松辽盆地南部海坨子油田特低渗透储层裂缝识别及预测模型

Fracture Identification and Prediction Model of Ultra-Low Permeability Reservoir in Haituozi Oilfield,Southern of Songliao Basion

海坨子油田属于特低渗透裂缝性油藏,其开发实践表明:微裂缝为流体渗流的主要通道,能否准确描述储层中裂缝分布形态,直接关系到油藏开发效果。本文以钻井取心资料、成像测井资料及铸体薄片分析资料为基础,对海坨子油田储层中微裂缝的形成机理、形态及产状特征进行了研究,得到了裂缝描述的详细参数,并形成了一套适用于该类型油藏微裂缝系统描述及有效识别的方法。以此为基础,利用随机建模的方法,建立了海坨子油田海21-4试验区微裂缝的分布DFN模型,预测了裂缝的分布密度、分布方位及裂缝大小,为油藏数值模拟双重介质模型的建立提供了基础。

Development practice of Haituozi Oilfield which is an ultra-low permeability reservoir shows that the micro-fractures provide the main flow channel for reservoir fluid, so accuracy fracture description is directly related to reservoir development effect. In this paper, based on core data, imaging logging data and casting thin sections data, the fracture genetic type, species distribution, the authors reasearched occurrence characterization to get the detailed parameters of fracture characterization, and construct a system description and the authors reasearched occurrence characterization effective recognition method of ultra-permeability fractured reservoir. According to the research results, a fracture distribution model is built by using stochastic modeling method to predict distribution density, azimuth and joint opening of the reservoir fracture. This provides a basis of dual permeability model for reservoir numerical simulation.