石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (5): 1074-1083.doi: 10.11743/ogg20190513

• 油气地质 • 上一篇    下一篇

渝东大焦石坝地区差异构造变形

庹秀松1,2, 陈孔全1, 罗顺社1, 汤济广2, 张水山3, 刘其军3   

  1. 1. 长江大学 非常规油气湖北省协同创新中心, 湖北 武汉 430100;
    2. 长江大学 地球科学学院, 湖北 武汉 430100;
    3. 中国石化 江汉油田分公司物探研究院, 湖北 武汉 430035
  • 收稿日期:2018-09-06 修回日期:2019-05-27 出版日期:2019-10-28 发布日期:2019-08-17
  • 通讯作者: 陈孔全(1961-),男,教授,非常规油气。E-mail:30760410@qq.com。 E-mail:30760410@qq.com
  • 作者简介:庹秀松(1992-),男,博士研究生,矿产普查与勘探。E-mail:2766052886@qq.com。
  • 基金资助:
    国家科技重大专项(2017ZX05035001);中国石化科技部项目(P16042,P18057)。

Differential structural deformation of the Dajiaoshiba area,East Chongqing

Tuo Xiusong1,2, Chen Kongquan1, Luo Shunshe1, Tang Jiguang2, Zhang Shuishan3, Liu Qijun3   

  1. 1. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China;
    2. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China;
    3. Geophysical Prospecting Research Institute of Jianghan Oilfield Branch Company, SINOPEC, Wuhan, Hubei 430035, China
  • Received:2018-09-06 Revised:2019-05-27 Online:2019-10-28 Published:2019-08-17

摘要: 在地震资料的基础上,结合区域地质资料,对大焦石坝地区进行分层、分带和分期差异构造变形特征研究,总结了南、北段的差异变形规律,并探讨了南北向乌江断裂构造变形带和大耳山断裂构造变形带的成因机制。结果表明,大焦石坝地区纵向上发育4套构造形变层,平面上由东到西分为冲断褶皱带、逆冲-滑脱褶皱带和滑脱褶皱带,燕山期以来先后遭受南东-北西向、近东西向和北东-南西向3期挤压应力作用。大焦石坝地区为逆冲推覆构造的前锋带,主滑脱层由前寒武系向寒武系转变,自东向西发生前展式递进变形,同时由于齐岳山断层分段性及前寒武系基底滑脱断层的结构差异,导致了近南北向大耳山和乌江断裂构造变形带的形成,使北段、中段和南段自东向西分别表现出冲断作用-压扭作用-断滑作用-滑脱作用、冲断作用-压扭作用-断展作用-滑脱作用和冲断作用-断弯作用-断展作用-滑脱作用的变形规律。

关键词: 前展式递进变形, 差异构造变形, 褶皱带, 大焦石坝地区

Abstract: The structural deformation characteristics of different layers,zones and stages at the Dajiaoshiba area were analyzed based on seismic and regional geological data.Thereafter,we summarized the differential deformation patterns of the north and south sections,and discussed the mechanism for the formation of the S-N oriented Wujiang and Daershan structural fault deformation zones.The results show that four sets of structural deformation layers occur vertically in the Dajiaoshiba area,while horizontally it can be divided into thrust-fold belt,thrust-decollement fold belt and decollement-fold belt from east to west,which have undergone SE-NW-trending,nearly WE-trending and NE-SW-trending compressive stress since the Yanshan Movement.The studied area represents the front belt of the thrust nappe structure,and the major decollement formation shifts from the Precambrian to the Cambrian,which has gone through the piggy-back progressive deformation from east to west.Due to the segmentation of the Qiyueshan fault and the structural difference of the Precambrian basement decollement fault,the composition of east to west deformation zones changes along the trend of the nearly SN-trending Daershan and Wujiang structures,with a deformation pattern of thrusting-compresso-shearing-fault-detaching-decollement in the northern section,thrusting-compresso-shearing-fault-propagation-decollement in the middle section and thrusting-fault-bending-fault-propagation-decollement in the southern section,respectively.

Key words: piggy-back progressive deformation, differential structural deformation, fold belt, Dajiaoshiba area

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