根据野外露头剖面和岩心观察，钻井、录井及测井曲线等资料,研究了柴北缘西段古近系下干柴沟组沉积相类型和沉积特征。结果表明，下干柴沟组发育冲积扇、扇三角洲、辫状河、辫状河三角洲和湖泊5种沉积相。在鄂博梁—冷湖潜西地区发育了一套冲积扇—扇三角洲—湖泊沉积体系，马海—南八仙地区发育冲积扇—辫状河—辫状河三角洲—湖泊沉积体系。相应地建立了下干柴沟组沉积相模式。由此更加清楚地展示了下干柴沟组沉积相分布规律，为下一步的油气勘探工作提供可靠的地质资料。

Based on description of field outcrop profiles and cores, well drilling and logging and so on, the types of the sedimentary facies and their characteristics of Paleogene Lower Ganchaigou Formation were studied. The research shows that alluvial fan, fan delta, braid river, braided delta and lacustrine facies were present in the formation. There is a set of fan, fan delta, lacustrine facies depositional system in the Eboliang\|Lenghu\|Qianxi area, and a set of fan, braid river, braided delta, lacustrine facies depositional system in the Mahai\|Nanbaxiang area. The sedimentary facies model was established of Low\|Ganchaigou Formation. It demonstrates the sedimentary facies distribution more clearly, providing the reliable geological information for the next exploration activity.