【摘要】 歧口凹陷古近纪为典型的箕状断陷盆地,斜坡背景广泛分布,发育断裂、挠曲、侵蚀、沉积等多种成因类型坡折带。以高精度三维地震资料精细构造解析为基础,对各种类型坡折结构特点、发育演化及成因模式等进行深入分析,探讨古近纪坡折带发育对沉积的控制作用。研究认为歧口凹陷发育构造、沉积、侵蚀等多种成因类型坡折带,构造坡折带样式受断裂特征及其组合控制,主要表现为单阶式和多阶式;坡折带形成及演化受古近纪基底先存构造、伸展、走滑等多重因素共同控制;构造作用形成的沟槽、转换带形成沉积物输入与其在盆内分散的通道,坡折带控制沉积相带的分异,物源大小及与斜坡倾向匹配关系控制层序样式及物源波及范围。更多还原

【Abstract】 The Paleogene Qikou sag is a typical half-graben,with slope setting wide spread and several different genetic-type slope-breaks(i.e.faulted,flexure,eroded & sedimentary).Based on high resolution 3D seismic interpretation,we analyzed structure characteristics,evolutionary process & genetic origin of each type of the slope-break.The genetic origin of slope-break in the Qikou sag is of tectonic,sedimentation and erosion.The tectonic slope-break is controlled by characters and styles of faults,associated with simple and multi-step.The formation and evolution of slope-break was controlled by tectonic events including stretch in cap-rock,paleo-structure & strike-slipe in the Paleogene base-rock.The trench gap or transfer zone generated by tectonic events played as the channels for sedimentary input and diffusion.The slope-break made the sedimentary faces separate each other.Both amounts of sedimentary provenances and slope character constrain the stack style and the affected area of the sedimentary provenances.更多还原