金乡县大代庙地区煤层地质特征及成煤环境分析

Geological Characteristics of Coal Strata and Analysis on Ore-forming Environment in Dadaimiao Area in Jinxiang County

摘要:

金乡县大代庙地区位于鲁西南平原区，地表被第四系覆盖，隐伏的石炭二叠系为区内主要含煤地层，该区含煤地层与单县煤田张集井田位于同一构造单元内，成煤地质条件良好。区内含煤地层为石炭二叠纪月门沟群的山西组和太原组，煤层共计8层，总厚度5.57m。其中可采煤层为山西组3上煤层和太原组14下煤层，煤层倾角3°～12°左右，区内东部煤层倾角稍缓，西部倾角相对较陡，煤层埋深在1140～1940m左右。3上煤层为该区最主要的可采煤层，煤层结构简单，煤质好，煤类为焦煤（JM25），属强黏结煤；14下煤层为可采煤层，煤质较好，煤类为焦煤（JM25），属特强黏结煤。

Abstract:

Dadaimiao area in Jinxiang county is located in the southwest plain of Shandong province, and the surface is covered by Quaternary. Hidden Carboniferous and Permian system are main coal-bearing strata. The coal-bearing strata in this area are located in the same structural unit as Zhangji minefield of Shanxian coalfield with good coal-forming geological conditions. The coal-bearing strata in the area are Shanxi formation and Taiyuan formation of Carboniferous and Permian Yuemengou group. There are 8 coal strata in total. The total thickness of coal strata is 5.57m. The mineable coal strata are the upper part of No.3 coal stratum of Shanxi formation and the lower part of No.14 coal stratum of Taiyuan formation. The dip angle is about 3°～12 ° . The dip angle of coal strata in the east part is slightly slow, while it is relatively steep in the west part. The coal strata depth is about 1140～1940m. The upper part of No.3 coal stratum is main minable stratum in the area. The coal structure is simple, and the coal quality is good. The coal type is coking coal (JM25) , which is a strong baking coa. The lower part of No.14 coal stratum of Taiyuan formation is mineable coal with good coal quality. The coal type is coking coal (JM25) , and belongs to extra-strong baking coal.