古地理学报 ›› 2025, Vol. 27 ›› Issue (3): 560-577. doi: 10.7605/gdlxb.2025.058

• 岩相古地理学及沉积学 • 上一篇    下一篇

四川盆地中二叠世茅口期构造-沉积分异与峨眉山地幔柱活动的耦合关系*

袁海锋1,2(), 张本健3, 匡明志1,2, 张玺华3, 李文杰1,2, 彭瀚霖3, 陈聪3, 肖钦仁1,2, 王涛1,2, 王炳森1,2, 山述娇3, 李天军3, 袁浩1,2   

  1. 1 成都理工大学油气藏地质及开发工程全国重点实验室,四川成都 610059
    2 成都理工大学能源学院(页岩气现代产业学院),四川成都 610059
    3 中国石油西南油气田公司勘探开发研究院,四川成都 610051
  • 收稿日期:2024-11-09 修回日期:2025-03-14 出版日期:2025-06-01 发布日期:2025-05-29
  • 作者简介:

    袁海锋,男,1980年生,教授,主要研究方向为油气成藏动力学及储层地质学。E-mail:

  • 基金资助:
    *国家自然科学基金项目(41872130); 四川省自然科学基金青年基金项目(2023NSFSC0759)

Coupling of tectonic-sedimentary differentiation and Emeishan mantle plume during the Middle Permian Maokouan in Sichuan Basin

YUAN Haifeng1,2(), ZHANG Benjian3, KUANG Mingzhi1,2, ZHANG Xihua3, LI Wenjie1,2, PENG Hanlin3, CHEN Cong3, XIAO Qinren1,2, WANG Tao1,2, WANG Bingsen1,2, SHAN Shujiao3, LI Tianjun3, YUAN Hao1,2   

  1. 1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China
    2 College of Energy(College of Modern Shale Gas Industry),Chengdu University of Technology,Chengdu 610059,China
    3 Research Institute of Exploration and Development,PetroChina Southwest Oil & Gasfield Company,Chengdu 610051,China
  • Received:2024-11-09 Revised:2025-03-14 Online:2025-06-01 Published:2025-05-29
  • About author:

    YUAN Haifeng,born in 1980,professor,is engaged in research on hydrocarbon accumulation dynamics and reservoir geology. E-mail: .

  • Supported by:
    Co-funded by the National Natural Science Foundation of China(41872130); Young Scientists Fund of the Natural Science Foundation of Sichuan Province(2023NSFSC0759)

摘要:

四川盆地中二叠统茅口组二段滩相白云岩储集层近期获得天然气勘探重大发现,而该滩相白云岩的分布主要受茅口期沉积演化和构造-沉积分异的动力学背景控制。本研究综合野外露头、钻录测井以及牙形刺化石等资料,梳理川中—川北地区茅口组岩石地层和生物地层的对应关系,讨论峨眉山地幔柱活动与茅口期沉积演化的耦合关系,限定构造-沉积分异时间。研究认为: (1)峨眉山地幔柱火山喷发前的地壳隆升控制了茅一段—茅二下亚段沉积期南西高、北东低的碳酸盐岩缓坡沉积格局,茅二上亚段沉积期地幔柱活动驱动碳酸盐岩缓坡演化为碳酸盐岩台地,发生构造-沉积分异,形成绵竹—蓬溪台洼、广元—开江陆棚以及近400 km长的剑阁—丰都大型台缘带; (2)构造-沉积分异始于J. altudaensis牙形刺带,时间为263—262 Ma;之后地幔柱活动增强,广元—开江盆地相向北扩张; (3)川西南地区茅口组沉积期可能存在火山水下喷发事件,都江堰—简阳一带可能发育近东西向的台洼; (4)晚二叠世长兴期绵阳—武胜陆棚以及开江—梁平海槽最晚在茅二上亚段沉积期开始出现雏形。

关键词: 构造-沉积分异, 沉积演化, 峨眉山地幔柱, 茅口组, 四川盆地

Abstract:

Recent significant breakthroughs in natural gas exploration have been achieved in the shoal-facies dolomite reservoirs of Member 2 of the Middle Permian Maokou Formation in the Sichuan Basin. The distribution of these dolomite reservoirs is fundamentally controlled by the dynamic interplay between sedimentary evolution and tectonic-sedimentary differentiation during the Maokouan stage under the influence of the Emeishan mantle plume. Integrating field outcrops,drilling data,well logs,and conodont biostratigraphy,this study establishes the correlation between lithostratigraphic and biostratigraphic frameworks in the central-northern Sichuan Basin,investigates the coupling mechanism between Emeishan plume activity and Maokouan sedimentary evolution,and precisely constrains the timing of tectonic-sedimentary differentiation. Key findings include: (1)Pre-eruptive crustal uplift induced by the Emeishan mantle plume established a SW-high/NE-low carbonate ramp during the deposition of Member 1 to Lower Member 2 of Maokou Formation. Subsequent plume-driven tectonic activity transformed the ramp into a differentiated platform system during Upper Member 2 deposition,forming the Mianzhu-Pengxi intraplatform depression,Guangyuan-Kaijiang shelf,and the 400 km-long Jian'ge-Fengdu platform-margin belt. (2)Tectonic-sedimentary differentiation initiated within the Jinogondolella altudaensis conodont zone(263-262 Ma),with subsequent intensification of plume activity triggering northward expansion of the Guangyuan-Kaijiang basin facies. (3)Subaqueous volcanic eruptions likely occurred in southwestern Sichuan during the Maokouan stage,potentially developing an E-W trending intraplatform depression along the Dujiangyan-Jianyang area. (4)Prototypes of the Mianyang-Wusheng shelf and Kaijiang-Liangping intraplatform trough,characteristic of the Late Permian Changhsingian stage,were established no later than the depositional stage of the Upper Member 2 of Maokou Formation.

Key words: tectonic-sedimentary differentiation, sedimentary evolution, Emeishan mantle plume, Maokou Formation, Sichuan Basin

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