以高分辨率层序地层学原理为指导，通过野外露头剖面、岩心观察、钻井及测井曲线等资料分析， 将上干柴沟组划分为2 个长期基准面旋回和6 个中期基准面旋回，分析了2 个级别旋回的结构、叠加样式，在单井层序划分的基础上建立了上干柴沟组层序地层格架对比图。长期基准面旋回结构分布特点与地层之间存在较好的对应关系，位于湖盆中心、地层厚度大的地区主要发育C2型长期基准面旋回结构，而位于湖盆边部、地层相对较薄的地区主要发育C1型长期基准面旋回结构。最后以上干柴沟组层序地层等时对比格架为基础，编制了该区的岩相古地理图。

Based on high resolution sequence stratigraphy theory, and according to the analysis of description of field outcrop profiles, cores, well drilling and logging trace, the Neogene upper Ganchaigou Formation in west segment,northern margin of Qaidam Basin are divided into two long-term base level cycles and six medium-term base level cycles. The deposition structure and stacking patterns of this two levels cycle are analyzed. Sequence stratigraphic framework of upper Ganchaigou Formation is established based on the sequence division of single well. The distribution feature of long-term base level cycle sequence has better relation with stratum. The long-term base level cycle sequence type of C2 mainly developed in the central basin and thick stratum areas, and the type of C1 mainly developed in the margin of the basin and thin stratum areas. Based on the sequence stratigraphic isochronous correlation framework, the lithofacies and paleogeographymap of the study area have been drawn up.