大城煤田含煤地层沉积环境分析

Dacheng coalfield sedimentary environment of coal bearing strata

大城煤田位于河北省中东部大城县境内,含煤地层时代为石炭～二叠纪,含煤岩系为一套海陆交互相的细碎屑岩,含煤32层,可采或局部可采煤层9层。中石炭世至早二叠世,沉积环境由浅海陆棚沉积演变成泻湖～潮坪沉积,再演变成三角洲沉积。有利于煤层发育的主要是泻湖、潮坪及三角洲环境的稳定时期,易形成稳定或较稳定的煤层。

Dacheng coalfield is located in the eastern part of Hebei province city county,coal bearing strata of Permo Carboniferous period time,coal bearing rock series is a set of paralic clastic rocks,containing 32 layers of coal,recoverable or local coal seam 9 layer. In the Carboniferous to early Permian,sedimentary environment from neritic deposit into the lagoon- tidal flat sedimentary,then turned into delta deposition. Is conducive to the development of coal seam is mainly the stability in the lagoon,tidal flat and delta environment,easy to form a stable or relatively stable coal seam.