准东煤田五彩湾矿区西山窑组层序地层学及聚煤规律分析

摘要

This paper discuss the sequence stratigraphy and coal-accumulating of Xishanyao Formation in Wuchaiwan prospecting area of Eastern Junggar coalfield, based on the discription of cores and the data of prospecting results,apply-ing the theories and the methods of the sequence stratigraphy,sedimentary,coal geology. Xishanyao Formation is dividied two third-grade sequences,and the system tracts and the parasequences were identified The lower sequence is the coal-bearing sequence,in which main workable coal seams were formed in the EST and HST,The formation of thick and huge thick coal seam attributed to the sustained banlance between the growth speed of the admitted space and the peat accumu-lating which produced by relatively slow subsidence of the basin basement and the relatively poor supply of clastic source.%以钻井岩心描述和勘探成果资料为基础，运用沉积学、煤田地质学和层序地层学相关理论和技术方法，对新疆准东煤田五彩湾矿区西山窑组含煤地层进行层序地层学及聚煤规律研究。将西山窑组划分为2个三级层序，确定层序内部体系域和准层序构成。下部层序为含煤层序，主要可采煤层发育于湖扩体系域和高位体系域，这些煤层合并形成巨厚煤层，最厚达80余米。厚及巨厚煤层的形成与该区西山窑组沉积相对慢的基底沉降速率和少的物源碎屑供给，及可容空间增加速率与泥炭沼泽的增长速率保持长时间的平衡有关。