石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (3): 764-777.doi: 10.11743/ogg20230318

• 油气地质 • 上一篇    下一篇

四川盆地及其周缘下寒武统麦地坪组-筇竹寺组层序充填和演化模式

吴冬1,2(), 邓虎成1,2(), 熊亮3, 曹凯旋2, 董晓霞3, 赵勇3, 魏力民3, 王同3, 马若龙1,2   

  1. 1.成都理工大学 油气藏地质及开发工程国家重点实验室, 四川 成都 610059
    2.成都理工大学 能源学院, 四川 成都 610059
    3.中国石化 西南油气分公司 勘探开发研究院, 四川 成都 610041
  • 收稿日期:2022-12-31 修回日期:2023-04-07 出版日期:2023-06-01 发布日期:2023-06-05
  • 通讯作者: 邓虎成 E-mail:lisandpw@163.com;denghucheng@cdut.cn
  • 第一作者简介:吴冬(1987—),男,博士、副研究员,沉积学和储层地质学。E?mail: lisandpw@163.com
  • 基金项目:
    国家自然科学基金项目(42072182);四川省科技计划杰出青年科技人才项目(2020JDJQ0058)

Sequence filling and evolutionary model of the Lower Cambrian Maidiping-Qiongzhusi formations in Sichuan Basin and on its periphery

Dong WU1,2(), Hucheng DENG1,2(), Liang XIONG3, Kaixuan CAO2, Xiaoxia DONG3, Yong ZHAO3, Limin WEI3, Tong WANG3, Ruolong MA1,2   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    2.College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    3.Exploration and Development Research Institute of Southwest China Oil and Gas Branch,SINOPEC,Chengdu,Sichuan 610041,China
  • Received:2022-12-31 Revised:2023-04-07 Online:2023-06-01 Published:2023-06-05
  • Contact: Hucheng DENG E-mail:lisandpw@163.com;denghucheng@cdut.cn

摘要:

四川盆地及其周缘下寒武统筇竹寺组页岩气资源丰富,是重要的页岩气产气层段之一。由于该套地层埋藏深、资料少且地质条件复杂,对其开展的层序地层研究较为薄弱,这严重制约了后续研究和生产。首先对四川盆地及其周缘早寒武世构造-沉积背景开展研究,在此基础上结合岩性、颜色、测井曲线、微量元素、古生物和地震反射同相轴等特征,对麦地坪组-筇竹寺组层序地层开展研究,提出层序划分思路,将麦地坪组-筇竹寺组从下往上依次划分为4个Ⅲ级层序。进而厘清层序地层空间分布规律,建立受全球板块张性活动控制的四川盆地及其周缘麦地坪组-筇竹寺组“早期窄盆差异沉积,后期广盆稳定分布”的层序演化模式。该演化模式对深化认识四川盆地寒武纪构造-沉积格局、推动沉积成藏等地质研究及促进深部页岩气勘探开发具有一定意义。

关键词: 演化模式, 层序地层, 麦地坪组, 筇竹寺组, 下寒武统, 四川盆地

Abstract:

The Lower Cambrian Qiongzhusi Formation in the Sichuan Basin and on its periphery is rich in shale gas resources and has been proven to be one of the important shale gas pay zones in the basin. Due to the deep burial depth, few data and complex geological conditions, the research on its sequence stratigraphy has been relatively weak, having seriously restricted the follow-up research and development. The study on the Early Cambrian tectono-sedimentary setting of the Sichuan Basin and on its periphery, coupled with lithology, rock color, logging curve, trace elements, paleontology, seismic reflection event and other characteristics, is carried out to further explore the sequence stratigraphy of the Maidiping-Qiongzhusi formations, with the idea for the sequence division proposed. As a result, the Maidiping-Qiongzhusi formations are divided into four third-order sequences from bottom to top. By revealing the spatial distribution pattern of the sequence stratigraphy, we establish a sequence evolutionary model of “differential sedimentation in early narrow basin, and stable sedimentation in later wide basin” for the Maidiping-Qiongzhusi formations in the Sichuan Basin and on its periphery under the control of global plate extensional activity. The sequence evolutionary model will be of help to deepening understanding of the Cambrian tectono-sedimentary setting in the Sichuan Basin, promoting geological research on sedimentary reservoirs, and serving the exploration and development of deep shale gas.

Key words: evolutionary model, sequence stratigraphy, Maidiping Formation, Qiongzhusi Formation, Lower Cambrian, Sichuan Basin

中图分类号: