地学前缘 ›› 2025, Vol. 32 ›› Issue (5): 38-51.DOI: 10.13745/j.esf.sf.2025.5.10

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松辽盆地国际大陆科学钻探松科2井基底变质岩研究

王璞珺1(), 高传承1, 高有峰1,2,*(), 杨卓龙1, 唐鑫1, 郑常青1, 刘硕1, 刘海波1, 李宏浩1, 高翔1, 高远3, 王成善3, 万晓樵3   

  1. 1.吉林大学 地球科学学院, 吉林 长春 130061
    2.吉林大学 古生物学与地层学研究中心, 吉林 长春 130026
    3.中国地质大学(北京) 地球科学与资源学院, 北京 100083
  • 收稿日期:2025-01-17 修回日期:2025-05-25 出版日期:2025-09-25 发布日期:2025-10-14
  • 通信作者: 高有峰
  • 作者简介:王璞珺(1959—),男,教授,博士生导师,主要从事盆地地质和火山岩储层、沉积学和火山学的研究与教学,长期担任松辽盆地国际大陆科学钻探总地质师(2005—2022年)。E-mail: wangpj@jlu.edu.cn
  • 基金资助:
    国家自然科学基金项目(41790453);国家自然科学基金项目(41472304);国家自然科学基金项目(42102129);国家自然科学基金项目(42102135);国家自然科学基金项目(41972313);吉林省科技厅科技发展项目(20170101001JC);国家重点科技攻关项目(2019YFC0605402);中国地质调查局项目(DD20189702)

Study on basement metamorphic rocks of the ICDP borehole SK2 in the Songliao Basin

WANG Pujun1(), GAO Chuancheng1, GAO Youfeng1,2,*(), YANG Zhuolong1, TANG Xin1, ZHENG Changqing1, LIU Shuo1, LIU Haibo1, LI Honghao1, GAO Xiang1, GAO Yuan3, WANG Chengshan3, WAN Xiaoqiao3   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China
    2. Research Center of Paleontology and Stratigraphy, Jilin University, Changchun 130026, China
    3. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2025-01-17 Revised:2025-05-25 Online:2025-09-25 Published:2025-10-14
  • Contact: GAO Youfeng

摘要:

松辽盆地国际大陆科学钻探工程及相关研究历时18年(2005—2023年),实施“三井四孔”技术方案,完成总钻探进尺14 455.06 m,总取心进尺8 528.19 m,收获岩心总长度8 261.67 m,总取心率96.87%。这使得松辽盆地成为全球首例钻穿整个沉积盖层和盆地基底顶部构造层并获取连续完整岩心的含油气盆地。这些岩心和测井录井及地震资料为全球和区域重大地质事件研究提供了全球最高精度的地质档案,从而大大提升了松辽盆地研究的国际学术地位。然而,与这项工程相关的三个基本技术问题至今还没有得到妥善解决。一是三井四孔的取心层位和取心率还没有准确统计结果和相关报道;二是松科2井的完钻井深及其相关报道尚不够清晰;三是松科2井最后100 m到底钻遇到了什么?相关的岩石类型、地层序列和测井资料,迄今未见客观翔实的科学报道。作为松辽盆地国际大陆科学钻探核心工作组之一的地质研究团队,作者拟通过本文重点回答上述3个问题。我们基于松辽盆地国际大陆科学钻探松科2井的全取心资料,通过岩石类型及变质变形特征研究,在井深7 000~7 108.88 m的中泥盆统基底序列中识别出一套动力变质岩,详细研究和报道了该套变质杂岩的岩性组合与地层序列。另外,关于松科2井的完钻井深和三井四孔的钻探取心数据在本文中也给出了翔实的统计结果。

关键词: 松辽盆地, 国际大陆科学钻探, 松科2井, 完钻井深7 108 m, 变质杂岩, 中泥盆统基底

Abstract:

A long-term International Continental Scientific Drilling Project (ICDP) in the Songliao Basin has been carried out for 18 years from 2005 to 2023. Its technical objective is to drill three wells comprising four boreholes throughout the entire basin strata and obtain a continuous and complete geological record of the basin formation. The total drilling footage is 14455.06 m and total drilling core sampling depth is 8528.19 m. The recovered core length is 8261.67 m, then the overall core recovery rate is 96.87%. This makes the Songliao Basin the first petroliferous sedimentary basin in the world to date that has been drilled through the entire basin formation and obtained a continuous core record of the entire sedimentary basin sequence from the surface down to the underlying metamorphic basement rock. These cores along with logging and seismic data provide the highest-precision geological archives for studying global and regional important geological events. the relevant research has significantly elevated the international academic standing of the Songliao Basin. However, there are still three significant technical problems that have not been resolved up to now. They include (1) The precise statistical results and documentation of coring intervals and recovery rates for the four boreholes are still lacking; (2) The final drilling depth of the ICDP borehole SK2 and its related formal reports remain unclear; (3) The geological features encountered in the final 100 m of the SK2 borehole including rock types, stratigraphic sequences, and logging data have yet to be objectively and comprehensively reported. As the key geological research team for the Songliao Basin ICDP working group, we address the three problems mentioned above. Based on a comprehensive investigation of the full-core data from the ICDP borehole SK2, we identified a suite of dynamic metamorphic rocks within the Middle Devonian basement sequence in the SK2 borehole, spanning the final core interval from 7000 m to the total depth (TD) of 7108.88 m. According to the analysis of the rock types and metamorphic-deformation characteristics, this study provides for the first time a detailed documentation of the lithological assemblages and stratigraphic sequences of these metamorphic core complexes found deep in the SK2 borehole. Additionally, the final drilling depth of the SK2 Well (7108.88 m) and the comprehensive statistical results for the coring data of the three wells and four boreholes are formally presented here for the first time.

Key words: Songliao Basin, International Continental Scientific Drilling Project (ICDP), the ICDP borehole SK2, final drilling bottom depth of 7108 m in the SK2 borehole, metamorphic complexes, Middle Devonian basement sequence

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