淮南煤田石炭-二叠系泥页岩层系分布与沉积环境分析  

Permo-Carboniferous Argillutite Measures Distribution and Sedimentary Environment Analysis in Huainan Coalfield

作　　者：谢长仑[1] 胡宝林[2] 徐宏杰[2] 刘会虎[2] 程乔[2] 高德燚 郭鹏飞[2] 沈雨浩 

机构地区：[1]安徽省煤田地质局,安徽合肥230088 [2]安徽理工大学地球与环境学院,安徽淮南232001

出　　处：《中国煤炭地质》2015年第5期6-11,共6页Coal Geology of China

基　　金：国家自然科学基金项目(41402140;41302129);安徽省页岩气资源调查评价项目(2012-g-17);安徽省自然科学基金项目(1408085QE88)

摘　　要：基于钻孔岩心观察、室内试验测试以及结合前人研究成果,探讨了淮南煤田石炭-二叠系泥页岩层系分布特点及其沉积环境演化。结果表明:太原组、山西组和下石盒子组、上石盒子组均发育了不同厚度的泥页岩层系,泥岩岩石类型包括粉砂质泥岩、暗色泥岩和高岭石泥岩。太原组发育浅海相的碳酸盐岩和碎屑组成的含煤沉积,部分沼泽、湖泊相发育了泥岩;山西组为海退系列的水下三角洲平原沉积,下部厚约10m的暗色泥岩段有机质含量相对较高,为研究区内主要赋页岩气层段,上部为分流河道沉积,泥岩发育不稳定;下石盒子组与上石盒子组河流作用增强,沉积环境更靠近陆地一侧,不利于有机质的聚集,沉积泥岩有机质含量相对较低。山西组和下石盒子组为本区富有机质泥岩的富集层段,更具生气潜力。Based on borehole core observation, laboratory test and previous studied results, discussed Permo-Carboniferous argillite measures distribution features and Sedimentary environment evolution. The result has shown that in the Taiyuan, Shanxi, Xiashihezi and Shangshihezi formations have all developed argillite measures with different thicknesses; argillaceous rock types including silty mudstone, dark mudstone and kaolinitic mudstone. In Taiyuan Formation developed shallow sea facies carbonate rocks and clast formed coal-bearing deposits, part of swamp, lacustrine facies developed mudstone. Shanxi Formation is regressive series submerged delta plain deposits, lower part about 10m thick dark mudstone member has relatively high organic matter content, thus the main shale gas hosting sector in the study area;upper part is distributary channel deposits, unstably developed mudstone. Fluviation increased in Xiashihezi and Shangshihezi formations, sedimentary environment closer to land side, is adverse to accumulation of organic matters, thus relatively low organic matter content. Shanxi and Xiashihezi formations are organic matter enrichment sectors with more gas gener-ation potential.

关 键 词：泥页岩 层系分布 沉积环境 淮南煤田 

分 类 号：P534.4[天文地球—古生物学与地层学]