岩性油气藏 ›› 2026, Vol. 38 ›› Issue (4): 148–156.doi: 10.12108/yxyqc.20260413

• 地质勘探 • 上一篇    下一篇

川西北汉南古陆周缘震旦系陡山沱组沉积特征及油气地质意义

李洪玺1(), 李柱正1, 曹永洪2,3, 赵磊1, 付宇1, 邢超超2,3, 甯濛2,3   

  1. 1 中国石油川庆钻探工程公司 地质勘探开发研究院， 成都 610051
    2 成都理工大学 沉积地质研究院， 成都 610059
    3 油气藏地质及开发工程全国重点实验室（成都理工大学）， 成都 610059
  • 收稿日期:2025-12-24 修回日期:2026-01-15 出版日期:2026-07-01 发布日期:2026-07-06
  • 第一作者:李洪玺（1979—），男，博士，正高级工程师，主要从事开发地质、气藏评价及剩余油气方面的研究工作。地址：（610051）四川省成都市成华区建设北路1段83号。Email:lihx_dyy@cnpc.com.cn。
  • 基金资助:
    中国石油集团揭榜挂帅项目“万米超深层取心技术与工具研究”(2023ZG19)

Sedimentary characteristics and hydrocarbon significance of Sinian Doushantuo Formation in the periphery of Hannan paleo-uplift, northwestern Sichuan Basin

LI Hongxi1(), LI Zhuzheng1, CAO Yonghong2,3, ZHAO Lei1, FU Yu1, XING Chaochao2,3, NING Meng2,3   

  1. 1 Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Company Ltd, Chengdu 610051, China
    2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
    3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
  • Received:2025-12-24 Revised:2026-01-15 Online:2026-07-01 Published:2026-07-06

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摘要：

近年来，扬子克拉通震旦系陡山沱组油气勘探取得了新进展。通过野外露头剖面的实测和实验室分析相结合，系统总结了川西北汉南古陆周缘陡山沱组的地层分布及沉积特征，并揭示了构造对陡山沱组烃源岩发育的控制机制。研究结果表明：①汉南古陆东、西两侧在陡山沱组沉积期发育不同的沉积体系，西侧是以碎屑岩-碳酸盐岩混积为特征的稳定缓坡沉积体系；东侧则经历了“斜坡充填—稳定陆棚—碳酸盐岩缓坡”完整沉积演化序列。②古陆两侧的沉积分异特征受攀西—汉南岛弧俯冲-转换边界控制，西侧对应俯冲边界，沉积地形宽缓；东侧处于转换边界，坡度陡、沉降持续，为深水缺氧环境与优质烃源岩的发育提供了有利构造-古地理条件。③汉南古陆东侧（镇巴—城口一带）因构造活动启动早、持续沉降、缺氧还原环境及热液活动驱动的高古生产力，形成了高TOC值（2.75%~4.76%）的优质烃源岩，西侧受构造稳定、保存条件差等限制，仅发育规模有限、品质中—差的烃源岩，TOC均值为1.20%~1.65%。

关键词: 地层对比, 沉积特征, 烃源岩, 构造-沉积分异, 陡山沱组, 震旦系, 汉南古陆, 四川盆地

Abstract:

In recent years, significant progress has been made in hydrocarbon exploration of Sinian Doushantuo Formation in the Yangtze craton. Combided field outcrop profiles observations and laboratory analysis, the stratigraphic distribution and sedimentary characteristics of Doushantuo Formation in the periphery of Hannan paleo-uplift in northwestern Sichuan Basin were systematically summarized, and the control mechanism of the tectonic on the development of source rocks in Doushantuo Formation were revealed. Research results show that: （1） Diffe-rent sedimentary systems were developed during the sedimentary period of Doushantuo Formation in the eastern and western sides of Hannan paleo-uplift. The western side developed a stable gentle slope sedimentary system characterized by mixed clastic and carbonate rocks,while the eastern side underwent a complete sedimentary succession of “slope filling-stable shelf-carbonate gentle slope”. （2） The sedimentary differentiation characteristics of both sides of Hannan paleo-uplift are controlled by the subduction-transition boundary of Panxi-Hannan island arc.The western side corresponds to the subduction boundary,with wide and gentle sedimentary terrain.The eastern side is located at the transition boundary, with steep slopes and continuous subsidence, providing favorable tectonic-paleogeographic conditions for deep-water anoxic environments and the development of high-quality source rocks. （3） The eastern side of Hannan paleo-uplift (Zhenba-Chengkou area) contains high-quality source rocks, with high TOC values (2.75%-4.76%) due to earlier-initiated tectonic activity, continuous subsidence, oxygen deficient reducing environment, and high paleoproductivity driven by hydrothermal activity. Due to constraints such as tectonic stability and poor preservation conditions, the western side develops limited-scale, medium-poor quality source rocks, with average TOC values of 1.20%-1.65%.

Key words: stratigraphic correlation, sedimentary characteristics, source rock, tectonic-sedimentary differentiation, Doushantuo Formation, Sinian, Hannan paleo-uplift, Sichuan Basin

中图分类号: 

  • TE122.2

图1

四川盆地西北缘构造位置（a）及绵竹地区震旦系陡山沱组岩性地层柱状图（b）（据文献[9,18]修改）"

图2

汉南古陆东西两侧震旦系陡山沱组岩性对比及烃源岩有机碳含量分布（数据来源为文献[5,10]）"

图3

川西北汉南古陆西缘宁强左家湾剖面陡山沱组野外露头照片"

图4

川西北汉南古陆西缘绵竹清平剖面陡山沱组野外露头照片"

图5

川西北汉南古陆周缘陡山沱组沉积期沉积相图（据文献[10]修改）"

图6

川西北汉南古陆及其周缘板块运动示意图（据文献[26]修改）"

图7

川西北汉南古陆周缘陡山沱组烃源岩分布模式图"

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