河南省永城煤田山西组及下石盒子组聚煤特征

应用沉积学和煤田地质学理论，分析了永城煤田上二叠统山西组和下石盒子组的沉积环境及聚煤特征．山西组下部地层的沉积环境为潮坪，上部及下石盒子组是三角洲体系的产物．煤层的形成、赋存、厚度变化、分布均受沉积环境的控制和影响，主可采煤层二，煤是在潮坪基础上发展起来的泥炭坪形成的，厚度与下伏砂体呈负相关关系；下石盒子组中的各煤层分别形成于三角洲建设阶段及废弃阶段的泥炭沼泽中．

Study on coal- accumulating characteristic of Shanxi formation and low Shihezi formation in Yongcheng Coalfield,Henan province

Based on the theory of sedimentology and coal field geology,a systematic analysis is carried out on the sedimentary environment and coal accumulating characteristics of the lower Permian Shanxi and Lower Shihezi Formation in Yongcheng Coalfield of Henan province.The research shows that the sedimentary environment of the lower stratum of Shanxi formation is considered as the tidal flat,and the upper stratum and the Lower Shihezi formation is the result of delta systems.The occurrence,hosting,thickness and distribution of the coal seams are controlled by depositional environment.The major minable coal seam Shan22 formed in peat flat of tidal flat,and its thickness is negatively correlated with the underlying sand;the coal seams of Lower Shihezi formation formed respectively in the peat swamp of construction stage and abandonment stage of delta plain.