为探明开发后期油田的砂体的规模与连通关系，亟需开展孤东油田馆上段发育河流相砂体特征与规模精细表征。基于岩心、测井、地震等相标志综合分析，在密井网的控制下，确定了辫状河、曲流河的沉积特征及其砂体的规模。结果表明，孤东油田馆上段经历了辫状河-曲流河的沉积演化过程，馆上段下部主要发育辫状河储层，发育心滩、辫状河道、溢岸砂微相，馆上段上部发育曲流河储层，发育点坝、废弃河道、决口扇、泛滥平原等微相类型。通过岩-电标定分析，确定了辫状河、曲流河的测井响应特征与砂体发育规律，辫状河河道砂体多期切割叠置，横向上连片分布多分叉，曲流河河道砂体孤立发育，横向上呈条带状发育。在密井网的控制下，定量确定了辫状河、曲流河的砂体发育规模，建立了不同河流类型的砂体厚度与横向宽度的关系，对判识砂体连通及三维地质建模具有重要的指导意义。

In order to comprehend the scale and connectivity of sandbodies in late oilfield development, it is imperative to conduct a detailed characterization of fluvial sandbodies in the upper Guantao Formation of Gudong oilfield. Through comprehensive analysis of core, well logging, and seismic data, the sedimentary characteristics of braided river and meandering river were determined under the control of dense well array. The results indicate that the upper Guantao Formation has undergone a sedimentary evolution process from braided river to meandering river. The lower Guantao Formation exhibits braided fluvial reservoir with braid bar, braid channel, and overbank sand microfacies, while the upper Guantao Formation features meandering fluvial reservoir with microfacies types such as point bar, abandoned channel, crevasse splay, and floodplain. By conducting core-log calibration analysis, the logging response characteristics and sandbody development laws of braided and meandering rivers were determined. The channel sandbody of a braided river is cut and overlapped in multiple stages while being distributed across multiple branches on a plane. On the other hand, the meandering fluvial channel sandbody develops in isolation but forms strips on a plane. Under the control of dense well array, we have quantitatively determined the scale of sandbody development for both braided and meandering rivers. Additionally, the relationship between sandbody thickness and width for different river types were established which holds significant guiding significance for identifying sandbody connectivity and 3D geological modeling.