吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (2): 392-404.doi: 10.13278/j.cnki.jjuese.20190265

• 油页岩成矿与资源评价 • 上一篇    下一篇

松辽盆地北部青一段油页岩地球化学特征及其记录的古湖泊学信息

郑国栋1,2, 孟庆涛3,4, 刘招君3,4   

  1. 1. 山东省鲁南地质工程勘察院, 山东 济宁 272100;
    2. 自然资源部采煤沉陷区综合治理工程技术创新中心, 山东 济宁 272100;
    3. 吉林大学地球科学学院, 长春 130061;
    4. 吉林省油页岩及共生能源矿产重点实验室, 长春 130061
  • 收稿日期:2019-12-09 出版日期:2020-03-26 发布日期:2020-03-31
  • 作者简介:郑国栋(1991-),男,工程师,硕士,主要从事地质勘查与矿山生态地质工作,E-mail:zhengguodong1991@163.com
  • 基金资助:
    国家自然科学基金项目（41872103）；中国地质调查局项目（1212011220800）

Geochemical Characteristics and Paleolimnological Information of Oil Shale in 1st Member of Qingshankou Formation in Northern Songliao Basin

Zheng Guodong1,2, Meng Qingtao3,4, Liu Zhaojun3,4   

  1. 1. Lunan Geological Engineering Investigation Institute of Shandong Province, Jining 272100, Shandong, China;
    2. Engineering Innovation Center for Restoration&Reclamation in Mining-Induced Subsidence Land of MNR, Jining 272100, Shandong, China;
    3. College of Earth Sciences, Jilin University, Changchun 130061, China;
    4. Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province, Changchun 130061, China
  • Received:2019-12-09 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by National Natural Science Foundation of China (41872103) and Project of China Geological Survey (1212011220800)

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摘要： 油页岩地球化学特征及其记录的古湖泊学信息是揭示油页岩成矿富集规律的关键佐证。根据含油率、TOC、岩石热解、元素分析、生物标志化合物检测及有机显微组分分析，精细刻画了松辽盆地北部ZY1井青一段油页岩的地球化学特征，并分析了其记录的古湖泊学信息，探讨了古湖泊对油页岩有机质富集的控制作用。结果表明：青一段发育8层中等偏好品质的油页岩，下部为高品质油页岩富集层段；油页岩的含油率和TOC质量分数相关性极好，处于未熟—低成熟度演化阶段，生烃潜力大；油页岩中含丰富的萜类和甾类化合物，有机质类型主要为Ⅰ型，有机质来源主要为层状藻占优势的湖泊水生生物。地球化学参数指示，青一段下部古湖泊生产力呈现3个低→高的旋回，对应的古湖泊水体盐度呈现为3个半咸水-咸水旋回、古湖泊水体氧化还原性表现为还原-强还原-还原的厌氧环境，其中旋回Ⅱ后期湖泊生产力最高，对应的水体盐度最高、还原性最强。表明湖泊富营养化造成的高湖泊生产力是青一段高品质油页岩有机质富集的物质基础，盐度分层控制下强还原的湖底环境是高品质油页岩有机质富集的良好保存条件。

关键词: 油页岩, 地球化学, 古湖泊学, 青一段, 松辽盆地

Abstract: The geochemical characteristics and paleolimnological information of oil shale are the key evidence to reveal the rule of metallogeny and enrichment of oil shale. Based on the analyses of TOC, oil yield, rock pyrolysis, element, biomarker compound,and organic maceral, geochemical characteristics of oil shale in the 1st Member of Qingshankou Formation in Well ZY1 in northern Songliao basin the were refinedly characterized, paleolimnological information recorded by the oil shale was analyzed, then the control effect of paleolake on organic matter enrichment of oil shale was discussed. The results show that there are 8 layers of medium-high quality oil shale in the 1st Member of Qingshankou Formation, and the high quality oil shale is mainly in the lower part. The TOC of oil shale has good correlation with the oil yield. Seen from the thermal evolution, the oil shale is in the immature-low mature stage with high hydrocarbon potential. Abundant steranes and terpanes are detected from the oil shale samples. The organic matter type of oil shale is mainly Ⅰ, and the main source of organic matter is lake aquatic organisms dominated by lamalginite. The paleolacustrine productivity of the lower part can be divided into three cycles by geochemical parameters, correspondingly the water salinity of paleolake shows three cycles from semi-saline to saline, and the redox property of paleo-lake shows reduction-strong reduction-reduction. And the paleolacustrine productivity of the late cycle Ⅱ is the highest, corresponding to the highest water salinity and the strongest reducibility. It is suggested that the high lake yield caused by lake eutrophication is the material basis of organic matter enrichment of high-quality oil shale in the 1st Member of Qingshankou Formation, and the strong reduction environment of bottom water controlled by salinity stratification is favorable for the accumulation of organic matter in high-quality oil shale.

Key words: oil shale, geochemical, paleolimnology, 1st Member of Qingshankou Formation, Songliao basin

中图分类号: 

  • P618.12
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