Data of core analyses,logging curves,laboratory tests and seismic profiles,were employed in the analyses of the Cretaceous Quantou Formation in southeast uplift of southern Songliao Basin to understand its reservoir characteristics, sedimentary facies types and configuration of sedimentary system.The results show that the formation is dominated by oxi-dized purple sandstone and pink siltstone.Reservoirs are tight with rather low porosity and permeability and contain mainly quartz,feldspar,debris and trace minerals.Heavy Mineral Assemblage Analysis Method and Sand Content Analysis were used to reveal the controlling factors of the basin.It shows that three major fluvial branches,namely Lishu-Sangshutai, Changchun-Nongan and Yushu-Fuyu,controlled the basin.Sand content decreases gradually from east to west along the edge of the basin to another depression.The formation features in rapid sedimentation of coarse grains which formed fans in steep slopes and rivers in gentle slopes.Stratigraphically speaking, the basin contains sequence V-q1 which mainly developed braided river deposits and alluvial fan deposits;Sequence V-q2 and V-q3 which mainly developed alluvial fan, braided river, meandering river depositional system, during its transition from braided river to meandering river, and sequence V-q4 which developed the meandering river deposits and completed the process of turning from braided river to meandering river.Meanwhile,Changchun and Yushu branches converged in Changchun Ridge anticline belt and formed fluvial deposits during the late stage of the formation.%根据岩心、电测曲线、录井、分析化验和地震等资料，分析了松辽盆地南部东南隆起区白垩系泉头组储层特征、沉积相类型以及沉积体系的空间配置。东南隆起区泉头组岩性以氧化较强的紫红色砂岩和粉砂岩沉积为主，储层成分主要由石英、长石、岩屑及微量造岩矿物组成，属低孔、低渗型致密储层。结合重矿物组合和砂岩百分含量分析法确定了盆地主要受梨树－桑树台、长春－农安和榆树－扶余三大水系控制，自东向西，沿着沉积盆地边缘至凹陷区方向，砂岩百分含量逐渐变小。泉头组沉积整体上表现为沉降速率快、粗粒沉积物快速充填的特点，具有陡坡成扇、缓坡成河的沉积特征。层序V－q1主要发育辫状河沉积和冲积扇沉积，层序V－q2和层序V－q3为从辫状河沉积过渡为曲流河沉积的过程，主要发育了冲积扇、辫状河和曲流河沉积体系，层序V－q4辫状河到曲流河的过渡结束，完全表现出曲流河沉积特征，长春－农安与榆树－扶余两个水系在此时期于长春岭背斜带汇聚，形成了泉头组末期的河流沉积。
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