This paper approaches the reservoir distribution feature of the lithologic oil and gas accumulation in Member 3 of Nadu Formation in the north of Tiandong depression in Baise Basin, Guangxi,China.The authors mainly use the method of seismic geomorphology under the control of palaeogeomorphy.Firstly,they determine the minimum research unit by building high-frequency stratigraphy.Secondly,on the basis of seismic attributes,drilling characteristics and geological settings,they analyzes the feature of the sedimentary microfacies and the reservoir distribution under the control of different kinds of microfacies.The shore shallow lake sedimentary facies and the delta front sedimentary facies are the mainly sedimentary types in Member 3 of Nadu Formation.And the beach bar sand stone is the best reservoir,and the subaqueous distributary channel sandstone is the better reservoir.According to the guiding thought that the reservoir is controlled by the sedimentary facies,while the oil and gas accumulation is controlled by reservoirs,the beach bar sandstone is the main target for further exploration.%探讨百色盆地田东凹陷北部那三段岩性油气藏储层分布规律。通过建立高频等时层序格架确定最小研究单元，在最小等时研究单元内通过古地貌控制下的地震地貌研究，综合地震属性、钻井特征及研究区地质背景，研究沉积微相展布规律，以及各类沉积微相控制下的储层分布特征。那三段主要为滨浅湖及三角洲前缘沉积，其中滨浅湖滩坝砂为Ⅰ类储层，三角洲前缘水下分流河道砂次之。根据相控储、储控藏的指导思想，滨浅湖滩坝砂应为主要勘探目标。
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