东胜煤田含煤岩系层序地层特征与聚煤规律分析——以东胜煤田阿不亥煤炭勘查区为例

Coal-bearing Strata Sequence Stratigraphic Features and Coal Accumulation Pattern Analysis in Dongsheng Coalfield——A Case Study of Abuhai Exploration Area in Dongsheng Coalfield

研究区含煤岩系主要为侏罗系中统延安组,通过煤岩层研究和对比,认为延安组本身为一个完整的层序,可分为三个体系域、五个小层序组和18个小层序;体系域、小层序组和小层序之间的转换面是聚煤的主要层位。含煤地层可编号18层煤,其中可采煤层15层,根据层序地层分析和含煤岩系沉积特点,将含煤地层分为三个岩性段,5个煤组,相对应三个聚煤期和5个成因单元。该区的聚煤作用主要受到沉积环境、古地形和古构造的控制。

The coal-bearing strata in the study area belong to the Yanan Formation of Middle Jurassic Series.Based on coal and rock study and correlation,considered that Yanan Formation itself is an integrated sequence contains 3 systems tracts,5 parasequence sets and 18 parasequences;the transitional surfaces between systems tracts,parasequence sets and parasequences are main horizons of coal accumulation.There are 18 numbered coal seams,in which 15 mineable.Coal-bearing strata can be divided into 3 lithologic sectors,5 coal groups corresponding to 3 coal accumulation stages and 5 genetic units.Coal accumulation in the area is mainly controlled by sedimentary environment,paleotopography and paleostructure.