The Apure river is the largest tributary of the Orinoco river basin in the Venezuelan plains, it transports considerable amounts of sediments in the range of coarse sand to clay, and its distribution is fundamental to understand the processes of sedimentation in the different fluvial environments. However, little attention has been given to its sedimentary features. We present a field investigation of the different streams of the anastomosis system, which are controlled by a change in the underlying lithostratigraphy of the channel. We analyze the grain size distribution of the sediments in the different fluvial environments to understand the patterns of evacuation and the transport mechanisms under conditions of variable energy. We examine seven sections distributed in an area of 65 km², where the distribution of the morphosedimentary environments from a combination of data of Landsat 8 images, Geographic Information Systems (GIS) and sedimentological samples in the field were stablished. We found a predominance of fine to medium silt (71%) in relation to the clay (18%) and sand (11%). This variation is mainly associated to the existence of controls of lithological origin. The C-M diagram suggest that the sediments were transported in a graded to uniform suspension. This study reveals that sorting and transport of sediment in the anastomosis system of the study area is mainly influenced by the hydrodynamic of the flow stream. This study requires additional validation; however, it supports that changes in the amount and distribution of grain size within the fluvial system affect the morphology of the channel in anastomosis rivers, and it help to improve the present understanding of the sedimentological records and the geomorphological changes, determine the stability of the channel, and its environmental effects.

Apure河是委内瑞拉平原奥里诺科河盆地的最大支流，它从粗砂到黏土的范围内输送了大量的沉积物，其分布对于了解不同河流环境中的沉积过程至关重要。但是，对其沉积特征的关注很少。我们目前对吻合系统的不同流进行现场调查，这些流受通道潜在岩相的变化所控制。我们分析了不同河流环境中沉积物的粒度分布，以了解在可变能量条件下的疏散模式和输送机制。我们研究了分布在65 km ^2内的七个路段，其中建立了结合Landsat 8影像，地理信息系统（GIS）和野外沉积学样本数据的形态沉积环境的分布。我们发现，相对于粘土（18％）和沙子（11％）而言，细粉至中等粉砂（71％）占优势。这种变化主要与岩性起源控制的存在有关。CM图表明，沉积物以分级至均匀悬浮的方式运输。这项研究表明，研究区的吻合系统中沉积物的分类和运输主要受水流的水动力影响。这项研究需要额外的验证；但是，它支持河流系统内晶粒尺寸的数量和分布的变化会影响吻合河中河道的形态，