川南煤田古叙矿区含煤地层格架及聚煤作用

四川省古叙矿区晚二叠世龙潭组为一套海陆交替相含煤地层，根据勘查地质资料通过层序地层学和聚煤作用研究，根据区域性不整合面、河流下切谷充填砂岩底部冲刷面、石灰岩的旋回性及最大延伸范围等划分为2个三级层序及相应的低位、海侵及高位体系域。成煤的沉积体系主要为潮坪．三角洲体系，层序地层格架对煤层的发育、分布及含煤性具有明显的控制作用，厚度较大、展布范围较广的煤层主要分布在海侵体系域的中下部、高位体系域中下部及低位体系域的上部。层序I的含煤性最好，层序Ⅱ次之。

Upper Permian Coal-bearing Stratigraphic Framework and Coal-accumulation in the Guxu Coal Mine of the South Sichuan Coalfield

The Upper Permian Longtan Formation in the Guxu Coal Mine of the south Sichuan coalfield is a paralic coal-bearing formation. Study of sequence stratigraphy and coal-accumulation indicates that it may be divided into 2 third-order sequences and corresponding low stand system tract, transgressive system tract and high stand system tract. Coal-forming depositional system is a tidal fiat-delta system. The coal accumulation was controlled by sequence stratigraphic framework. Most of coal beds areconfined to the middle and lower of the transgressive system tract and high stand system tract as well as the upper of low stand system tract.