摘要
马家滩矿区主要含煤地层为侏罗系中统延安组(J2y),含煤30余层,根据矿区岩性特点、成因标志、标志层、煤层特征、相序组合、物性特征等因素,将延安组地层自下而上划分为5个中旋回,每个中旋回又根据湖水的进退,三角洲的伸缩等特点可细分为16个次一级的亚旋回;延安组聚煤作用是在三叠系起伏不平的基底之上发展起来的,其沉积环境主要为三角洲之上的冲积平原,浅湖—滨湖—沼泽—三角洲—浅湖—滨湖—沼泽相继更迭而形成区内各个煤层。
The main coal-bearing strata in the Majiatan mine area belong to the Yanan Formation, Middle Series, Jurassic System （J2y）, contain 30 more coal seams. Based on factors of lithologic features, genetic indices, marker beds, coal seam characteristics, facies associations and physical properties divided the Yanan Formation from bottom to top into 5 medium cycles, then based on lacustrine transgression and regression, deltaic spread and shrinkage subdivided medium cycles into 16 secondary subeycles. Coal accumulation of Yanan Formation was developed on the Triassic System rolling basement, sedimentary environments were mainly alluvial plain-shallow lake-lakeshore-swamp-delta-shallow lake-lakeshore-swamp on the delta alternated in succession and formed coal seams in the area.
出处
《中国煤炭地质》
2009年第11期19-21,27,共4页
Coal Geology of China
关键词
宁东煤田
马家滩矿区
沉积环境
聚煤规律
Ningdong coalfield
Majiatan mine area
sedimentary environment
coal accumulation pattern
