新疆沙尔湖煤田煤层特征及对比

沙尔湖煤田含煤地层为中侏罗统西山窑组,根据岩性特征、含煤性以及其组合特征,将西山窑组分为上、中、下三段,可采煤层均分布在中段,煤层层数多,厚度变化较大,可采煤层6～27层,可采煤层总厚114.35～139.90m,根据各煤层之间的沉积间距及其与上、下岩层的旋回韵律,又将其划分为Ⅰ、Ⅱ、Ⅲ煤组。以大量地质资料为基础,总结了主要含煤层段的岩相组合特点,揭示了各煤层间的差异及组合特征,利用有效的对比方法,特别是数字测井在煤层对比中的应用,对可采煤层进行系统对比分析,对煤层对比的可靠性进行评价,保证了层位对比的正确可靠,并解决了勘查工作中终孔层位难以确定的问题,为正确划分煤系地层、准确估算煤炭资源量提供了可靠依据。

Discussion on Coal Seam Characteristics in Shaerhu Coalfield, Xinjiang

The coal-bearing strata in the Shaerhu coalfield belong to the middle Jurassic Xishanyao Formation,based on lithological features,coal-bearing properties and their combination characters,the formation can be divided into upper,middle and lower three members.Mineable coal seams are all in the Middle Member,multiple coal seams with larger variation of thickness,6～27 coal seams mineable,total thickness of mineable coal seams is 114.35～139.90m.According to interval between coal seams and strata cyclic rhythm,resolved into Ⅰ,Ⅱ and Ⅲ coal groups.Based on a mass of geological data,have summed up lithofacies assemblage characteristics of main coal-bearing sectors,revealed differences and assemblage characteristics between coal seams.Through approved correlation methods,especially the application of digital well logging in coal seam correlation,systematically correlated and analyzed mineable coal seams and assessed reliability of coal seam correlation.Thus assured correct and reliable horizons correlation,settled the hard issue of borehole ending horizon determination,provided reliable basis to divide coal measures strata and estimate coal resources correctly.