下扬子区伸展拆离构造

发布时间：2018-04-27 07:19

  本文选题：盆—岭构造 + 多米诺式半地堑　； 参考：《石油实验地质》2016年01期

【摘要】：在郯庐断裂带以东,包括苏北—南黄海地区在内的下扬子区,晚白垩世—古近纪时期,在太平洋板块由南向北俯冲消减的运动过程中,东亚大陆被牵引,发生了由南向北的大型左行平移走滑运动和岩石圈上地壳递进减薄拉张的伸展拆离构造运动。从苏、皖南的南陵—广德、句容—常州断陷盆地开始,经苏北东台、盐阜坳陷—南黄海南部的青岛坳陷,再向北至南黄海北部的烟台坳陷,形成了3条呈NE—近EW走向的断陷盆地构造带。盆地为具有南断北超的箕状半地堑结构,呈多米诺骨牌式自南向北排列;并与其间近E-W走向的南京—南通—勿南沙和滨海—南黄海中部的崂山古生界地层的核部杂岩褶隆带,共同构成较大区域范围的盆—岭构造。这一期构造运动一方面再次改造了下扬子区海相古生代盆地,为海相古生界烃源岩系在经历了抬升剥蚀后的再次深埋,以及晚期二次生烃提供了可能性;另一方面也控制了中新生代油气的生成与聚集分布。
[Abstract]:In the Lower Yangtze region east of the Tanlu fault zone, including the Huang Hai area of northern Jiangsu and southern Jiangsu, the East Asian continent was towed during the late Cretaceous to Paleogene period during the subduction and subduction of the Pacific plate from south to north. A large left-lateral lateral strike-slip movement and a progressive thinning and tensioning extension of the upper lithosphere occurred from the south to the north. Starting from the Su, Nanling Guangde, Jurong Changzhou faulted basin in southern Anhui, through the Dongtai basin in northern Jiangsu, the Qingdao depression in the south of Yanfu depression and the southern Huang Hai depression, and then to the Yantai depression in the north of Huang Hai in the north, Three faulted basin tectonic belts with NE-near EW strike were formed. The basin is a half-grain-shaped semi-graben structure with the southern fault-north superstructure, which is arranged from south to north in a domino-type manner, and the core complex fold belt of the Paleozoic strata of the Laoshan Mountains in the middle of the Nanjing-Nantong-Fenansha and Binhai South Huang Hai, which is near the E-W strike. The basin-ridge structure in a large area is formed together. On the one hand, the tectonic movement remade the marine Paleozoic basins in the Lower Yangtze area, which provided the possibility for the marine Paleozoic source rock series to be buried again after the uplift and denudation, as well as the late secondary hydrocarbon generation. On the other hand, it also controls the generation and accumulation distribution of Mesozoic and Cenozoic oil and gas.
【作者单位】： 中国石化石油勘探开发研究院无锡石油地质研究所;
【基金】：中国石化导向项目(2014-ZS-YTB010)资助
【分类号】：P618.13
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本文编号：1809770