准噶尔盆地南缘前陆褶皱冲断带构造滑脱层厘定

IDENTIFICATION OF THE DETACHMENTS IN THE FORELAND FOLD-THRUST BELT IN SOUTHERN MARGIN OF JUNGGAR BASIN

董臣强 孙自明 洪太元

Dong Chenqiang Sun Ziming Hong Taiyuan

中国地质大学, 北京, 100083 2. 中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083 3. 中国石油大学, 北京, 102249

China University of Geosciences, Beijing 100083, China 2. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China 3. China University of Petroleum, Beijing 102249, China

准噶尔盆地南缘前陆褶皱冲断带位于天山造山带北侧,经历了多期构造演化的叠加,形成了不同类型的构造滑脱层。构造滑脱层的存在不仅是制约该区盖层滑脱型构造样式形成演化的关键因素,而且也是造成深层与浅层构造不协调的主要原因。通过大量地表露头的观察和地震资料的解释,系统识别和厘定了中二叠统芦草沟组和红雁池组、下侏罗统八道湾组、中侏罗统西山窑组、白垩系吐谷鲁群、古近系安集海河组和新近系塔西河组等共6个与大套泥岩、膏泥岩和煤系地层相关的主要构造滑脱层。不同地区往往发育有一个或多个构造滑脱层,层位上具有自东向西逐渐变新的趋势。构造滑脱层的识别和厘定对该区构造建模和准确落实地下含油气构造具有重要意义。

The foreland fold-thrust belt in the southern margin of Junggar Basin is located in the north side of the Tianshan orogenic belt,experienced superimposition and juxtaposition of multi-prototype basins from the Carboniferous and formed a series of possible detachments,which are the main factors controlling formation and evolution of skin-typed structural styles and causing the unconformities between the upper and the lower structures.Based on comprehensive analysis of the outcrops and interpretation of seismic data in this area,six detachments are identified,which are the Middle Permian Lucaogou and Hongyanchi Formations,the Lower Jurassic Badaowan Formation,the Middle Jurassic Xishanyao Formation,the Cretaceous Tugulu Group,the Palaeocene Anjihaihe Formation and the Neocene Taxihe Formation from the deep to the shallow.There exists one or more detachments in different segments of the foreland fold-thrust belt whose eras have the tendency of becoming new from east to west.The identification of the detachments are significant to the structure modeling and trap determination.

中国石油化工股份有限公司科研项目(P03009)

https://doi.org/10.11781/sysydz200702138