石油学报 ›› 2018, Vol. 39 ›› Issue (12): 1355-1369.DOI: 10.7623/syxb201812004

• 地质勘探 • 上一篇    下一篇

湖北鹤峰地区二叠系大隆组黑色岩系成因——来自鹤地1井的元素地球化学证据

王秀平1,2, 牟传龙1,2, 肖朝晖3, 郑斌嵩1,2, 陈尧3, 王启宇1,2, 刘惟庆1,2   

  1. 1. 国土资源部沉积盆地与油气资源重点实验室 四川成都 610081;
    2. 中国地质调查局成都地质调查中心 四川成都 610081;
    3. 湖北省页岩气开发有限公司 湖北武汉 430060
  • 收稿日期:2018-01-20 修回日期:2018-07-11 出版日期:2018-12-25 发布日期:2018-12-29
  • 通讯作者: 牟传龙,男,1965年1月生,1984年获成都地质学院地质矿产调查专业学士学位,1993年获成都理工学院沉积学专业博士学位,现为中国地质调查局成都地质调查中心研究员、博士生导师,主要从事沉积地质学及油气地质学研究。Email:cdmchuanlong@163.com
  • 作者简介:王秀平,女,1988年5月生,2010年获山东科技大学地质工程专业学士学位,2015年获山东科技大学矿产普查与勘探专业博士学位,现为中国地质调查局成都地质调查中心工程师,主要从事沉积和储层方面的研究。Email:wangxiuping198805@126.com
  • 基金资助:

    湖北省页岩气开发有限公司《鄂西地区重点层系页岩气评级及有利区优选》项目(HBYYQ-GC1075)资助。

Genesis of black rock series of Upper Permian Dalong Formation in Hefeng area, Hubei province: an evidence from the analysis of element geochemistry in Well HD1

Wang Xiuping1,2, Mou Chuanlong1,2, Xiao Zhaohui3, Zheng Binsong1,2, Chen Yao3, Wang Qiyu1,2, Liu Weiqing1,2   

  1. 1. Key Laboratory of Sedimentary Basins and Oil and Gas Resources, Ministry of Land and Resources, Sichuan Chengdu 610081, China;
    2. Chengdu Center, China Geological Survey, Sichuan Chengdu 610081, China;
    3. Hubei Shale Gas Development Company Limited, Hubei Wuhan 430060, China
  • Received:2018-01-20 Revised:2018-07-11 Online:2018-12-25 Published:2018-12-29

摘要:

为明确湖北鹤峰地区二叠系大隆组的沉积环境特征及黑色岩系的成因,开展了鹤地1井黑色岩系详细的元素地球化学分析。结果表明,大隆组缺氧的还原环境控制了有机质的富集,其早期沉积环境相对较稳定,为贫氧且富含H2S的还原环境,而中-晚期则呈明显波动变化的贫氧-缺氧环境。大隆组沉积期上升流的发育提供了大量的富营养物质,导致沉积水体缺氧,产生较高的古生产力。与同生断裂有关的热水上涌主要造成自生白云石和钠长石形成、硅质生物溶蚀再胶结作用,促使有机质发生热演化,对页岩气无不利影响。大隆组局部发育的层状硅质岩具有生物成因和自生化学沉淀成因2种类型。

关键词: 黑色岩系, 元素地球化学, 大隆组, 二叠系, 鹤峰地区

Abstract:

To identify the sedimentary environment characteristics and the genesis of black rocks in Upper Permian Dalong Formation, Hefeng area, Hubei province, the detailed element geochemistry of black rocks was analyzed in Well HD1. The results show that the reducing environment of Dalong Formation is the key control factor of organic matter enrichment. The early sedimentary was relatively stable as the reducing environment with lean oxygen and rich H2S, while the mid-late sedimentary presented the oxygen lean-oxygen deficit environment with significant fluctuations. In the sedimentary period of Dalong Formation, the upwelling development provided a lot of nutrient-rich materials, leading to the oxygen deficit environment in sedimentary water mass and the high paleo-productivity. The upwelling of thermal water along the contemporaneous faults had no adverse effect on the development of shale gas, which mainly caused the formation of authigenic dolomite and albite, the dissolution and re-cementation of siliceous organisms and the promotion of thermal evolution on organic matters. The layered silicalite locally developed in Dalong Formation are of two genetic types, i.e., biological genesis and authigenic chemical precipitation.

Key words: black rock series, element geochemistry, Dalong Formation, Permian, Hefeng area

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