基于积分中值参变量法的质心频移Q值估算

A centroid frequency shift method of Q estimation based on mean value theorem of integrals

同济大学海洋与地球科学学院,上海200092

Zhang Libin,School of Ocean and Earth Science,Tongji University,Shanghai 200092,China

常规频移Q值估算方法通常具体假定震源子波振幅谱展布形态,因此限制了方法的适用性及Q值估算结果的准确性。为了拓展频移法的适用范围,不对震源子波振幅谱展布做具体前提假定,由质心频率定义出发,基于积分中值定理及回归分析原理,提出了基于积分中值参变量法的质心频移Q值估算方法。通过引入双向逼近正Q扫描策略,进一步提高了积分中值参变量法的计算稳定性及准确性。数值模拟和实验分析证实了该方法的正确性及准确性。

Traditional frequency shift methods of Q estimation always assume the shape of amplitude spectrum of source wavelet,which confined the accuracy and practicability of these methods.In order to expand the applicability of frequency shift methods,starting from the definition of centroid frequency,based on mean value theorem of integrals and regressive analysis,a centroid frequency shift method of Q estimation without assumption on the shape of source wavelet has been presented.Furthermore,two-way approximating forward Q scanning strategy was introduced to further improve the stability and accuracy of the algorithm.Numerical simulation and experiment analysis confirmed the validity and accuracy of this method.