摘要：

在对柴达木盆地一里坪地区区域地质背景分析的基础上，根据录井岩屑描述、测井相分析和岩心观察，确定该区新近系发育冲积扇、河流—泛滥平原、扇三角洲、三角洲、湖泊等沉积相。应用录井和测井资料，编制出了地层厚度、砂岩含量、暗色泥岩含量、红色泥岩含量等值线图等基础图件。在此基础上编制出了上干柴沟组—狮子沟组4幅沉积相平面图。沉积相总体特征以滨浅湖沉积为主，而在研究区周缘则多发育河流泛滥平原、三角洲和扇三角洲沉积。这些图件动态地反映出沉积、沉降中心由西向东逐步迁移的过程。鸭参3井和落参1井区长期发育三角洲沉积，是研究区储集层发育最好的区块，也是下步勘探的重点地区。该研究对沉积相的精细研究具有一定的指导意义，对研究区的油气勘探也具有一定的参考意义。

Abstract:

On the basis of analyses of the regional geological background,through core observation and description and  logging data, alluvial fan， fluvial flood plain， fan delta， delta and lacustrine facies were identified in the Neogene in Yiliping area of Qaidam Basin, and isoline  maps of strata thickness, sandstone content, dark mudstone content and red color mudstone content were compiled.  Finally， distribution maps of sedimentary facies from the Shangganchaigou Formation to Shizigou Formation were drawn. The general sedimentary characteristics indicate that shoreshallow lacustrine deposits are the main types， while  flood plain， delta and fan delta occurred mainly along the basin margin. Moreover， these maps show that subsidence and depositional centres  shifted from west to east in the study area. Longexisted deltas in Well Yacan 3 and Luocan 1 areas became the best areas for reservoir development.  This study has an important reference significance for fine and detailed study of sedimentary facies and the exploration in Yi￣liping area.