济阳坳陷东部埕北地区Ng上段曲流河沉积相及砂体展布研究

Studies on Sedimentary Facies and Sand Body Extension in the Upper Ng Member of East Jiyan Downwarping Region

埕北地区Ｎｇ上段主要为曲流河沉积，储油砂体微基流河冲积平原亚相的曲流砂坝。由于它的单层薄，横向上变化大，分布复杂，直接影响到对它的勘探开发和储量。通过研究取芯井段的岩相，岩相组合，垂相沉积邓及各种电测井资料等，将Ｎｇ上段曲流河沉积砂体划分为三种亚相，并建立了曲流河沉积砂体的剖面结构和平面分布模式，进一步又以沉积小层和砂层组为单元研究了曲流河砂体的平面分布特征及纵向演化规律等。

The upper Ng meanber of Chenbei region is mainly characterized by its meander sediment whose microfacies of sand body filled with oil is point bar of fluvial plain subfacies. Its exploration, development and reserve estimation are directly affected by its single thin bed.great lateral variation and complex distribution etc. . Firstly, the upper Ng member meander sediment sand body has been divided into three subfacies by studying lithofacies and lithofacies association, vertical sedimendary sequences of cored interval and well logging data.Secondly, profile structure and horizontal distribution mode of meander sedimental sand body have been set up. Finally, the horizontal distribution characteristics and the vertical evolution law have been studied according to the single sedimentary beds and sand bedset > which being the reliable basis of fine reservoir description in the future.