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。
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.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第2期284-290,共7页
Natural Gas Geoscience
基金
中国石油天然气股份公司重大专项(编号:2008E-0601)资助
关键词
斜坡区
坡折带
歧口凹陷
黄骅坳陷
Slope
Slope-break
Qikou sag
Huanghua depression.
