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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 in Qikou sag is a typical half-graben rift basin, and the slope background is widely distributed. Faults such as faults, flexures, erosion and sediments are developed. Based on the detailed structure analysis of 3D seismic data with high precision, the characteristics of various types of slope-break structures, development and evolution, and genesis patterns are analyzed in depth, and the control of sedimentation by the development of slope break in Paleogene is discussed. The study suggests that the Qikou Depression is characterized by a variety of genetic types such as tectonic, sedimentary and erosion slope faults. The structural slope break zone pattern is controlled by faults and its combination control, and is mainly characterized by single-step and multi-step types. The formation and evolution of slope break zone Controlled by multiple factors such as the pre-existing structure, extension and slip of the Paleogene basement; trenches formed by tectonics, transition belts forming sediment inputs and their channels dispersed in the basin, and slope break zones control the differentiation of sedimentary facies , The size of the provenance, and the matching of slope propensity with the sequence stratigraphy and source range.