焦作地区含煤岩系沉积环境与聚煤特征

SEDIMENTARY ENVIRONMENT OF THE COAL MEASURE AND THE COAL-BEARING FORMATION, JIAOZUO, HENAN PROVINCE

焦作地区含煤地层为太原组和山西组。太原组由潮下浅海、障壁岛、泻湖、潮坪等沉积环境组成,并发育风暴沉积的灰岩和砂岩。Ⅰ_2煤和Ⅰ_5煤是本组的主要煤层,系形成于广阔的潮坪泥炭沼泽环境。山西组由潮坪、海滩脊和三角洲平原等沉积环境组成,Ⅱ_1煤层是本组的主要煤层,厚度大、分布广、煤质低硫中灰。煤层厚度变化主要受沉积环境的制约和影响。

The coal-bearing formations are of the carboniferous Taiyuan Group and Shanxi Formation in Jiaozuo area.The Taiyuan Group is represented by subtidal shallowsea, barrier island, lagoon,tidal flat etc.sedimentary environments,Where developed limestones and sandstones of storm deposit.The I2 and I5 coal beds are the main coal beds in this group. They were formed in peat swamps located on wide tidal flat.the Shanxi formation is represented by tidal flat, seabeach ridge aad delta plain etc .sedimentary environments.The Ⅱ1 coal-seam is the main coal seam in this Formation.It is characterized by its wide distribution,great thickness, low sulphur and medium ash content.Its thicknes reflected the chief chracter of the sedimentary emivonment.