新疆托克逊煤田侏罗系成煤环境及沉积特征分析  

Sedimentary Characteristics and Coal-accumulation Pattern of the Xishanyao Formation in the Toksun Coalfield of Xinjiang

作　　者：柳磊[1] 汪立今[1] 田继军[1] 吴天伟[1] 马帅[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：《地球学报》2011年第5期549-558,共10页Acta Geoscientica Sinica

基　　金：国家自然科学基金项目(编号:40862004;40862006);新疆高校科学研究重点项目(编号:XJEDV2007I09)联合资助

摘　　要：在对大量钻孔资料,测井资料、野外露头及古生物化石资料进行分析的基础上,应用层序地层学基本理论和方法,对托克逊煤田西山窑组进行了层序地层划分,共识别出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6个体系域。通过沉积基础图件、沉积环境的分析明确了研究区西山窑组沉积演化特征。SQ1层序中,河控三角洲发育,在湖缘及泛滥平原区形成稳定的泥炭沼泽,且聚煤作用时间长,强度大,分布广,形成了稳定的厚煤层;SQ2层序由于构造变动频繁,加上后期剥蚀严重,导致聚煤作用逐渐减弱。通过对托克逊煤田西山窑组的沉积环境特征和煤层聚集规律的分析为下一步的煤炭勘探提供了依据。Based on analyzing a mass of data concerning bore cores,loggings,outcrops and palaeophyte,the authors used the basic theory and method of classic sequence stratigraphy to divide the sequence stratigraphy of the Xishanyao Formation in the Toksun coalfield.As a result,two sequences of SQ1 and SQ2 were identified.Then,according to the style of stratigraphic superposition and cycles of sedimentation,the Xishanyao Formation was subdivided into six system tracts.Through the study of basic deposition maps and the analysis of sedimentary environment,the authors defined the characteristics of sedimentary evolution.For SQ1 sequence,rivers dominated delta development to form stable peat swamps on the lake edge and in flood plain areas,and the long and intense coal accumulation led to the formation of a stable thick coal seam.As for SQ2 sequence,due to frequent changes in structure and subsequent strong denudation,the coal accumulation was gradually weakened.The analysis of sedimentary characteristics and coal accumulation of the Xishanyao Formation in the Toksun coalfield has provided a basis for further coal exploration.

关 键 词：托克逊煤田 西山窑组 沉积特征 聚煤规律 

分 类 号：P618.11[天文地球—矿床学] P612[天文地球—地质学]