文33断块沙二下亚段剩余油分布规律及主控因素分析

Distribution Characteristics of Residual Oil in the Lower Member of Es_2 of W33 Fault Block and Suggestions for Tapping Potential

摘要: 剖析剩余油形成的主控因素以及分布规律是提高油田动用程度及采收率的关键举措，可为油田的开发方案调整提供依据。尤其是我国东部的复杂断块油藏，这类油藏断块小且破碎，储层地质特征认识难度大，长期的注水开发导致油田剩余油分布关系认识不清，挖潜难度大。基于此，论文以东濮凹陷文南油田文33断块沙二下亚段为研究对象，综合利用研究区的地质、测井以及生产动态资料，在油藏数值模拟基础之上，刻画剩余油的分布规律，揭示了剩余油富集的机理。结果表明：断层遮挡、微构造控制、岩性尖灭、井网完善程度是这类油藏剩余油形成的主要控制因素。针对不同类型的剩余油，提出了新钻井、侧钻井等措施来挖潜剩余油。研究成果为油田的效益开发提供了依据，同时也为类似油藏的剩余油挖潜提供了方法参考。

Abstract: Analyzing the main controlling factors and distribution patterns of residual oil formation is a key measure to improve the degree of oilfield utilization and recovery, and can provide a basis for adjusting the development plan of the oilfield. Especially in the complex fault block reservoirs in the eastern part of China, these reservoirs have small and fragmented fault blocks, making it difficult to understand the geological characteristics of the reservoir. Long term water injection development has led to unclear understanding of the distribution relationship of remaining oil in the oilfield, making it difficult to tap potential. Based on this, the paper takes the lower sub section of Sha2 in Wen33 fault block of Wennan oilfield in Dongpu depression as the research object, comprehensively utilizes geological, logging, and production performance data of the study area, and on the basis of reservoir numerical simulation, characterizes the distribution pattern of remaining oil and reveals the mechanism of remaining oil enrichment. The results indicate that fault occlusion, microstructure control, litho logical pinching, and well network perfection are the main controlling factors for the formation of remaining oil in such reservoirs. New drilling and lateral drilling measures have been proposed to tap into the potential of different types of remaining oil. The research results provide a basis for the efficient development of oil fields, and also provide a method reference for tapping the remaining oil potential of similar reservoirs.