淮南煤田山西组泥页岩微量元素地球化学特征及其意义

发布时间：2018-01-24 04:40

  本文关键词： 淮南煤田 微量元素 地球化学特征 泥页岩　出处：《煤田地质与勘探》2017年02期 　论文类型：期刊论文

【摘要】：泥页岩中微量元素特征对反演泥页岩形成时的沉积和古地理气候条件具有重要意义。采集淮南煤田山西组泥页岩样品,利用ICP-MS对泥页岩中微量元素进行了测试分析,探讨了研究区山西组泥页岩中微量元素的地球化学特征及其意义。结果表明,B、Cr、U、Ga、Li、Sn、Pb、Mo、Th、W等元素富集,Cd、Co、Cu、Ti、Zn、Sc、Ba、Mn、Ni、Sr等元素亏损;揭示淮南煤田山西组形成于温暖湿润和半咸水 高咸水的沉积环境中,沉积体系为开放型,体系内为弱氧化 还原环境,其中以弱还原 还原环境为主,且表现出从早期弱氧化到中后期的还原环境的演化特征;依据U/Th、Ni/Co、Sr/Cu、B/Ga、Sr/Ba、TOC等地球化学参数结果推测,盐度和氧化还原条件受到多种因素的影响,有机质的原始堆积量是影响山西组泥页岩中有机质含量的主要因素,而盐度和氧化还原条件影响有机质中各显微组分含量。研究区温暖湿润的气候和较为还原的环境为有机质的堆积和保存提供了有利条件,为页岩气的成藏提供了物质基础。
[Abstract]:The characteristics of trace elements in shale play an important role in inversion of sedimentary and paleogeographic climatic conditions during shale formation. The shale samples of Shanxi formation in Huainan coalfield are collected. The trace elements in shale are tested and analyzed by ICP-MS, and the geochemical characteristics and significance of trace elements in shales of Shanxi formation in the study area are discussed. Elements such as Li Sn, Pb, Mo, Th, W and so on are enriched with the depletion of elements such as CD, Co, Cu, Ti, Zn, Zn, S, S, B, mn, M, N, F, Sr, and so on. It is revealed that the Shanxi formation of Huainan coalfield was formed in the sedimentary environment of warm and humid and brackish water with high salt water. The sedimentary system is open and the environment of weak redox is the main one. It also shows the evolutional characteristics of reduction environment from early weak oxidation to middle and late stage. According to the geochemical parameters such as U / T / Ni / Ni / Ni / Cu / Cu / Cu / Ga, Sr / Ba / TOC, it is inferred that the salinity and redox conditions are affected by many factors. The original accumulation of organic matter is the main factor affecting the content of organic matter in shales of Shanxi formation. The salinity and redox conditions affect the maceral content of organic matter. The warm and humid climate and relatively reduced environment in the study area provide favorable conditions for the accumulation and preservation of organic matter. It provides material basis for shale gas accumulation.
【作者单位】： 安徽理工大学地球与环境学院;福建省煤田地质勘查院;
【基金】：国家自然科学基金项目(41302129) 安徽省自然科学基金项目(1408085QE88) 山西省煤层气联合研究基金项目(2012012008)~~
【分类号】：P618.11
【正文快照】： 引用格式:高德q，

本文编号：1459197