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地质科学  2019, Vol. 54 Issue (3): 953-972    DOI: 10.12017/dzkx.2019.054
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皖南二叠纪海相暗色岩系成因及有机质富集模式
徐锦龙1    汪雅菲1    葛海影1    石永红2
  1. 安徽省地质调查院  合肥    230001;
  2. 合肥工业大学资源与环境工程学院  合肥 230009
Genesis and organic matter enrichment mode of the Permian marine black rock series in South Anhui Province
Xu Jinlong1    Wang Yafei1    Ge Haiying1    Shi Yonghong2
  1. Anhui Institute of Geological Survey, Hefei  230001;
  2. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei  230009
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摘要 
皖南二叠系已成为页岩气勘探的重要目标层位,暗色岩系的硅质来源长期存在争议,有机质富集堆积机理尚不清楚。本文通过皖南地区二叠纪海相栖霞组、孤峰组和大隆组暗色岩系的岩石学特征、古生物群落、沉积特征、有机质丰度和元素地球化学特征分析,探讨其沉积背景、硅质来源和有机质富集模式。研究表明:栖霞组硅质主要来源于热液;孤峰组硅质主要来源于生物和热液;大隆组硅质主要来源于生物和热液,少量来源于生物。二叠纪属热带—亚热带温暖潮湿气候,暗色岩系沉积于具缓慢沉积速率的厌氧—贫氧的100~300 m水体环境中,有机质含量高。栖霞组和孤峰组富有机质暗色岩系的形成除受控于局限滞留的缺氧环境外,还和海底热液活动提供生物繁盛的营养元素与矿物质和上升流的作用有较为密切的关系。大隆组富有机质暗色岩系的形成与长兴期多期火山喷发带入大量营养元素和微量元素,导致初级生产力提高,生物消亡—繁盛—再消亡—再繁盛—消亡,生烃母质快速堆积,且与缺氧环境密不可分。
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徐锦龙 汪雅菲 葛海影 石永红
关键词二叠纪   海相暗色岩系   有机质富集   海水缺氧   皖南     
Abstract
Permian in southern Anhui Province has become an important objective interval for shale gas exploration. Once a breakthrough is achieved, it will open a new window for oil and gas exploration in Anhui Province and even the Lower Yangtze region. However, the siliceous source of marine black rock series has been controversial for a long time, and the enrichment accumulation mechanism of organic matter is still unclear. Based on the petrological characteristics, paleontological communities, sedimentary characteristics, organic matter abundance and elemental geochemical characteristics of the Permian marine black rock series of Qixia, Gufeng and Dalong Formations in South Anhui Province, the sedimentary background, siliceous source and organic matter enrichment model are discussed. The results show that Qixia Formation is a typical hydrothermal siliceous rock, Gufeng Formation and Dalong Formation are biogenic-hydrothermal siliceous rocks, a few Dalong Formation is a typical biogenic siliceous rock with weak hydrothermal. Permian belongs to the warm and humid climate of tropical and subtropical zone. Black rock series are deposited in anaerobic-poor oxygen water environment with slow sedimentation rate. The organic matter content is abundance, and the sedimentary water body is generally 100~300 m. The formation of organic-rich black rock series in Qixia Formation and Gufeng Formation is not only controlled by limited-retention hypoxic environment, but also closely related to the role of organisms-blooming nutrient element and minerals and upwelling, which are provided by seafloor hydrothermal activities. The formation of organic-rich black rock series in Dalong Formation and the multi-stage volcanic eruption in Changxing Period brought in a large number of nutrient elements and trace elements, which led to the increase of primary productivity, benthos extinction-prosperity-re-extinction-re-prosperity-extinction, the rapid accumulation of hydrocarbon-generating parent materials and the inseparable relationship with hypoxia environment. In the Early Triassic, the climate was hot and dry, the volcanic activity was frequent, the ecosystem deteriorated rapidly, and the sea-water gradually turned into an oxidizing environment, which was not conducive to the enrichment and preservation of the living creature.
Key wordsPermian   Marine black rock series   Organic matter enrichment   Seawater hypoxia   South Anhui Province   
收稿日期: 2019-03-10; 出版日期: 2019-07-10
基金资助:

国家自然科学基金项目(编号:41641016)和中国地质调查局地质调查项目(编号:DD20190083,1212011120848)资助。

通讯作者: 石永红,男,1968年12月生,博士,教授,岩石学专业。本文通讯作者。     E-mail: yonghongshi3110@sohu.com
作者简介: 徐锦龙,男,1985年9月生,工程师,沉积学专业。E-mail:xujinlong0909@126.com
引用本文:   
徐锦龙 汪雅菲 葛海影 石永红. 2019, 皖南二叠纪海相暗色岩系成因及有机质富集模式. 地质科学, 54(3): 953-972.
Xu Jinlong Wang Yafei Ge Haiying Shi Yonghong. Genesis and organic matter enrichment mode of the Permian marine black rock series in South Anhui Province[J]. Chinese Journal of Geology, 2019, 54(3): 953-972.
 
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