一、大地构造研究在煤田地质工作中的意义和作用如所周知,普查找煤的地质依据,一般说来,有四个方面,(一)成煤时代不论从世界范围或是从我国全国来看,在地史中有四个主要成煤期,即石炭纪、二迭纪、三迭一侏罗纪和第三纪。在我国境内,举其主要的来说,晚石炭一早二迭世煤系广泛分布于北部;晚二迭世煤系普遍分布于南部。晚三迭一早侏罗世煤系呈小片状散布在华南各地;早、中侏罗世煤系主要散布在华北及西北(天山、祁连山等处)。晚侏罗 First, the significance of geotectonic research in coalfield geological work and its role As we all know, general geological survey of coal, in general, there are four aspects, (a) the coal age, whether from the world or from all over the country to come Look, in the history of the earth has four major coal-forming period, namely Carboniferous, Permian, Triassic-Jurassic and Tertiary. In our country, for the most part, Late Carboniferous-Early Permian coal systems were widely distributed in the north; late-second-generation coal-bed methane systems were generally distributed in the south. The Late Triassic-Early Jurassic coal system was scattered in all parts of South China. Early and Middle Jurassic coal measures were mainly distributed in North China and Northwest China (Tianshan and Qilian Mountains, etc.). Late Jurassic