Seismic-driven geocellular modeling of fluvial meander-belt reservoirs using a rule-based method
Seismic-driven geocellular modeling of fluvial meander-belt reservoirs using a rule-based method
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DOI：
10.1016/j.marpetgeo.2018.03.042
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发表时间：
2018-05
影响因子：
4.2
通讯作者：
L. Colombera;N. Yan;T. McCormick-Cox;N. Mountney
中科院分区：
文献类型：
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作者：
L. Colombera;N. Yan;T. McCormick-Cox;N. Mountney
提出了一种新颖的工作流程，用于构建由大型点坝建筑元素组成的河流储层静态模型，基于专门的正演地层模型的应用，称为“点坝沉积建筑数值推演”（PB-SAND）。该方法使用来自3D地震数据集的解释水平切片来重建曲流环的平面演化，在此基础上可以确定性地模拟点坝沉积物和相关增生单元的几何形状。然后，通过基于规则的算法，生成反映地质理解的相结构，将所得的曲流带几何形状填充为不同类型的相，使用户能够在曲流演化样式（例如，通过扩展、平移、旋转而增长的曲流）和相分布之间建立联系。输入参数定义了从地下数据和/或地质模拟中捕获的点坝矿床类型的比例、几何形状和分布。可以生成相结构的多个随机实现。为了演示这种建模方法的应用，该工作流程已应用于曲流带储层，其中大型点坝和河道充填元素在地震中成像。一个详细的示例用于说明可用于在预钻环境中构建高分辨率扇区模型的工作流程，适合指导开发计划。另一个例子展示了如何通过将新算法与传统地质统计技术相结合的混合方法来实现密集钻探扇区的井匹配。它展示了工作流程如何考虑从地震数据推断的点坝生长方式、非均质性的分布和几何形状，以及这如何促进对点坝储层静态连通性具有重要控制作用的地质特征的再现（例如坝前泥幔的分布和特征，以及坝前泥幔的分布和特征）。由于渐进的曲流弯曲收紧或曲流弯曲顶点之外的下游沉积物细化而产生的容易泥浆的包）。与传统的基于变差函数的方法进行比较，以比较描述点坝内静态连通性的指标以及代表泥幔对坝上砂体划分程度的代理指标。
A novel workflow is presented for building static models of fluvial reservoirs composed of large point-bar architectural elements, based on the application of a specialized forward stratigraphic model, named ‘Point-Bar Sedimentary Architecture Numerical Deduction’ (PB-SAND).The approach uses interpreted horizontal slices from 3D seismic datasets to reconstruct the planform evolution of meander loops, on which basis the geometry of point-bar deposits and associated accretion units can be simulated deterministically. The resulting meander-belt geometry is then populated with different types of facies, through a rule-based algorithm that generates facies architectures that reflect geologic understanding, enabling users to establish linkages between styles of meander evolution (e.g., meander growth via expansion, translation, rotation) and facies distributions. Input parameters define the proportions, geometries and distributions of types of point-bar deposits, as captured from subsurface data and/or from geologic analogs. Multiple stochastic realizations of facies architecture can be generated.To demonstrate the application of this modeling approach, the workflow has been applied to a meander-belt reservoir where large point-bar and channel-fill elements are imaged in seismic. A detailed example is used to illustrate workflows that can be used to build high-resolution sector models in pre-drill contexts, suitable for guiding development plans. An additional example is used to show how to achieve well match for densely drilled sectors, by means of a hybrid approach that combines the new algorithm with traditional geostatistical techniques.It is shown how the workflow allows consideration of point-bar growth styles, as inferred from seismic data, on distribution and geometry of heterogeneities, and how this facilitates the reproduction of geologic features that are important controls on the static connectivity of point-bar reservoirs (e.g., distribution and characteristics of bar-front mud drapes, and of mud-prone packages arising from progressive meander-bend tightening or from downstream fining of deposits beyond the apex of a meander bend). A comparison with traditional variogram-based methods is undertaken to compare metrics that describe intra-point-bar static connectivity and that represent proxies for the degree of compartmentalization of upper-bar sands by mud drapes.