曲流复合砂带内部单一河道的识别方法研究

Research on the Identification Method of Single Channels within Braided Sand Belts of Meandering Rivers

摘要: 针对复合河道砂体相互之间切叠严重、单一河道砂体识别难的问题，为满足特高含水后期油田调整挖潜的需要，利用现代沉积为指导，建立了复合砂体内部垂向沉积间歇面识别方法、沉积缺失层位识别方法、冲刷面识别方法，实现了单井单层沉积微相的精准识别；形成了同一单元中单一河道平面识别方法，利用三维视窗内多角度栅状分析技术，精准描述了同一沉积单元，不同河道的边界界限。应用注示踪剂监测资料对河道识别成果进行了验证，符合率达到90.4%，验证了研究成果的可靠性，该方法在大型复合河道砂体内部，对单一期次河道的识别中具有十分重要的研究价值。

Abstract: In response to the serious overlap between composite channel sand bodies and the difficulty in identifying single channel sand bodies, in order to meet the needs of adjusting and tapping the potential of oil fields in the later stage of ultra-high water content, using modern sedimentation as guidance, a method for identifying vertical sedimentary intermittent surfaces, sedimentary missing layers, and erosion surfaces within composite sand bodies has been established, achieving accurate identification of single well and single layer sedimentary microfacies; a single channel plane recognition method has been developed within the same unit, utilizing multi-angle grid analysis techniques within a 3D window to accurately describe the boundary boundaries of different channels within the same sedimentary unit. The application of tracer monitoring data has been validated for the identification of river channels, with a compliance rate of 90.4%, verifying the reliability of the research results. This method has important research significance for the identification of single-stage river channels within large composite river sand bodies.