石油与天然气地质 ›› 1991, Vol. 12 ›› Issue (4): 376-386.doi: 10.11743/ogg19910403

• 论文 • 上一篇    下一篇

中、下扬子区古生代盆地基底拆离式改造与油气领域

丁道桂1, 朱樱1, 陈凤良2, 刘斌3   

  1. 1. 地质矿产部石油地质中心实验室, 江苏无锡;
    2. 山东建材工业学院, 淄博;
    3. 同济大学, 上海
  • 收稿日期:1990-11-23 修回日期:1991-04-15 出版日期:1991-12-25 发布日期:2012-01-16
  • 基金项目:

    "七·五"国家重点科研攻关54-02项目的三级专题;地质行业科学技术发展基金.

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

Ding Daogui1, Zhu Ying1, Chen Fengliang2, Liu Bing3   

  1. 1. Central Laboratory of Petroleum Geology, MGMR, Wuxi;
    2. Shandong Institute of Building Material Industry, Zibo;
    3. Tongji University, Shanghai
  • Received:1990-11-23 Revised:1991-04-15 Online:1991-12-25 Published:2012-01-16

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摘要：

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NE至近EW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NW至近EW 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。

关键词: 中下扬子区, 古生代盆地, 陆内俯冲, 陆壳挤压, 基底拆离, 盖层滑脱

Abstract:

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 NE,/i>-near EW trend Sichuan, Hubei, Hunan, Guizhou-Jiangsu, South Anhui frontal folding-thrusting belt which formed under the northward compression-overthrusting of the Jiangnan-Xuefeng basement detaching napping-uplift belt was super-imposed and further reformed by the NW-near EW trend foreland folded-thrust belt caused by the southward obduction and thrusting-compression of the Qingling-Dabie-Jiaonan Orogenic Belts. Finally, the tectonic framework of opposite thrusting formed at both the south and north sides of the Yangtze Platform. The main trap types for hydrocarbon accumulation may occur at the following places:the trailing adge of basement detaching-thrusting uplift belt, the decollement folds at the faulted flat overlain by gliding nappes, X-type joint groups at footwall ramp, the fault-extending-decollement folding superimposed by Meso-Cenozoic fault-depressed basins within the faulted flat of lower thrusting sheet, the monadnock on ancient erosive surface, the mixed folds of high and duplex thrust structures at blind thrusted front.