南海北部琼东南盆地中央峡谷成因新认识

发布时间：2018-06-07 03:06

本文选题：南海北部 + 琼东南盆地　；参考：《海洋学报》2016年11期

【摘要】：通过对区域构造断裂体系和逐渐连片的高分辨率三维地震资料的精细解析,认识到琼东南盆地中央峡谷的形成机制除了与晚中新世区域构造变动、大规模海平面下降、充足物源供给以及凹槽型古地形特征等因素相关之外,还存在另外一个非常重要因素:峡谷底部早期隐伏断裂带的存在。研究表明:琼东南盆地中央坳陷带发育平行于陆架坡折的大规模深水峡谷,峡谷底部发育大型走滑断层以及走滑断层派生出一系列次级断层形成的地层破碎带,认识到峡谷的形成、规模以及展布方向均受断裂带影响;相应地峡谷的充填及演化亦是受物源、海平面变化、重力流作用等多种因素共同作用和相互叠加的过程。从而为研究经历了裂陷期和坳陷期盆地演化过程形成的大型峡谷提供了科学依据。
[Abstract]:Based on the fine analysis of the regional tectonic fault system and the high-resolution 3-D seismic data of the gradually connected basin, it is recognized that the formation mechanism of the central canyon in the southeast Qiongdong basin is not only related to the regional tectonic changes of the late Miocene, but also to the large-scale sea level decline. In addition to sufficient material supply and the characteristics of grooving paleotopography, there is another very important factor: the existence of the early concealed fault zone at the bottom of the canyon. The study shows that the central depression zone of Qiongdongnan basin developed large-scale deep-water canyons parallel to the continental shelf slope break, and large-scale strike-slip faults and strike-slip faults were developed at the bottom of the canyons to derive a series of stratigraphic broken zones formed by secondary faults. It is recognized that the formation, size and distribution direction of canyons are all affected by the fault zone, and the filling and evolution of canyons is also a process of interaction and superposition of various factors, such as material source, sea level change, gravity current and so on. This provides a scientific basis for the study of the large canyons formed during the basin evolution process during the rift and depression periods.
【作者单位】：中海石油(中国)有限公司湛江分公司;中海油能源发展股份有限公司钻采工程研究院湛江实验中心;
【基金】：国家科技重大专项(2011ZX05025)
【分类号】：P736.1

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