摘要
依据岩性组合特征对清水营井田延安组含煤地层进行了层段划分,并对各层段的沉积环境进行了分析,认为延安组沉积环境是以河流作用为主的湖泊三角洲相,其形成经历了冲积平原、浅湖三角洲又复向冲积平原过渡的充填演化过程,每一充填阶段均具有明显的周期性变化,这种充填形式决定了本区中侏罗世的聚煤特点,聚煤作用主要发生于废弃的三角洲平原之上,并形成区内具有工业价值的主要煤层。
Based on lithologic association features divided the Yanan Formation coal-bearing strata in the Qingshuiying minefield into members and analyzed sedimentary environment in each member, considered that sedimentary environment of Yanan Formation was mainly fluviative lacustrine delta facies. The formation of the facies experienced infilling and evolution process from alluvial plain to shallow lacustrine delta and returned to alluvial plain again. Every infilling stage had obvious periodicity, thus ruled out Middle Jurassic Epoch coal-accumulation features in the area. Coal-accumulation was mainly happened on the abandoned deltaic plain and formed commercial main coal seams in the area.
出处
《中国煤炭地质》
2009年第11期16-18,45,共4页
Coal Geology of China
关键词
清水营井田
延安组
含煤地层
沉积环境
聚煤作用
Qingshuiying minefield
Yanan Formation
coal-bearing strata
sedimentary environment
coal-accumulation
