东海陆架盆地西部凹陷带长江凹陷含煤层系分布特征分析与预测

通过对同处东海陆架盆地西部凹陷群的长江凹陷、瓯江凹陷以及处于陆架盆地东部凹陷群但与长江凹陷相连通的西湖凹陷3凹陷在构造背景、形成演化、构造特征、地层分布与沉积环境变迁等方面的综合对比分析认为,长江凹陷古新统美人峰组中上部、始新统长江组中上部应分别具有与瓯江凹陷古新统中上部的明月峰组、西湖凹陷始新统中上部的平湖组相似的含煤层系分布,渐新统以上地层不存在或仅有部分煤线分布；与西湖凹陷相连通的南部大观园深凹内部广泛发育的连接浙闽隆起和翠秀堂低凸的构造斜坡带是含煤层系分布的最有利区域.

Analysis and Forecast of Coal-Bearing Strata Distribution in Yangtze Depression in Western Depression Belt,East China Sea Shelf Basin

This paper is based on the comparison of tectonic background,formation and evolution,structural features,stratum distribution and sedimentary environment evolution of Yangtze Depression and Oujiang Depression,which are in the western depression belt,and West Lake Depression which is in the eastern depression belt and interconnected with Yangtze Depression.Through systematic and comprehensive analysis,this paper predicts that in Yangtze Depression there should be coal-bearing strata distributed in mid-upper Meirenfeng Formation of Paleocene which is analogous to the coal-seams distribution in Mingyuefeng Formation of Mid-Upper Paleocene in Oujiang Depression,and in mid-upper Yangtze Formation of Eocene which is analogous to the coal-seams distribution in Pinghu Formation of mid-upper Eocene in West Lake Depression.There are no or few coal pipes distributed in strata above the Oligocene.The extensive slope belt which connected with the Zhejiang and Fujian folded doming-up region and the Cuixiutang low upheaval,and developed in Daguanyuan deep depression of south Yangtze Depression should be the most favorable area for coal-bearing strata distribution.