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为了深化对琼东南盆地深水区沉积体系的认识,基于琼东南盆地深水区2D和3D地震资料,发现琼东南盆地深水区发育大量的块体流沉积.通过对块体流沉积进行精细刻画,识别出一些典型的块体流沉积特征:滑移体、陆坡陡崖、搬运块体、残余块体、挤压脊、逆冲断层以及块体流顶部的滞留沉积等.陡倾陆坡上块体流以杂乱反射为特征,地层变形剧烈,而宽缓陆坡上块体流以发育地层变形微弱的滑移体为特征,反映出陆坡角度对于块体流发育及其内部结构特征有明显的控制作用.大规模块体流沉积作为深海沉积的重要组成部分,对于深海沉积物的空间展布具有重要的控制作用:一方面,通过不规则顶面影响随后沉积物的输送通道和沉积体的内部结构;另一方面,对已沉积的地层产生直接的侵蚀作用,破坏原始沉积地层的内部结构,造成潜在储层中地质流体的逸散.因此,鉴于块体流对深水沉积体系重要的影响,有必要加强对块体流沉积的精细研究,以更好地指导深水油气勘探.
In order to deepen the understanding of the sedimentary system in the deepwater area of the Qiongdongnan Basin, based on the 2D and 3D seismic data of the deepwater area in the Qiongdongnan Basin, it is found that a large amount of block flow deposition is developed in the deepwater area of the Qiongdongnan Basin.By elaborating the block flow sedimentation, Some typical characteristics of block flow deposition are as follows: slip body, steep slopes, moving blocks, residual blocks, compression ridges, thrust faults and sediment deposition at the top of block flow, etc. Block flow on steep slopes It is characterized by disorderly reflection and stratigraphic deformation. On the gentle slope, the block flow is characterized by the weak deformation of the strata, which shows that the slope angle has significant control over the development of block flow and its internal structure. As an important component of deep-sea sediment, large-scale block flow deposition plays an important role in controlling the spatial distribution of deep-sea sediments. On the one hand, the internal structure of subsequent sediment transport channels and sediments is influenced by irregular top surfaces; On the other hand, it has a direct erosion effect on the deposited strata, destroying the internal structure of the original sedimentary strata and causing the dissipation of geological fluids in the potential reservoir. Body flow a significant impact on the deep-water sedimentary system, it is necessary to strengthen the study of the fine block current deposits, in order to better guide deepwater oil and gas exploration.