柠条塔煤矿富油煤赋存特征及其成煤环境控制

Occurrence Characteristics and Coal-forming Environment Control of Oil-rich Coal in Ningtiaota Coal Mine

为查明柠条塔煤矿富油煤煤岩煤质变化特征、成煤环境,通过收集整理的煤岩特征、工业分析、元素分析等数据,统计分析镜惰比、形态硫分布、灰成分指数、三角端元图及干酪根类型等参数,探讨各煤层参数变化及成煤环境。结果表明:各煤层焦油产率平均值7.5%~11.5%,以富油煤为主,煤岩组分中惰质组含量较高,镜惰比为0.65~1.62,煤系剖面上呈低-高-低变化特征,与焦油产率、硫分均呈正相关关系;灰分及灰成分指数显示成煤沼泽接近陆源区,覆水程度较浅,2^(-2)、3^(-1)和4^(-2)煤偏向于覆水较深的还原性环境;活性组分(镜质组+壳质组)、挥发分及氢含量较高的煤层,焦油产率也高,惰质组含量高则相反;各煤层煤化程度相当于石油开始形成阶段。

To find out the coal quality change characteristics and coal forming environment of oil-rich coal in Ningtiaota coal mine,through the collection and collation of exploration and production data,according to the coal and rock characteristics,industrial analysis,element analysis and other data,the parameters such as mirror inert ratio,morphological sulfur distribution,ash composition index,triangular endmember diagram and kerogen type are statistically analyzed,and the parameters change and coal forming environment of each coal seam are discussed.The results show that the average tar yield of each coal seam is between 7.5%and 11.5%,which is mainly oil-rich coal.The content of inertinite in coal and rock components is high,and the mirror inert ratio changes from 0.65 to 1.62.The coal profile shows low-high-low variation characteristics,which is positively correlated with tar yield and sulfur content.Ash content and ash composition index show that the coal-forming swamp is close to the land source area and the degree of rewatering is shallow.2^(-2),3^(-1)and 4^(-2)coals tend to rewater deeper in the reductive environment.The coal seam with higher active components(vitrinite+exinite),volatiles and hydrogen content has higher tar yield,while the coal seam with higher inertinite content has the opposite.The degree of coalification of each coal seam is equivalent to the beginning of oil formation stage.