多方法联合识别河道技术在南八仙地区的应用

Identification of channels by multi-attributes in Nanbaxian

本文以柴达木盆地北缘南八仙构造北斜坡为研究对象,在充分了解目标区地质和地球物理特征的基础上,采用地震属性、谱分解、Sobel相干、能量比相干和普通相干及可视化等系列技术,对该区N21层河道砂体分布规律进行研究,同时对各种方法的特点和效果进行了分析和对比。研究结果表明,仙北斜波河道砂体发育,并沿东南向西北方向展布,是该区的岩性圈闭远景区。

This paper focuses on identification of channels by multi-attributes in the north slope of Nanbaxian,north part of Qaidam Basin.After studying geological and geophysical features of the area,we use seismic attributes,spectral decomposition,Sobel filter similarity,energy ratio similarity,coherence and 3-D visualization to identify the distribution of channel sand bodies in N12.Meanwhile we analyze features and results by different approaches.The results show that channel sand bodies in the north slope of Nanbaxian were developed,and that they distribute from southeast to northwest.The area may be prospective with lithologic traps.