摘要
准确的沉积相空间几何形态及相间配置关系表征是储层非均质性描述的重要内容,但当前常用的随机模拟法如序贯指示模拟、截断高斯模拟均无法有效地解决复杂相间接触关系表征和不同沉积相具有独立各向异性的问题。多高斯场截断模拟可以通过多个高斯场的变差函数定义不同沉积相的各项异性,并结合阈值规则实现对相间复杂空间结构关系的表征。本文首先详细讲解了该方法的基本原理及使用步骤,随后结合河流相储层进行了实际应用,对模拟结果进行分析得到了以下几点认识:多高斯截断模拟法可以有效地对地质模式进行定量控制,不仅能够再现地质体的空间连续性特征,还能再现不同沉积相的不同各向异性以及相间复杂接触关系;应用截断高斯模拟法,对多高斯场变差函数进行准确的迭代拟合使其与根据已知样本数据计算得到的各个沉积相的实验指示变差函数相符合是最终截断模拟模型能够再现实际地质现象非均质性和连续性特征的保证;截断规则及阈值的确定不仅要考虑样本数据反映的岩相比例,还要考虑研究区的沉积模式特征尤其是相间结构关系。此外,相间边界的清晰度很大程度上取决于多高斯分布的变差函数类型与阈值规律的组合关系。
Accurate characterization of complex spatial relationship between facies is essen- tial for fine reservoir description, but traditional estimate and simulation approaches can＇t achieve these goals effectively.Using plurigaussian by combining truncation of multiple GRF and complex lithotype rule,we can represent the complex geological settings.This paper be- gins with a detailed explanation of the plurigaussian and finally this method was presented with a fluvial face reservoir.The analysis results show： not only can the PGS represent the spatial distribution of geological body and honour the sample data,but also it can reproduce complex contact relationships between the sedimentary facies which can＇t be simulated with mono-gaussian techniques.The guarantee of reproducing the heterogeneity and continuity of reservoir is to achieve the consistency between indicator variograms computed from truncated simulation result and experimental indicator variograms according to sample data.The con- struction of lithotype rules should synthesize facies proportion curves and sedimentary mode of actual working area.The smoothness of boundaries between different facies is determined by syntagmatic relation of variogram type of multiple GRF and truncation rule.
出处
《石油化工应用》
CAS
2013年第10期53-57,68,共6页
Petrochemical Industry Application
基金
国家级大学生创新训练项目"储层建模中河流相训练图像生成算法研究"
项目编号:201310425002
关键词
多高斯截断模拟
非均质性
河流相
储层建模
地质建模
随机模拟
plurigaussian
heterogeneity
fluvial facies
reservoir modeling
geological model-ing
stochastic simulation
