【摘要】 通过对鄂尔多斯盆地延长组钻井、测井及地震等资料分析,寻找作为层序界面的冲刷侵蚀面与不整合面,认为延长组岩石地层单元的划分存在穿时性。延长组沉积时期鄂尔多斯盆地为克拉通盆地,其沉积层序特征:①三级层序在盆地内厚度变化不大,发育稳定;②沉积坡折带为主要的坡折类型,不会形成巨厚的低位体系域砂体;③物源控制了湖平面之上砂体的分布,坡折带控制了湖平面之下砂体的分布;④整个层序结构具有多物源多旋回充填特征。更多还原

【Abstract】 Based on the drilling,logging and seismic data,the right scour erosion surfaces and the unconformities as sequence boundaries can be found.There is time through in the division of lithostratigraphic units in Yanchang formation.In the sedimentary period of Yanchang formation,Ordos basin is a craton basin,which have special sedimentation sequence features.①The three-order sequences growth are stable totally,with little change of the thickness in Ordos basin.②Sedimentary slope-break belt is the main type in the glacis depression basin,it can not form thick sand bodies in the low stand systems.③Above the lake level,the distribution of sand-bodies is controlled by sediment source.Below the lake level,the distribution of sand-bodies is controlled by slope-break belt.④The whole sequence has the filling characteristics with multiprovenance and multicycle.更多还原