惠民凹陷南坡古中生代沉积体系特征及时空演化

Sedimentary systems and spatio-temporal evolution of the Palaeozoic and Mesozoic strata on the southern slope of the Huimin depression, Shandong

关键词:  惠民凹陷  古生代  中生代  沉积体系  时空演化

Key words:  Huimin depression  Palaeozoic  Mesozoic  sedimentary system  spatio-temporal evolution

摘要:

笔者通过胜利油区惠民凹陷南坡地区古生代地层的沉积相发育与分布特点的研究,并结合区域构造运动,揭示了该地区早古生代奥陶纪到中生代侏罗纪的构造和沉积体系发展演化规律。结果表明,整个研究区在早古生代发育了一套碳酸盐潮坪体系,晚古生代为海陆过渡的三角洲沉积体系,中生代为一套陆相河流体系。三角洲体系又包括了石炭纪的海相三角洲和二叠纪的陆相湖泊三角洲。该区在古生代和中生代经历着多期次、多类型的构造-沉积演化,从整个演化过程来看,总体上体现了从海到陆的过程。在空间上,除了在早古生代沉积相对稳定外,晚古生代和中生代均表现了较明显的沉降差异性。

Abstract:

The development and evolution of the Ordovician and Jurassic sedimentary systems are explored on the basis of sedimentary facies distribution and regional tectonism of the Palaeozoic and Mesozoic strata on the southern slope of the Huimin depression, Shandong. The results of research indicate that the study area was covered by a succession of carbonate tidal-flat sedimentary systems during the Early Palaeozoic; terrestrial-marine deltaic sedimentary systems during the Late Palaeozoic, and continental fluvial sedimentary systems during the Mesozoic. The deltaic sedimentary systems consist dominantly of Carboniferous marine deltaic and Permian continental lacustrine deltaic sedimentary systems. The region studied has recorded the multiphase evolution of Palaeozoic and Mesozoic tectonism and sedimentation. In places, some strata are absent due to tectonic uplift. Spatially the differences in subsidence and deposition are noticeable in the Late Palaeozoic and Mesozoic strata.