天然气地球科学 ›› 2020, Vol. 31 ›› Issue (1): 110121.doi: 10.11764/j.issn.1672-1926.2019.06.008
Qiu ZHONG1(),Xue-hai FU1(),Miao ZHANG1,Qing-hui ZHANG2,Wei-ping CHENG3
摘要:
通过对采集自沁水煤田27口钻孔695块山西组—太原组泥页岩岩心样品开展总有机碳含量(TOC)、岩石热解、有机质成熟度和全岩X?射线衍射等实验,分析了煤系泥页岩的有机地球化学及矿物组成特征。结果表明:海陆交互相煤系泥页岩TOC平均值大于2.0%,中—好等烃源岩主要集中在第Ⅱ层段;泥页岩以III型干酪根为主,热演化程度主要处于过成熟阶段,转化率程度高;沁水煤田泥页岩主要为黏土质泥页岩,矿物组成以高黏土、低硅质矿物为特征,黏土矿物中高岭石富集;基于矿物组成法计算泥页岩脆性指数主要分布在30%~50%之间,平均大于40%,脆性指数Ⅱ>III>Ⅳ>Ⅰ(第I层段为K8—3#煤,第II层段为3#煤—K4灰岩,第III层段为K4灰岩—15#煤,第IV层段为15#煤—铁铝岩段);气测异常层、含气层和气层厚度比例分别为4.78%、33.38%、61.83%,气测显示以气层为主,气测显示级别II>III>IV>I。综合煤系泥页岩厚度、有机质丰度、脆性特征和含气性特征等评价了各层段页岩气的勘探开发潜力有利顺序依次为II>III>IV>I。
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