【摘要】 应用三维地震、钻井和测井等资料,对歧北凹陷进行层序地层学研究。研究区古近系可划分为3个二级层序,11个三级层序。歧北凹陷斜坡区发育断裂坡折和挠曲坡折两种构造坡折带类型。坡折带的发育演化具有明显的阶段性和继承性:早期为断裂坡折带,晚期为挠曲坡折带。不同类型坡折带层序构成样式及内部体系域构成不同,断裂坡折带控制了低位扇三角洲砂体以及构造-岩性复合圈闭的发育,而挠曲坡折带除了对砂体有控制作用外,更突出地表现为对地层超覆以及岩性圈闭发育的控制。坡折带附近是非构造圈闭发育的有利部位,进一步勘探的潜力巨大。更多还原

【Abstract】 The study of sequence stratigraphy is carried out in central Huanghua Depression using 3D seismic data,drilling,and well logging data.The Paleogene of the studied area can be divided into three second-order sequences,and 11 third-order sequences.Two kinds of structural slope-break are developed in the Qibei slope: faulted slope-break and flexural slope-break.The development and evolution of the slope-breaks are episodic and successive: in early period,it is faulted slope-break;in later period,it is flexural slope-break.Different kinds of slope-breaks have different sequence stratigraphic patterns and inner systems tracts.The faulted slope-breaks control the development of lowstand fan delta sandbodies and combination structural-lithologic traps,while the flexural slope-breaks not only control the development of sandbodies,but more apparently control the development of stratigraphic overlap and lithologic traps.The surrounding areas of the slope-breaks are favorable for the development of non-structural traps,and have great potential for exploration.更多还原