【摘要】 水城矿区二塘向斜二叠系晚期龙潭煤组上段应与大河边向斜一样属于宣威煤组上段(即为长兴煤组和龙潭煤组上段),是该地区的主要含煤层段。文中将该段的沉积划分为一种沉积体系,二个沉积相区,5种沉积类型。重点分析了三角州体系沉积区的聚煤条件。在上三角州平原及上下三角州过渡带区,煤层大都形成于泛滥平原相的沉积基底上。更多还原

【Abstract】 The late Permian Longtan coal group of Ertang syncline is the main coal-bearing coal seam segments,which belongs to the upper Xuanwei coal group(i.e.upper Changxing and Longtan coal group).This article divided this sedimentary segment into one sedimentary system,two facies and 5 sedimentary types.The coal-concentrating condition of the Delta sedimentary area was analyzed.The coal seams mostly formed on the sedimentary base with flood plain face in the transition areas of upper and lower delta plain.更多还原