沉积相控建模法的系统误差及消除方法

A DISCUSSION ON SYSTEMATIC ERROR OF SEDIMENTARY FACIES-CONTROLLED RESERVOIR MODELING AND SUGGESTIONS

相控建模方法的2个关键因素是储层概念模型的建立和沉积相类型的划分,决定了储层非均质性的类型及强度,是相控模型精度的主控因素。沉积相控建模思路及工作方法决定了相控模型精度受人为影响,结合储层非均质性分析,目前常用的"优势相"方法划分沉积相具有固有缺陷,在定性分析的基础上,从模型正演的角度对这一点进行了论证。分析表明,细分地层框架是这一问题的有效解决办法。进而提出高分辨率层序地层精细格架约束下的岩石相控建模思路,在保障建模单元等时性的同时,提高储层模型的精细程度。实际工作表明,岩石相控建模方法很大程度上排除了人为划分优势相而带来的系统误差,从方法本身出发克服了相控建模方法的这一缺陷,对油田开展精细油藏描述工作具有重要的指导意义。

There are two key factors in the faciescontrolled modeling, the building of conceptual reser voir model and the classification of sedimentary facies, which decide the type of heterogeneity and the model precision. In terms of principles and methodology, the sedimentary faciescontrolled modelling can not exclude errors from human influence. Reservoir heterogeneity analysis shows that the tradi tional method of facies analysis using predominant facies has intrinsic shortages. We discussed this problem with forward modeling on the basis of qualitative depiction in this paper and the lithofacies controlled modeling method under the framework of high resolution isochronous stratigraphy was used based on further subdivision of stratigraphic formations. The application shows that this method can help build a finer model and wipe off the systematic error introduced by the workers in the predomi nant facies method. The lithofacies controlled modeling method can provide a more accurate model, which is of great significance in the fine reservoir description of oil fields.