Study of Sedimentary Microfacies in VII Oil-bearing Layer of the Third Member of Shuanghe Oilfield

The sedimentary mode of Ⅶ oil-bearing layer of the third member of Shuanghe oilfield is established on the basis of core data,grain size analysis,sedimentary structural features and electrofacies analysis,combined with regional geologic background.It is held that there are fan delta sedimentary in the area,and the main sedimentary microfacies are subsea distributary channel,subsea overbank sand,mouth bar,distal bar and front sheet sand.Through horizontal correlation,the plane distribution of the sedimentary in every sublayer are drawed.The distribution and variation of these microfacies are elaborated,which is favorable to guide the finding of the remaining oil.