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随着油气二次创业的深入,海相地层已成为油气勘探领域的重点.下扬子沉积了巨厚的海相地层,其原型盆地经历了多期次的构造改造.通过对下扬子边界的讨论,对其进行系统的整体分析.在活动论构造历史观和盆地原型分析TSM工作程式的指导下,通过对下扬子晚震旦至中奥陶世残留地层分布状况以及该时期沉积充填过程的分析,确定了晚震旦至中奥陶世下扬子原型盆地的性质为被动大陆边缘,其特征主要表现在硅质碎屑沉积物、碳酸盐岩沉积物和同生断裂现象等方面.该时期碳酸盐岩台地发育成镶边台地,台地有侧向生长现象和向海盆输入沉积物的舌状凸起,以江南断裂为代表的同生断裂表明盆地沉积物的物源始终是从下扬子内部自西北向东南方向单向搬运,这些均表明晚震旦至中奥陶世为成熟的被动大陆边缘.
With the further development of oil and gas, the marine strata has become the focus of oil and gas exploration.In the lower Yangtze sedimentary thick marine strata, the prototype basin underwent several stages of structural transformation.Through the discussion of the lower Yangtze boundary , And systematically analyze it.Under the guidance of tectonic history view and TSM work program of the basin, this paper analyzes the distribution of residual strata from the Late Sinian to the Middle Ordovician in Lower Yangtze River and the sedimentary filling process in this period , The nature of the Lower Sinian to Middle Ordovician Lower Yangtze prototype basin was confirmed to be the passive continental margin, and its characteristics were mainly manifested in the siliceous sediments, carbonate sediments and symbiotic fracture phenomena. The carbonate platform developed into a striped platform with lateral growth on the platform and tongue-shaped bumps that input sediments into the basin. The syngenetic fracture represented by the Jiangnan fault indicates that the source of sediments in the basin is always from the lower Yangtze The interior was transported from northwest to southeast unidirectionally, which indicated that the Late Sinian to Middle Ordovician was a mature passive continental margin.