四川盆地龙潭组与须家河组聚煤规律对比研究

以四川盆地上二叠统龙潭组和上三叠统须家河组含煤地层为研究对象,从沉积时期的构造演化过程、古地理展布和聚煤环境方面,对比分析其聚煤规律差异性。龙潭组时期盆地处于海陆过渡沉积环境,具有大地构造稳定、海平面升降平稳、潮坪-泻湖中泥炭沼泽广泛发育的特点。须家河组时期盆地为内陆湖泊盆地,周缘造山带活动剧烈,湖盆水体变化频繁,三角洲平原洼地中的泥炭沼泽发育受影响。龙潭组是四川盆地最主要的含煤地层。川东、川南地区在2个聚煤时代都处于有利聚煤环境,是四川盆地含煤地层的主要发育区域。

Contrast of Coal Accumulation Regulation of Longtan and Xujiahe Formation in Sichuan Basin

Contrasted and analyzed the differences of coal accumulating regulation of the coal bearing strata of upper permian Longtan formation and upper triassic Xujiahe formation in Sichuan basin,according to the tectonic evolution in sedimentary period,paleogeographic distribution and coal accumulation environment. In Longtan formation period,Sichuan basin is in sea-land transition sedimentary environment and it has stable tectonic and sea level. The peat bog in tidal flat and lagoon also developed extensively. In Xujiahe formation period,the Sichuan basin is an inland lake basin. The peripheral orogenic belts is severe.And the sea water changes frequently in the basin. The peat bog in delta plain is influenced by the above.So,Longtan formation is the best coal bearing strata. The east and south of Sichuan are in good accumulating environment in the two period,so they are the main development regions in Sichuan basin.