沁水盆地东北部山西组砂岩特征与沉积环境研究

Sandstone Characteristics and Sedimentary Environment of Shanxi Formation in the Northeast of Qinshui Basin

针对沁水盆地东北部主要的含煤岩系山西组,在全面收集地质资料以及实地采样进行显微镜实验的基础上,从物质组成、结构和粒度特征两个方面对该区域砂岩的岩石学特征进行分析.研究结果表明该区域的山西组中砂岩的主要矿物成分为石英和长石,岩屑含量中等且杂基含量偏高,粒度以粗、中粒为主,分选和磨圆中等.该区域山西组沉积一系列5套主要砂岩体,共划分为三角洲、河流2种沉积相、6种沉积亚相和12种沉积微相,为进一步研究该区域含煤岩系提供了可靠的参考依据.

Aiming at the main coal bearing strata of Shanxi group in northeast part of Qinshui Basin,based on a comprehensive collection of geological data and field sampling microscope experiments,from the material composition,structure and size characteristics of the two aspects of petrology the regional characteristics of sandstone are analyzed. The results show that the main mineral composition of sandstone in Shanxi formation is quartz and feldspar,and the content of cuttings is medium and the content of hetero group is high. The grain size is mainly coarse and medium,and the sorting and grinding are medium. There are a total of five sets of main sand rock in Shanxi formation,it can be divided into 2 sedimentary facies： Delta and river,and can be further refined into 6 sedimentary surfaces and 12 sedimentary microfiches which provide a reliable reference for the further study of the coal bearing strata in this area.