天然气地球科学 ›› 2023, Vol. 34 ›› Issue (2): 181193.doi: 10.11764/j.issn.1672-1926.2022.12.001
• 天然气地球化学 • 下一篇
张雷1,2(),赵培华2,侯伟1,2,李树新1,2,李星涛1,2,吴陈君3,张琴4(),肖玉峰4,刘雯4,刘丹4,封从军5,邱振4
Lei ZHANG1,2(),Peihua ZHAO2,Wei HOU1,2,Shuxin LI1,2,Xingtao LI1,2,Chenjun WU3,Qin ZHANG4(),Yufeng XIAO4,Wen LIU4,Dan LIU4,Congjun FENG5,Zhen QIU4
摘要:
鄂尔多斯盆地石炭系—二叠系海陆过渡相页岩气的研究主要集中在山西组山2段泥页岩,山23亚段是山2段泥页岩中有机质最为丰富的层段。对柳林县成家庄剖面进行实测并采集山23亚段泥页岩样品,并通过系统的有机碳含量、全岩矿物组成,主量、微量元素分析测试,对鄂尔多斯盆地东缘山西组山23亚段海陆过渡相泥页岩沉积期的古气候、水体环境、古生产力及与富有机质泥页岩发育关系进行了研究。结果表明:研究区山西组山23亚段泥页岩矿物组成中石英和黏土矿物占绝对优势,TOC平均值为2.04%,属于TOC较高的泥页岩;Sr、Sr/Ba、δ18O分析结果揭示山23亚段水体沉积环境经历了从下至上由咸水—半咸水—淡水的变化;Ceanom、Ni/Co、V/(V+Ni)判别表明山23亚段主体为贫氧—缺氧的水体环境;CaO/Al2O3*MgO、CIA指数表明山23亚段沉积时期气温由下至上逐渐降低,风化程度减弱;V/Ni、Mn/Ti及δ13C揭示山23亚段沉积期水体深度自下而上呈先增大再逐渐减小趋势;P/Al和生物Ba在山23亚段变化趋势一致,表现为从下至上先增大再减小。山23亚段泥页岩有机质的富集主要受水体氧化还原条件与陆源碎屑输入的影响。
中图分类号:
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