【摘要】 根据盆地及构造演化特征,同时结合地震、钻井等基础资料,确定了松辽盆地北部上白垩统四方台组和明水组层序地层的划分方案,分析了四方台组和明水组内的层序构型和内部沉积特征,松辽盆地在晚白垩世处于挤压环境下湖盆萎缩时期的沉积,主要发育河流和泛滥平原相沉积,局部发育滨浅湖、三角洲相沉积,沉积物以红褐色、绿色和灰白色为主,整体反映了氧化-半氧化环境。另外四方台组发育的河道砂岩可以作为良好的储层,同时多期断裂的活动又连通了下覆的油气,为浅层的油气成藏提供了充足的油源,其上层序Ⅰ晚期广泛发育的厚层泥岩有效的防止了下覆油气的散失。松辽盆地北部浅层复杂的构造运动和有效的储盖组合,使得该层位具备油气勘探的潜力。更多还原

【Abstract】 Based on basin structural evolution characters,combining seismic and drilling data,sequence stratigraphy classification criterion of Sifangtai formation and Mingshui formation,upper Crataceous,north Songliao basin,is confirmed,also,the sequence configuration and inner sedimentary character of Sifangtai formation and Mingshui formation are analyzed.Songliao basin was in a press environment in Late Crataceous period,fluvial facies and flood plain facies are mainly developed,shallow lake and delta facies only occurred in local area.Sediments are mainly mahogany,green and off-white,which reflect oxidized and half-oxidized environment.On the other hand,the channel sand developed in Sifangtai formation can be favorable reservoir.In the same time,multiple phase fracture movement connects subjacent hydrocarbon,which provides rich oil sources for shallow layer oil accumulation.Argillite,widely developed in the late period of sequence Ⅰ,can effectively protect subjacent hydrocarbon.Complicated tectonic movement and effective accumulation-cap rock combination of shallow layer,north Songliao basin,make this layer possess potentiality of exploration activity.更多还原