济阳坳陷馆上段河道砂体地震识别方法——以孤南洼陷为例

Seismic identification method for Ng2 of Jiyang depression

济阳坳陷馆上段岩性油气藏隐蔽性强,直接的地震识别有因难。本文在研究孤南洼陷馆上段基本地质特征的基础上,总结了曲流河砂体的地震识别方法:运用地震相分析初步确定砂体发育区域;根据地震相干分析显值低、累计振幅值强的特点划分砂体有利区带和分布范围;在地震反演剖面上落实砂体位置;综合解释确定砂体几何形态。该方法已付诸实践,识别效果好。

A lithological reservoir of the upper of Ng2 in Jiyang depression is extremely subtle, the direct seismic identification is difficult. A seismic method for identifying meander river has been summed based on analyzing Guna sag upper Ng2 geology character. Sand body growth area has been determined by using seismic facies, benefit sand body belt and distribution range have been divided according to the low seismic facies analysis and strong added amplitude. Sand body position has been carried out in seismic inversion section and sand body geometry has been determined by synthesis interpretation. The method has been put into practice and identification effect is better.