地震沉积学在水下分流河道砂体预测中的应用

Application of seismic sedimentology to predicting underwater distributary channel sandbody

以萨中油田北一区断东高台子油层为例,开展密井网条件下基于地震沉积学的井震结合刻画方法研究,应用地层切片上的振幅特征和地震剖面上的波形变化特征,以＂地震趋势为引导,井点相确定＂为原则,平面与剖面相互验证,井震结合精细识别内前缘相水下分流河道砂体的空间展布特征。研究结果表明：研究区高台子油层水下分流河道宽度主要为60~150 m,只在中部发育500~600 m宽的大规模河道,为多期叠加而成,局部河道走向与物源方向垂直。

Taking Gaotaizi oil layer with block of Beiyiquduandong in Sazhong Oilfield as an example, the research of the accurate reservoir description method with seismic sedimentology was carried out. The underwater distributary channel of shallow-water delta front was finely identified by the characteristic of seismic waves in the strata slice and amplitude in the seismic section. The method can finely identify the spatially distributing feature of underwater distributary channel integrating high desity well-pattern with seismic data, which was guided by the distribution tendency of seismic amplitude, controlled by microfacies of wells, and the characteristics of plane and profile verified each other. The results show that the width of channel in Gaotaizi oil layer is 60-150 m, the middle area develops multi-channel overlaid by multi-phase with the width of 500-600 m, and the direction of several channels is perpendicular to provenance.