and adjusting development plans,predicting development effects and evaluating development potential and risk in the oilfields.