淮南煤田二叠系沉积相特征及其与烃源岩的关系

发布时间：2018-02-11 03:12

  本文关键词： 淮南煤田 泥页岩 微相 有机质 有利勘探区　出处：《煤田地质与勘探》2017年06期 　论文类型：期刊论文

【摘要】：在对淮南地区二叠系岩性、矿物和生物化石进行观测研究以及相关地球化学参数测试的基础上,对淮南地区这一时期的沉积相演化特征及其与烃源岩之间关系进行分析。结果表明:淮南地区早、中二叠世时期海水震荡性后退,总体以水下沉积为主,大致可划分为2种沉积亚相:山西组的三角洲沉积和下石盒子组的水下分流河道沉积,又可以进一步细分为前三角洲、泥炭沼泽、分流河道、决口扇、河漫滩等微相,泥页岩在前三角洲和河漫滩相最发育。岩性和显微组分的组成受沉积微环境变化的控制作用明显,"(腐泥组+壳质组)/∑显微组分"以大于等于70%为主,利于生气;有机碳含量则受沉积亚相和沉积微环境的共同控制,山西组泥页岩中有机碳平均质量分数约2.78%,明显高于下石盒子组泥页岩中的1.11%。综合考虑泥页岩累计厚度、有机碳含量及有机质的显微组成等因素认为,研究区山西组和下石盒子组都可作为页岩气的有利勘探层位,尤以"潘集镇 潘集区 泥河镇 平圩镇"这一带最为有利。
[Abstract]:Based on the observation and study of Permian lithology, minerals and biofossils in Huainan area and the measurement of related geochemical parameters, The evolution characteristics of sedimentary facies and the relationship between sedimentary facies and source rocks in Huainan area were analyzed. It can be divided into two types of sedimentary subfacies: the delta deposits of Shanxi formation and the underwater distributary channel deposits of the Lower Shihezi formation, and can be further subdivided into microfacies such as pre-delta, peat swamp, distributary channel, crevasse fan, floodplain, etc. Shale is the most developed facies in pre-delta and floodplain. The composition of lithology and maceral is obviously controlled by the change of sedimentary microenvironment. The content of organic carbon is controlled by sedimentary subfacies and sedimentary microenvironment. The average mass fraction of organic carbon in shale of Shanxi formation is about 2.78, which is obviously higher than 1.11 in shale of Lower Shihezi formation. The organic carbon content and the microstructure of organic matter show that Shanxi formation and Xiashihezi formation in the study area can be used as the favorable exploration horizon for shale gas, especially in the area of "Guannihe Town, Guanghing Wei Town, Panji Town, Panji Town".
【作者单位】： 安徽理工大学地球与环境学院;
【基金】：国家自然科学基金项目(41302129,41402140) 2013年度安徽省地质勘查基金第三批(续作)(2013-3-18) 安徽省自然科学基金项目(1408085QE88)~~
【分类号】：P534.46;P618.13

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