木里煤田煤层聚积规律

Accumulation rule of a coal seam in Muli coalfield

从木里煤田区域构造演化特征、含煤盆地发展模式、煤系地层沉积体系的分析,初步总结了木里煤田的煤层聚积规律。本区主要含煤地层有两套,分别为下侏罗统大西沟组和中侏罗统窑街组,其中以中侏罗统窑街组最发育、最重要。从晚三叠世到早白垩世,整个煤田经历了印支期、燕山期多期性的构造活动,对含煤盆地的形成和发展起着控制作用。含煤地层形成过程中总的沉积环境或地貌景观为山间盆地型的开放式泄水湖泊环境类型。从古近纪以来,喜马拉雅期的构造运动,对含煤盆地起着破坏作用,对现今煤盆地中煤系地层的分布起着控制作用。从大地构造和地层分布情况来看,木里煤田中生代侏罗系坳陷带北部的冬库、默勒位于同一聚煤带上;中部弧山、阿仓河南、江仓矿区、热水矿区位于同一条聚煤带上;南部聚乎更、曲吓尼日位于同一条聚煤带。

After analysing the Muli coalfield regional tectonic evolution,carboniferous basin development model and coal-bearing strata sedimentary system,the accumulation rule of a coal seam in Muli coalfield has been summarized preliminargly.In this region,there are two sets of coal-bearing stratum,early Jurrasic Daxigou formation and middle Jurrasic Yaojie formation,and the latter is the most developed and important.From latter Triassic to early Cretaceous epoch,the whole coalfield experienced many tectonic activities including Indochina and Yanshan epoch and there activities controlled the formation and development of the coal-bearing basin.The common sedimentary environment or geomorphologic landscape during the coal seams formation process was of intermountain basin type and open-drain lake enviroment type.From Paleogene period on,the tectonic movement in Himalaya period has been breaking the coal-bearing basin and controlled the distribution of coal-bearing stratum.From the view of tectonics and distribution of the strata,the Dongku and Mole located in the north or Mesozoic Jurrasic depression zone should be on the same coal-forming belt,middle Hushan,Acang river south area,Jiangcang mining area and Reshui mining area should be on one same coal accumulation belt and southen Juhugeng and Quxianiri should be on one seme coal accumulation belt.