黔西北龙潭组煤系地层层序-沉积特征及聚煤规律研究

摘要

基于Vail提出的层序地层学理论,综合利用录井、岩心、测井等资料,并结合小波分析的方法划分了黔西龙潭组含煤地层的三级层序.与传统方法相比,小波变换具有定量划分地层层序的优势,避免了主观人为因素过多的弊端.最终,将黔西北龙潭组划分为4个三级层序、8个体系域.在对层序结构进行划分的基础上,对层序格架内的沉积相类型与特征进行分析,确定研究区主要的沉积相类型为三角洲相和泻湖-潮坪相.进而对层序格架下的煤层发育情况进行分析,三角洲平原最大海泛面附近和潮坪海侵体系域聚煤作用最强.%Based on the sequence theory of Vail,the third-order sequence stratigraphy framework of Longtan coal strata in northwestern Guizhou was established through analysing core data,logging data and using the wavelet transform technique.Comparing with the conventional methods that involve many subjective human factors,the wavelet transform technique has the advantage of dividing sequence stratigraphy quantitatively.Finally, Longtan Formation into 4 third-order sequences,8 tracts.Based on the division of sequence formation unit,the sedimentary facies and its distribution law in study area was discussed.This area mainly develops delta and lagoon-tidal flat. Proceed to the next step, the coal-accumulating characteristics in the sequence stratigraphic framework was dis-cussed.The thick coal seams are developed in the maximum flooding surface of delta plain environments and trans -gressive system tract of tidal flat.