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川南天宫堂地区反转构造特征与演化

Characteristics and Evolution of Reverse Structures in the Tiangongtang Area, Southern Sichuan

Environment and Resource / 2026,8(1): 114-118 / 2026-03-05 55 47

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• Authors: 陈珂磷¹ 陈伟¹ 文冉² 樊骐铖² 张渝¹ 余养里¹
• Information:

  1. 西南石油大学地球科学与技术学院，成都；
  2. 四川长宁天然气开发有限责任公司，成都

• Keywords:
  Southwestern Sichuan Basin; Tiangongtang; Extensional structure; Tectonic inversion; Structural evolution
  川南; 天宫堂; 拉张; 反转; 演化
• Abstract: The Tiangongtang area，located on the southwestern margin of the Sichuan Basin，is a key target zone for marine shale gas exploration. The multiphase tectonic superimposition in this region has resulted in a complex tectonic evolution history. Through comprehensive interpretation and analysis of 3D seismic data，this study reveals for the first time that the area exhibited extensional fault-depression characteristics during the Late Caledonian. By integrating geometric analysis of tectonic deformation，it is determined that the Tiangongtang area underwent three major deformation periods: Late Caledonian extensional fault-depression，terminal Caledonian compressional inversion， and intense Mesozoic-Cenozoic compression. Additionally，the regional kinematic evolution process was established through kinematic reconstruction using balanced restoration techniques. This paper systematically identifies the seismic response characteristics of early fault depressions，elaborates on the geometric patterns and kinematic mechanisms of inverted structures，and discusses the influence of multi-stage structural superposition on the preservation and enrichment of shale gas，thereby providing an important geological basis for shale gas exploration in the complex structural area of southern Sichuan Basin. 天宫堂地区位于四川盆地西南缘，是海相页岩气的重要勘探目标区，其多期构造叠加作用导致构造演化历史复杂。本研究通过三维地震资料综合解释分析，首次揭示了该区加里东晚期具有伸展断陷构造特征。综合构造变形几何解析，明确了天宫堂地区经历加里东晚期拉张断陷，加里东末期挤压反转以及中新生代强烈挤压3个主要的变形时期，并应用平衡恢复技术建立了区域运动学演化过程。本文系统识别了早期断陷的地震响应特征，阐述了反转构造的几何样式与运动学机制，探讨了多期构造叠加对页岩气保存与富集的影响，为川南复杂构造区页岩气勘探提供了重要的地质依据。
• DOI: https://doi.org/10.35534/er.0801014 (registering DOI)
• Cite: 陈珂磷，陈伟，文冉，等．川南天宫堂地区反转构造特征与演化［J］．环境与资源，2026，8（1）：114-118.