中、下扬子区古生代盆地基底拆离式改造与油气领域

BASAL DETACHING REFORMATION OF PALEOZOIC BASINS IN CENTRAL AND LOWER YANGTZE REGIONS AND THEIR HYDROCARBON PROSPECTINGS

丁道桂 朱樱 陈凤良 刘斌

Ding Daogui Zhu Ying Chen Fengliang Liu Bing

导源于古特提斯海关闭的印支运动,使扬子和华北地台分别向大别-胶南造山带的陆内俯冲和挤压,使扬子地台本身也产生了以基底拆离-盖层多层次滑脱为主要方式的变形改造。由江南-雪峰基底拆离推覆隆起带向北挤压所形成的至近向延伸的川鄂湘黔-苏皖南前缘褶皱-冲断带,在燕山晚期又受到了秦岭-大别-胶南造山带向南仰冲推覆形成的至近 向前陆褶皱冲断带进一步的叠加和改造,最终形成扬子地台南北两侧相向对冲的构造格局。文中还提出了中下扬子区与基底拆离-盖层滑脱构造有关的可能的油气聚集模式。

The Indo-China movement derived from the closure of the Tethys resulted in sub-duction of the Yangtze and North China Platforms to Dabie-Jiaonan Orogenic Belts. The polyphase and multilayer basement detaching and thrust-nappe of Qinling-Dabie-Jiaonan Orogenic Belts resulted in super-imposition of a series of nappe sheets in different grades,different scales and different deformation intensities, which was the main tectonic style for the formation of the orogenic belts. The orogenic belts then obducted to the Yangtze and North China Platforms with the displacement of 20-40km respectively during late Yen-shanian. In the process of the northward subduction, the Yangtze Platform itself had been experienced the reformation dominated by basement detaching and multilayer decollement of caprocks. The

10.11743/ogg19910403