近海工程高分辨率地震探测静校正技术

Static corrections of offshore high-resolution seismic survey

静校正的好坏是直接影响地震资料叠加效果的关键因素之一。陆地地震勘探比较重视静校正问题 ,而海上地震勘探的静校正问题未引起足够的重视。实际上海浪引起的电缆起伏对地震记录所产生的时移 ,也是不能忽视的。本文以叠加能量最大准则和相关技术为基础 ,提出了一套对海上地震资料进行静校正的方法。理论模型试算表明 ,当浪高为 0 .3m时 ,就达不到近海工程高分辩率地震勘探的要求。为此 ,本文提出三种静校正方案 ,可以消除海浪的影响 ,此法是提高海上地震勘探分辨率的有效方法。

The quality of static corrections is one of key factors,which directly affects the stack results.Land seismic exploration pays more attention to static corrections,while offshore seismic survey does not.Actually,the relief of cable caused by sea resulted in time-shift in seismic records is not be neglected.Based on the criterion of maximum stack energy and correlation technique,the paper presented a set of static corrections aimed at offshore seismic data.The theoretical model test showed that the demand of offshore high-resolution seismic exploration can't be met when height of wave is greater than 0.3m.Therefore,the paper presented three static corrections methods that remove the influence of sea.The practice showed that the method is effective method for improving the resolution of offshore seismic exploration.