As the distribution of barriers and baffles could seriously affect the result of water flooding development, the paper took No. 16 pebbled sandstone member of Donghe reservoir at Middle Tarim as study area. We divided barriers and baffles into different types according to genesis mechanism, analyzed the characteristics of well logging response of different types of barriers and baffles from data of typical wells and predicted the spatial distribution of barriers and baffles and discussed the relationship between barriers and baffles and the distribution of remaining oil. The research shows that muddy interlayer, calcareous interlayer and low-permeability shaly sandstone interlayer are the main types of interlayer in of the study area;calcareous interlayer is at the bottom of the 5th sublayer, muddy interlayer concentrates at the bottom of the 3rd sublayer and low-permeability shaly sandstone interlayer is found sparsely. The vertical permeability of fluid is affected by the interlayers, which results in two oil-water pressure systems. In the same pressure system high-permeability reservoir is water-washing zone and low-permeability reservoir is remaining-oil rich zone. The study on the causes, type and distribution of interlayers, made clear the characteristic of enrichment of remaining oil and distribution of oil and water and provided geological evidence for the development program adjustment of next stage.%针对塔中16东河砂岩油藏含砾砂岩段分布复杂的隔夹层严重制约油田的水驱开发效果，致使油田产量低这一问题，综合运用岩芯、录井以及测井资料，以塔中16含砾砂岩段为解剖对象，划分了该层段内隔夹层成因类型，分析了典型单井的不同类型隔夹层的测井响应特征、预测了隔夹层的空间展布、剖析了隔夹层对剩余油分布的影响。研究表明：含砾砂岩段发育泥质、钙质、低渗透泥质砂岩3类隔夹层；钙质隔夹层主要分布在5小层底部、泥质隔夹层则主要分布在3小层底部、低渗透泥质砂岩夹层则零星分布在各小层砂体内部；隔夹层影响了流体的垂向渗流能力，致使含砾砂岩段形成了2套油水压力系统，在同一个压力系统内，夹层易造成高渗储层水洗严重，低渗部位剩余油富集。通过开展隔夹层成因、类型及分布特征研究，可明确油水分布特征及剩余油的富集部位。
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