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四川盆地东北部前陆褶皱-冲断带盐相关构造
引用本文:汤良杰,郭彤楼,余一欣,金文正,李儒峰,周雁.四川盆地东北部前陆褶皱-冲断带盐相关构造[J].地质学报,2007,81(8):1048-1056.
作者姓名:汤良杰  郭彤楼  余一欣  金文正  李儒峰  周雁
作者单位:1. 油气资源与探测国家重点实验室,北京,102249;石油天然气成藏机理教育部重点实验室,北京,102249;中国石油化工股份有限公司科技部,北京,100086
2. 中国石油化工股份有限公司南方勘探开发分公司,昆明,650200
3. 中国石油化工股份有限公司石油勘探开发研究院,北京,100083
基金项目:国家自然科学基金项目(编号40672143,40472107,40172076),国家“973”计划项目(编号2005CB422107,G1999043305),石油天然气成藏机理教育部重点实验室开发基金项目(编号2003-01),中石化科技发展部项目(编号P05073),中石化南方分公司项目(编号2003-04科技)联合资助的成果
摘    要:以中、下三叠统嘉陵江组(T1j)和雷口坡组(T2l)含膏盐碳酸盐岩层系为界,可以将川东北地区划分为3个构造-层序组合,盐下构造-层序组合由震旦系-下三叠统飞仙关组组成,属于一套海相碳酸盐岩层系为主的沉积;盐层构造-层序组合由下三叠统嘉陵江组和中三叠统雷口坡组组成,属于一套含厚层膏盐的海相碳酸盐岩层系;盐上构造-层序组合由上三叠统须家河组和侏罗系、白垩系组成,属于一套陆相碎屑岩沉积。川东北地区发育了一套独特的构造变形样式,主要有基底卷入叠瓦冲断强变形带、基底卷入与盐层滑脱叠合变形带、隐伏盐相关构造滑脱变形带、双重构造、堆垛式三角带构造和背冲断块构造等。由于该区盐岩层厚度相对较薄,盐岩层系总体作为一个大型滑脱层系,控制川东北地区的构造变形。川东北地区主要构造变形机制包括区域挤压缩短作用、盐岩层塑性流动和滑脱作用、构造隆升和剥蚀作用、重力滑动和重力扩展作用等。川东北地区与三叠系盐岩层系有关的构造变形控制该区油气圈闭样式,有利于油气聚集和保存。

关 键 词:盐相关构造  前陆褶皱-冲断带  碳酸盐岩层系  变形机理  四川盆地东北部
修稿时间:2007-04-30

Salt-Related Structures in the Foreland Fold-Thrust Belt of the Northeastern Sichuan Basin, South China
TANG Liangjie,GUO Tonglou,YU Yixin,JIN Wenzheng,LI Rufeng,ZHOU Yan.Salt-Related Structures in the Foreland Fold-Thrust Belt of the Northeastern Sichuan Basin, South China[J].Acta Geologica Sinica,2007,81(8):1048-1056.
Authors:TANG Liangjie  GUO Tonglou  YU Yixin  JIN Wenzheng  LI Rufeng  ZHOU Yan
Abstract:Three tectono-stratigraphic sequences can be divided in the northeaster Sichuan basin according to the Mid-and Lower-Triassic salty and gypsum beds.The sub-salt tectono-stratigraphic sequence,dominated by a marine-facies sedimentary carbonate sequence,is composed of the Sinian and Lower-Triassic Feixianguan Formation.Assemblage of the salt sequence and structure includes the Upper-Triassic Jialingjiang Formation and Mid-Triassic Leikoupou Formation and is characterized by saliniferous marine carbonate measures.The supra-salt sequence is composed of continental clastic rocks belonging to the Upper-Triassic Xujiahe Formation,Jurassic and Cretaceous.A series of specific structural styles,such as intense deformed belt of basement-revolved imbricated thrusts,superimposed deformed belt associated with the basement-revolved and salt detachment,buried salt-related detachment zone,duplex,triangle pile structure and pop-up,are developed in the northeastern Sichuan basin.Relatively thin salt beds in this area may act as a large-scale decollement zone which controls the structural deformation of northeastern Sichuan basin.The deformation mechanisms of northeastern Sichuan basin have a bearing upon the regional compression and shortening,plastic flow and detachment,tectonic upwelling and erosion,gravitational sliding and spreading.The tectonic deformation related to the Triassic in the northeastern Sichuan basin may control the pattern of oil/gas traps,which are favorable to the accumulation and reservation of hydrocarbon.
Keywords:salt-related structure  foreland fold-thrust belt  carbonate measures  deformation mechanism  northeastern Sichuan basin
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