焦作矿区深部煤层赋存及煤岩煤质特征

分析了焦作矿区构造特征和底层分布,说明焦作矿区属典型的华北石炭-二叠系含煤地层,内断层非常发育,多为北东向、近东西向和北西向的正断层。通过对矿区地质分层及目标煤层赋存情况的研究,说明焦作矿区主煤层山西组二1煤层厚度大,分布稳定,属结构简单型煤层;地层自上而下分别为第四系、第三系、上二叠统上石盒子组、下二叠统下石盒子组、山西组及上石炭统太原组。最后对二1煤层煤岩煤质特征进行了分析,结果表明:山西组二1煤属高变质程度无烟煤,宏观煤岩特征为灰黑色,似金属光泽,半暗型,以暗煤为主,亮煤次之,棕色条纹,质轻、污手,块煤为参差状断口,煤芯呈块状、粉状及颗粒状,粒径0.1～1.0 cm。

Occurrence features of deep coal seam and characteristics of coal petrography in Jiaozuo mining area

Analysis of structure features and coal seams distribution in Jiaozuo mining area indicates that the mining area is typical North China carboniferous-permian coal-bearing strata.The fault develops well and is mainly the normal fault whose direction is ne-trnding,nearly ew-trending and nw-trending.Anaysis of geological features and occurrence features of target coal seam show that the structure of Shanxi Formation Ⅱ1 coal seam is simple,this coal seam is thick and distributes stably.From top to down are Quaternary system,Tertiary system,upper permian higher Shihezi Formation,lower permian lower Shihezi Formation,Shanxi Formation and upper carboniferous series Taiyuan Formation.At last,analyze characteristics of coal petrography.The results show that Shanxi Formation Ⅱ1 coal is high metamorphic grade anthracite.From the macroscopic aspects,it appears in gray black,like metal luster,semi-bright,which shows that most are durain,then clarain.This low density coal also has brown fringe,when is touched,it is prone to get hands dirty.Fracture of lump coal is jaggy,while the coal core appears in massive,powdery and granular,whose particles size ranges from 0.1 centimeter to 1.0 centimeter.