天然气地球科学 ›› 2020, Vol. 31 ›› Issue (1): 100109.doi: 10.11764/j.issn.1672-1926.2019.08.003
Jing-fei ZHANG1(),Ji-zhan ZHAO1,Dong-dong CHEN1,Shu-gang LI2,Hai-fei LIN2
摘要:
为了探讨含H2S煤层沉积环境特征,以彬长矿区小庄矿延安组4#煤层为研究对象,借助X?射线衍射仪、液晶库伦定硫仪、X?射线荧光光谱仪、等离子体质谱分析仪、稳定同位素质谱仪等实验仪器,从煤层显微组分、矿物组分、煤体孔隙及吸附特征、古盐度、沉积环境氧化还原性、水动力学表征指数、同位素特征及煤层热演化史等方面,对该区域煤层沉积环境特征进行了研究,并明确了煤层H2S的成因类型。研究结果表明:①研究区地质构造简单,井田中心带的南玉子向斜对H2S的富集有一定影响,且煤层顶底板岩性以泥岩为主,透气透水性差,对H2S富集起到封堵作用;②4#煤层富含有机质(植物化石)、碳酸盐矿物,地层古盐度Sr/Ba值较小(<0.5),沉积环境表征(U/Th值、Cu/Zn值以及还原性指数K)为厌氧—弱还原性,以上条件为该区域煤层H2S的生成提供了原料和环境基础;③煤层黄铁矿δ34S值(
中图分类号:
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