摘要
基于反射波的静校正技术,通常是在反射波CMP叠加剖面上,选择波组连续性好,信噪比高的反射层作为参考层制作模型道,然后再利用互相关的方法求取炮点和接收点的静校正量。当反射波的信噪比过低时,常规的剩余静校正方法由于不能建立准确的模型道而失效。折射静校正采用信噪比较高的初至波进行静校正计算,效果稳定。初至是否平滑,往往作为静校正效果的一个判断准则。这里基于短波长静校正量的随机性和初至与反射波时差变化的一致性二个假定条件,提出了拟合初至利用误差分配的方法,进行静校正量的求取。通过对实际资料静校正处理前、后对比,验证了该算法的正确性和适应性。
The static correction technique based on reflected wave is usually to choose a continuous-wave group of reflected wave in the CMP stack section,and the reflective layer of high signal to noise ratio as a reference layer modeling data,and then use cross-correlation method to compute the static correction values of the shot and receiver point.When signal to noise ratio is too low,the conventional residual static correction method will fail because it is difficult to build an accurate model.Refraction static correction can get good results by using high signal to noise ratio of the first arrival to do static correction calculation.The main criteria is whether the first arrival smooth enough.Based on the random volume of short-wavelength static correction and the first arrival difference and the consistency of reflected wave changes,it is proposed to make use of error of fitting the distribution of the above mentioned methods to compute the static correction values.The use of this algorithm in many areas dealing with the static correction achieved satisfactory results.
出处
《物探化探计算技术》
CAS
CSCD
2010年第3期241-246,219-220,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家教育部博士点基金(200806160015)
关键词
初至波
拟合
平滑
误差分配
first arrival
fitting
smoothing
error distribution
