双河油田核三段Ⅶ油组沉积微相研究

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

以岩心观察、粒度分析、沉积构造特征和测井相分析为基础,结合区域地质背景,建立双河油田核三段Ⅶ油组的沉积模式,认为该区为扇三角州沉积,主要发育水下分流河道、水下溢岸砂、河口坝、远砂坝和席状砂微相。在此基础上,通过横向对比,绘制了各单层的沉积微相平面展布图,详细阐述了沉积微相的展布特征和变化规律,为寻找剩余油提供了重要的地质依据。

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.