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川东南南川地区构造变形与页岩气富集

汤济广 汪凯明 秦德超 张玥 冯涛

汤济广, 汪凯明, 秦德超, 张玥, 冯涛. 川东南南川地区构造变形与页岩气富集[J]. 地质科技通报, 2021, 40(5): 11-21. doi: 10.19509/j.cnki.dzkq.2021.0502
引用本文: 汤济广, 汪凯明, 秦德超, 张玥, 冯涛. 川东南南川地区构造变形与页岩气富集[J]. 地质科技通报, 2021, 40(5): 11-21. doi: 10.19509/j.cnki.dzkq.2021.0502
Tang Jiguang, Wang Kaiming, Qin Dechao, Zhang Yue, Feng Tao. Tectonic deformation and its constraints to shale gas accumulation in Nanchuan area, southeastern Sichuan Basin[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 11-21. doi: 10.19509/j.cnki.dzkq.2021.0502
Citation: Tang Jiguang, Wang Kaiming, Qin Dechao, Zhang Yue, Feng Tao. Tectonic deformation and its constraints to shale gas accumulation in Nanchuan area, southeastern Sichuan Basin[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 11-21. doi: 10.19509/j.cnki.dzkq.2021.0502

川东南南川地区构造变形与页岩气富集

doi: 10.19509/j.cnki.dzkq.2021.0502
基金项目: 

国家科技重大专项 2017ZX05008-006-005-002

详细信息
    作者简介:

    汤济广(1978-), 男, 副教授, 主要从事油气构造与成藏、非常规油气资源评价教学与科研工作。E-mail: YUtang@yangtzeu.edu.cn

  • 中图分类号: P618.130.2

Tectonic deformation and its constraints to shale gas accumulation in Nanchuan area, southeastern Sichuan Basin

  • 摘要: 南川地区自下古生界海相页岩成气以来,遭受了强烈的构造改造作用,致使页岩气富集规律复杂。为揭示南川地区中新生代构造变形对页岩气富集的制约,通过构造精细解析,以及对演化时序和页岩气富集主控因素的分析,构建了结构模式,恢复了中新生代构造演化过程,厘定了页岩气富集主控因素,进而分析了构造样式与页岩气富集模式的响应关系。研究表明,南川地区整体构造变形自东向西逐渐减弱,存在北段强烈冲断褶皱-断展-断滑、南段强烈冲断褶皱-断滑两种前展式结构模式。中燕山期,主体NE向构造发育,平桥、东胜构造形成,至中燕山期末期,受金佛山隆起以及南川-遵义断层的作用,南段发生构造叠加与改造,早期NE向构造演化为北倾单斜,并在南川-遵义断层东侧发育近南北向阳春沟背斜。受差异构造变形作用,北段断褶带发育背斜型富页岩气构造样式,外缘带为单斜型构造样式,而南段构造叠加带则发育单斜型和背斜型构造样式。页岩气整体保存条件受构造变形方式制约,北段页岩气保存条件由东向西逐渐变好,而南段页岩气保存条件较为复杂,其中北段的低角度单斜、宽缓背斜、较宽缓背斜3类构造样式为有利的页岩气富集构造。

     

  • 图 1  南川地区构造图

    A.南川地区奥陶系五峰组底面构造图;B.南川及邻区地质图
    K2.上白垩统;K1.下白垩统;J3p.蓬莱镇组;J2sn.遂宁组;J2s.沙溪庙组;J2x.新田沟组;J1-2z.自流井组;J1z.珍珠冲组;T3x.须家河组;T2l.雷口坡组;T1j.嘉陵江组;T1d.大冶组;P2.上二叠统;P1.下二叠统;S2lr.罗惹坪组;S1x.小河坝组;S1lm.龙马溪组;O2+3.中上奥陶统;O1d.大湾组;O1f+h.分乡组+红花园组;O1n.南津关组;∈3m.毛田组;∈3g.耿家店组;∈2p.平井组;∈2g.高台组;∈1sl.石龙洞组;∈1t.天河板组;∈1sp.石牌组;Zdn.灯影组

    Figure 1.  Structural map of Nanchuan area

    图 2  南川地区SE-NW向地质剖面图(剖面位置见图 1)

    J-T3x.侏罗系-须家河组;T2l-P2l.雷口坡组-龙潭组;P1m-S2h.茅口组-韩家店组;S1x-O3w.小河坝组-五峰组;O3l-∈.临湘组-寒武系;An∈.前寒武系

    Figure 2.  SE-NW geological profile in Nanchuan area

    图 3  南川地区SW-NE向地质剖面图(剖面位置见图 1, 地层代号同图 2)

    Figure 3.  SW-NE geological profiles in Nanchuan area

    图 4  南川地区中燕山期断层发育演化图

    Figure 4.  Fault development and evolution map in Middle Yanshanian period in Nanchuan area

    图 5  南川地区中新生代构造演化剖面图(见图 1剖面C)

    Figure 5.  Meso-Cenozoic tectonic evolution profile of Nanchuan area(Sea section C in Fig. 1)

    图 6  南川地区页岩气富集模式图

    Figure 6.  Shale gas enrichment model in Nanchuan area

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