频谱比法求取品质因子的精度分析

Accuracy Analysis about the Spectral Ratio Method to Calculate the Quality Factor

介质的品质因子反映了其吸收衰减的特性,精确的品质因子在地震勘探中对于补偿被近地表和地层吸收的地震波能量必不可缺。目前求取品质因子常用的方法是频谱比法及其改进方法,地震子波类型、噪音、截断及拟合区间的选取是影响频谱比法的重要因素,通过理论模型计算分析这些因素对频谱比法精度的影响。

The quality factor of medium reflects the characteristics of absorption and attenuation,and accurate quality factor plays an important role in seismic exploration,because it is essential for compensation energy absorbed by near surface and rock formation. At present,the most widely used method to calculate quality factor is spectrum ratio method. The type of seismic wavelet,noise,cutting and fitting interval are three important factors to influence the accuracy of spectral ratio method. The theoretical model calculation and analysis of these three factors on the influence of the accuracy of spectral ratio method have a great significance for better use this method.