西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (5): 66-79.DOI: 10.11885/j.issn.1674-5086.2022.08.26.02

• 地质勘探 • 上一篇    下一篇

上扬子五峰组—龙马溪组页岩有机质富集机理

陈雷1,2,3, 董建华1,2,3, 胡月4, 计玉冰5, 任官宝5   

  1. 1. 西南石油大学地球科学与技术学院, 四川 成都 610500;
    2. 天然气地质四川省重点实验室, 四川 成都 610500;
    3. 中国石油天然气集团有限公司碳酸盐岩储层重点实验室西南石油大学研究分室, 四川 成都 610500;
    4. 甘肃省地质矿产勘查开发局第三地质矿产勘查院, 甘肃 兰州 730050;
    5. 中国石油浙江油田公司, 浙江 杭州 311100
  • 收稿日期:2022-08-26 发布日期:2024-11-07
  • 通讯作者: 董建华,E-mail:992098463@qq.com
  • 作者简介:陈雷,1985年生,男,汉族,湖南益阳人,教授,博士,主要从事沉积与储层地质学、非常规油气地质学等相关研究与教学工作。E-mail:cl211@126.com
    董建华,1996年生,男,汉族,甘肃武威人,博士研究生,主要从事非常规油气地质等方面的研究。E-mail:992098463@qq.com
    胡月,1997年生,女,汉族,甘肃武威人,硕士,主要从事非常规油气地质等方面的研究工作。E-mail:1920443952@qq.com
    计玉冰,1989年生,男,汉族,安徽合肥人,硕士,主要从事油气地质综合等方面的研究工作。E-mail:jiyb85@petrochina.com.cn
    任官宝,2000年生,男,汉族,四川达州人,硕士,主要从事非常规地质等方面的研究工作。E-mail:296027311@qq.com
  • 基金资助:
    国家自然科学基金青年科学基金(41602147);中国石油西南石油大学创新联合体科技合作项目(2020CX020000)

Mechanism of Organic Matter Enrichment in the Wufeng Formation–Longmaxi Formation Shale in the Upper Yangtze Platform

CHEN Lei1,2,3, DONG Jianhua1,2,3, HU Yue4, JI Yubing5, REN Guanbao5   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500, China;
    3. Research Branch of Southwest Petroleum University, Key Laboratory of Carbonate Reservoirs, CNPC, Chengdu, Sichuan 610500, China;
    4. The Third Institute of Geology and Minerals Exploration and Development, Lanzhou, Gansu 730050, China;
    5. Zhejiang Oilfield Company, PertoChina, Hangzhou, Zhejiang 311100, China
  • Received:2022-08-26 Published:2024-11-07

摘要: 以上扬子地区五峰组龙马溪组底部页岩为研究对象,通过总有机碳含量测试、主微量以及稀土元素等数据对其有机质富集机理进行研究。结果表明: 1)研究区五峰组—龙马溪组底部页岩沉积于被动大陆边缘环境,构造稳定,有利于有机质富集。2)各种地质因素对于有机质富集具有不同的控制作用,其中,古生产力对五峰组龙马溪组底部页岩有机质富集影响不显著,而陆源输入产生一定稀释性效应;五峰组—龙马溪组底部页岩沉积期环境为贫氧—厌氧、中等滞留环境,有利于有机质的富集与保存,但由于龙马溪组底部沉积时期的水体环境较五峰组时期略微开放,导致水体环境对于五峰组和龙马溪组两套黑色页岩有机质保存的控制作用有一定差异。3)五峰组和龙马溪组底部两套页岩有机质富集具有差异性。其中,五峰组页岩的有机质富集为生产力滞留环境协同控制发育模式,龙马溪组底部页岩的有机质富集为保存—开放—上升洋流控制模式。

关键词: 有机质富集机理, 海相页岩, 五峰组—龙马溪组, 上扬子地区, 主控因素

Abstract: The study takes the shale at the bottom of the Wufeng–Longmaxi Formation in the Upper Yangtze Platform as the research object. The organic matter enrichment mechanism of this set of black shale was studied through the test of organic carbon content, major, trace and rare earth elements and other data. The results show that: the shale at the bottom of the Wufeng–Longmaxi Formation in the study area was deposited in a passive continental margin setting with tectonic stability, which was conducive to the enrichment of organic matter; different geological factors exert varying degrees of control over organic matter enrichment, wherein paleoproductivity has shown a non-significant impact on the organic matter enrichment in the bottom shales of the Wufeng–Longmaxi Formation. Conversely, terrestrial input has produced a diluting effect to some extent; during the sedimentation period of the bottom shales in the Wufeng–Longmaxi Formation, the environmental conditions were characterized by dysoxic-anoxic and moderately stagnant settings, which were highly favorable for the accumulation and preservation of organic matter. However, due to a slightly more open water body environment during the deposition period at the base of the Longmaxi Formation compared to that of the Wufeng Formation, there exists a certain degree of difference in the controlling influence of the water body environment on the preservation of organic matter in the two sets of black shales from both formations. The organic matter enrichment in the two sets of shales from the Wufeng Formation and Longmaxi Formation exhibits distinct differences. The organic matter enrichment of the shale of the Wufeng Formation is controlled by productivity-retention environment, and the organic matter enrichment of the shale at the bottom of the Longmaxi Formation is controlled by conservation-open-upwelling ocean current.

Key words: organic matter enrichment mechanism, marine shale, Wufeng Formation–Longmaxi Formation, Upper Yangtze Platform, main controlling factor

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