论文部分内容阅读
由陕西地矿局第八地质队承担的陕北侏罗纪煤田榆林—横山地区远景调查,始自1981年,于1985年5月结束全部野外工作,共施工钻孔45个,进尺34023.63m,控制面积1.3万 km~2,1∶10万路线地质调查4900km~2。本区含煤地层为侏罗系下统富县组(J_1 f)、中统延安组(J_2 y),以及三叠系上统瓦窑堡组(T_3 w)。其中以延安组的含煤性最好。本区具有一定规模的可采煤层有10层,延安组就有9层。Ⅲ号煤为主采煤层,呈简单层状、似层状产出,分布范围广,厚度变化小。在富县组顶部有一层可采煤层,可采煤累计厚度为0.91—15.77m,平均厚7.98m,含煤指数0.37—7.82%,平均3.54%。
The Yulin-Yokoyama Prospect Survey of the Jurassic Coalfield in Northern Shaanxi, undertaken by the Eighth Geological Team of Shaanxi Bureau of Geology and Mineral Resources, started all the field work in 1981 and ended in May 1985 with a total of 45 drilling holes of 34023.63m, Control area 13000 km ~ 2, 1: 110000 route geological survey 4900km ~ 2. The coal-bearing strata in this area are Jurassic Lower Fufu Formation (J_1f), Zhongyan Yan’an Formation (J_2y), and Triassic Upper Wayaobao Formation (T_3w). Yan’an group which contains the best coal. This area has a certain amount of recoverable coal seam has 10 layers, Yan’an Group has 9 layers. Ⅲ coal-based coal seam, was a simple layer, like stratified output, a wide range of distribution, small changes in thickness. At the top of Fuxian Formation, there is a layer of recoverable coal seam. The accumulative thickness of recoverable coal is 0.91-15.77m, with an average thickness of 7.98m and coal-bearing index of 0.37-7.82% with an average of 3.54%.