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天然气地球科学

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淮南潘谢矿区二叠系泥页岩构造热演化特征

刘会虎，胡宝林，徐宏杰，张文永，郑凯歌，程乔   

  1. 1.安徽理工大学地球与环境学院，安徽 淮南 232001；
    2.安徽省煤田地质局勘查研究院，安徽 合肥 230088;
    3.中煤科工集团西安研究院有限公司,陕西 西安 710054;
    4.福建省煤田地质勘查院,福建 福州 350005
  • 收稿日期:2014-02-13 修回日期:2015-04-07 出版日期:2015-09-10 发布日期:2015-09-10
  • 作者简介:刘会虎（1978-），男，江西九江人，副教授，博士，主要从事非常规天然气地质与勘探开发研究和教学工作. E-mail:xixiinformation@163.com.
  • 基金资助:

    国家自然科学基金项目（编号：41302129;41402140）；山西省煤层气联合研究基金资助项目（编号：2012012008）；安徽省国土资源厅公益性项目（编号：2012-g-17）；安徽省自然科学基金（编号：1408085QE88）联合资助.

Tectonic-thermal Evolution Characteristics of Permian Mud Shale in Panxie Mining Area of Huainan

LIU Hui-hu，HU Bao-lin，XU Hong-jie，ZHANG Wen-yong，ZHENG Kai-ge，CHENG Qiao   

  1. 1.School of Earth and Environment,Anhui University of Science & Technology,Huainan 232001,China;
    2.Exploration Research Institute of Anhui Coal Geological Bureau,Hefei 230088,China;
    3.China Coal Technology and Engineering Group Xi′an Research,Xi′an 710054,China;
    4.Fujian Exploration Institute of Coalfield and Geology,Fuzhou 350005,China
  • Received:2014-02-13 Revised:2015-04-07 Online:2015-09-10 Published:2015-09-10

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摘要：

采用镜质组反射率古温标和古热流法恢复了淮南潘谢矿区晚古生代以来的埋藏史、构造沉降史和二叠系泥页岩的热演化史，并探讨了其生烃的地质意义。研究结果表明:淮南潘谢矿区二叠系经历了早二叠世—中侏罗世末期的稳定沉积阶段、晚侏罗世早期—白垩纪末期的迅速抬升阶段、古近纪早期—古近纪中末期的重新沉积阶段、古近纪中末期至新近纪末期的抬升稳定阶段及第四纪早期以来的缓慢的沉降过程；盆地地温演化与构造埋藏—沉降史过程相一致，古热流经历了二叠纪至侏罗纪末的稳定阶段、晚侏罗世末期至古近纪中末期的迅速降低阶段、古近纪中末期后的平缓稳定阶段。二叠系烃源岩从二叠纪中晚期至中侏罗世进入成熟期的早期—中晚期，至晚侏罗世末期热演化终止；页岩气形成过程包括早二叠世—晚侏罗世生物成因气和热成因的伴生湿气生成、晚侏罗世—白垩纪末期气藏的再次补充与整体构造破坏、古近纪早—中末期局部层位的热成因气和生物气生成、古近纪末期至新近纪末期构造抬升的再次破坏4个阶段；研究区不同钻孔二叠纪地层埋藏和抬升时间一致，因沉降程度和抬升剥蚀速率的细微差异导致沉降埋藏和抬升剥蚀程度、热演化程度有所差异，但生烃过程总体一致。

关键词: 潘谢矿区, 二叠系, 泥页岩, 埋藏—沉降史, 热演化

Abstract:

Burial history,tectonic-sedimentary history of Panxie mining area in Huaina area,thermal evolution history of Permian mud shale since Late Paleozoic are reconstructed by the vitrinite reflectance geothermometer and paleo-heat flow method.The geological significance of hydrocarbon generation from Permian mud shale is discussed.The results show that the Permian experienced the stable sedimentary stage in the Early Permian-late stage of Middle Jurassic,the rapid uplift from the early stage of Late Jurassic to Late Cretaceous,the re-deposit from the Early Paleocene to the Middle-Late Paleocene,the stable uplift from the Middle-Late Paleocene to the Late Neogene,and the slow deposit since Early Pleistocene in the study area.The geothermal evolution of basin is consistent with the course of the burial-sedimentary history,the paleo-heat flow experienced stable stage from Permian to Late-Jurassic,the drastic decrease from the end of Late Jurassic to the end of Paleogene and the subsequent smoothly stabilization.Permian source rocks enter the early to middle-late stage at the mature stage from the Middle-Late Permian to the Middle Jurassic,and the maturation ended  in the end of Late Permian.The formation of shale gas includes four stages such as the generation of bacterial gas and thermogenic gas from Early Permian to Late Jurassic,the replenishment and the whole tectonic destruction of gas reservoir from Late Jurassic to Late Cretaceous,the generation of bacterial gas and thermogenic gas in some Paleogene strata,the second tectonic destruction of gas reservoir from Late Paleogene to Early Quaternary.The burial and uplift periods of Permian from different boreholes are consistent.There is a little difference in the sedimentary and uplift degree.The thermal evolution degree is caused by the subtle difference from the sedimentary degree and the uplift-erosion rate,but the hydrocarbon generation from different boreholes is generally consistent.

Key words: Panxie mining area, Permian, Mud shale, Burial-sedimentary history, Thermal evolution

中图分类号: 

  • TE12

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