乌尔逊凹陷南屯组湖底扇沉积特征研究

The Sedimentary Characteristics of the Lacustrine Fans of Nantun Formation in Wuerxun Sag,Hailaer Basin

通过岩芯观察和描述,结合地震、测井、粒度分析等方法,发现南屯组沉积时期乌尔逊凹陷中央带发育湖底扇沉积。从湖底扇相的根部至扇缘相带可进一步分为补给水道、内扇(主沟道、主沟道间)、中扇(辨状沟道、辨状沟道间和中扇前缘)和外扇(远源浊积岩)等4个亚相和6个微相,具有深水环境和沉积物重力流(碎屑流,颗粒流和浊流)搬运的特征。

According to the observation and description of core,well logs,seismic reflection feature and grain-size analysis data,the sublacutrine fans found in the center of the Wuerxun sag.From the root to the margin of the the sublacutrine fans,it can be successively dividede into four subfacies and six microfacies,feeder channel,iner fans（main channel,between main channel）,middle fans（braided channel,between braided channels and cetral microfacies）and outer fans（the turbidite rocks）.There are features of the deep sedimentary environment and the gravity flow（debris flow,grain flow and turbidite flow） transport of sediments.