江汉盆地南部中古生界低信噪比地区静校正处理方法研究

The static methods in Mesozoic- Paleozoic low S/N area in the Southern Jianghan Basin

1. 长江大学地球物理与石油资源学院,湖北荆州 434102;2. 中国石化江汉油田分公司物探研究院,湖北潜江 433100;3. 中国石化南方勘探开发分公司勘探处,云南昆明 650200

School of Geophysics & Oil Resources, Yangtze U-niversity, Jingzhou 434102, China

针对江汉盆地南部平原海相中古生界地震资料的特点及存在的问题,分析了该区中古生界地层地震资料信嗓比低、成像困难的原因,认为静校正问题是制约该区地震资料处理效果的主要问题。比较了多种折射静校正方法的处理效果,发现交互迭代折射静校正的效果最好。在做好初至波的拾取、剩余静校正层位和时窗的选定、速度分析与最大能量自动剩余静校正迭代等处理工作的基础上,利用交互迭代折射静校正方法处理江汉盆地南部平原海相低信噪比资料,剖面品质得到了较大的提高,反射层次丰富,波组特征清晰,构造形态、断层等地质现象清楚。

This paper is based on the character of seismic data of Mesozoic and Paleozoic in Jianghan Basin, analyzes the character of the seismic data gathered, the problems in previous processing sections and the reason of lower rata of signal to noise. It presents that the key of improving the imaging quality of Mesozoic and Paleozoic seismic data is static methods and parameter also. Comparison some process system refraction static to field data shows that the effect of refraction static by interactive iteration is obviously in this area. It needs to carefully each processing, which includes in repeat tests of key parameters in picking up the first arrivals, horizon and time-window of residual static, repeat of velocity analysis and automatic residual correction etc. . The quality of section has improved.