Sedimentation feature and controlling factors of the deep glutenite fans in the northern steep slope.Dongying sag——taking Well Fengshen-1 area as an example

By finely observing and describing the drilling cores from Well Fengshen 1 and Well Feng 8 in the steep slope of Dongying Sag,and integrating the analysis of seismic data, it is revealed that the glutenite fans of different geologic ep- ochs were deposited in Well Fengshen 1 area with main types as alluvial fan,fan delta and inshore underwater fan.These glutenite fans underwent the rifting of the Sag,enveloped in the dark mudstone,and the lithology is dominated by the badly-sorted coarse fragments.Comprehensive study sug- gests that the fans are characterized by the gravity flow.On the seismic sections,the glutenite fans were emerged as a u- nique polyphase superposing sedimentation.It is the tectonic activities,hydrodynamic condition and other controlling fac- tors that bring about the unique reflectance signature.