新疆伊犁盆地西山窑组沉积特征及聚煤规律  

Sedimentary characteristics and coal-accumulation patterns of Xishanyao Formation in Yili basin

作　　者：马帅[1] 田继军[1] 吴天伟[1] 柳磊[1] 付清波[1] 陈斌[1] 

机构地区：[1]新疆大学地质与勘查工程学院,新疆乌鲁木齐830047

出　　处：《煤田地质与勘探》2012年第2期9-14,共6页Coal Geology & Exploration

基　　金：新疆高校科研计划青年教师科研启动基金项目(XJEDU2009S01);新疆大学博士启动基金项目(BS090145)

摘　　要：水西沟群西山窑组是伊犁盆地主要含煤地层。通过对大量钻孔、测井、野外露头及古生物化石资料的分析,应用经典层序地层学基本理论和方法,对伊犁盆地水西沟群西山窑组进行层序地层分析,识别出SQ1和SQ2两个三级层序,并根据地层叠置样式、沉积旋回特征细分为5个体系域。通过分析沉积基础图件,恢复沉积环境,明确了本区西山窑组沉积演化特征:SQ1层序中主要发育河控三角洲,湖缘及泛滥平原区主要形成泥炭沼泽,且聚煤作用时间长,强度大,分布广,易于形成稳定的厚煤层;SQ2层序因后期构造运动影响,地层剥蚀程度较高,资料完整程度较低,沉积环境及聚煤规律尚待进一步研究。低位体系域煤层通常较高位体系域煤层分布广泛且稳定。对伊犁盆地西山窑组的沉积演化特征和聚煤规律的分析,为下一步煤炭勘探提供了依据。Xishanyao Formation is the main coal-bearing stratum in Yili basin. Based on the analyses of data about drilling, loggings, outcrops and palaeophytes, this paper studied the sequence stratigraphy of Xishanyao Formation in Yili basin. Two sequences, SQ1 and SQ2, were identified with the classic sequence stratigraphy method, and five system tracts were subdivided according to the superposition style of strata and sedimentation cycle. The charac- teristics of sedimentary evolution of Xishanyao Formation were also defined through analyzing the sedimentary environments. In sequence SQb a river-dominated delta was developed; a stable peat swamp was formed in the lake edge and flood plain area and stable thick coal seams were also formed after a long-time and wide-range intense coal accumulation. In sequence SQ2, owing to the tectonic transformation, the strong denudation and insufficient data, the coal accumulation and the sedimentary characteristics need to further study. The result provided the basis for further exploration of coal resources in Xishanyao Formation in Yili basin.

关 键 词：伊犁盆地 西山窑组 层序地层学 沉积特征 聚煤规律 

分 类 号：P618.11[天文地球—矿床学]