摘要：

通过对塔里木盆地西缘露头、盆内钻井、测井和地震资料以及大量室内分析化验资料的层序地层综合分析，可将志留系划分成五个三级层序，志留系沉积层序厚度40--155m。层序界面多为分布范围较广的区域性或局部不整合。层序叠置样式可用具陆棚坡折的I型层序地层样式来描述。每个沉积层序可由完整的低位、海侵和高位体系域组成或由其中的一个、两个体系域组成。体系域边界主要依据滨岸上超点位置、岩性组合及准层序叠置样式变化来确定。低位体系域由向上粒度变细、砂岩厚度向上减薄的准层序组成；海侵体系域表现为向上泥岩厚度加大、砂岩厚度减薄的叠置特点；高位体系域表现为加积--进积沉积特征。志留纪，研究区接受了滨外陆棚及滨岸、海湾潮坪沉积，发育典型的海相沉积构造，表现出明显的旋回特征。

Abstract:

Integrated analysis of western margin outcrop, core and well-logging, seismic data and analytic data in Tarim Basin，five sequences with thickness of 40-155m have been identified in Silurian. Each sequence consists of either complete lowstand, transgressive and highstand systems  tracts or one or two of them. Pattern of Silurian in Tarim basin may be described by type I sequence model with shelf break. Sequence boundaries are mainly wide spreated regional or local unconformity; boundaries of systems tract are mainly decided on onlap location, lithologic association and variations of parasequence patterns. Lowstand systems tract consists of parasequences with fining in grain size and thinning in sandstone thickness upward; transgressive systems tract is characteristic of thinning in sandstone thickness and thicking of mudstone thickness upward; highstand systems tract is characterized by acceleration - progradation sedimentation. Sedimentary types of Silurian are mainly of shelf , offshore, and flat with typical marine sedimentary structures and cycles vertically.