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低渗透油藏在油田开发中日益重要,做为低渗透油藏显著特征的裂缝,控制着油藏流体渗流系统,制约着油藏开发效果。如何利用常规资料进行裂缝识别和建立裂缝三维模型是当前低渗透油藏开发研究的重点和难点,针对这一问题,笔者进行了有益探索。首先从相似露头区和钻井岩心2个方面对裂缝分布原模型进行深入细致研究,建立裂缝特征知识库;然后从理论角度分析利用双侧向测井识别裂缝的可行性;基于以上研究,采用岩心标定测井法,深入分析总结了利用双侧向测井进行单井裂缝识别的特征,并利用分形克利金理论对井间裂缝进行了预测,最后利用分形随机模拟技术建立了研究区裂缝三维模型。结果表明,利用上述方法建立的裂缝模型与油田开发实践比较吻合,从而证明了该方法的正确性。
Low-permeability reservoirs are increasingly important in the development of oilfields. As a significant feature of fractures in low-permeability reservoirs, low-permeability reservoirs control fluid flow in reservoirs and restrict reservoir development. How to use conventional data to identify cracks and establish fractures 3D model is the key and difficult point in the development of low permeability reservoirs. To solve this problem, the author has made useful exploration. Firstly, the original model of fracture distribution is studied in detail from two aspects of similar outcrops and drilling cores, and the knowledge base of fracture features is established. Then the feasibility of using double lateral logs to identify fractures is analyzed theoretically. Based on the above studies, Calibration logging method, the characteristics of single-well fracture identification by double-lateral logging are analyzed in depth and the fractures between wells are predicted by the fractal Kriging theory. Finally, fractal 3D model of the study area is established by fractal stochastic simulation . The results show that the fracture model established by the above method is in good agreement with the oilfield development practice, which proves the correctness of the method.