小波多尺度井间地震波形层析成像方法

Tomographic method for cross-hole seismic waveform by wavelet in a multi-scale.

裴正林 ,余钦范 .小波多尺度井间地震波形层析成像方法 .石油地球物理勘探 ,2 0 0 1,36 (6 ) :6 80～ 6 89井间地震波形层析成像是一个很复杂的非线性反演问题。常规线性化反演方法的处理结果依赖于初始模型的选择 ,容易陷入局部极小 ;对于复杂模型和大扰动模型 ,用常规线性化反演方法无法得到满意的解。本文提出了小波多尺度井间地震波形层析成像方法。数值实验结果表明 ,小波变换多尺度反演方法极大地改善了现行的线性化反演方法的性能 ,成像效果显著 ;同时 ,该方法还能提供不同分辨率的反演图像 ,有利于图像解释。

Cross-hole seismic waveform tomography is very complicated non-linear inversion problem. The results of conventional linear inversion method depends on selection of initial model and easily falls into local minimum; unsatisfied results are obtained from conventional linear inversion for complex model and model of big disturbance. The paper presented a tomographic method for cross-hole seismic waveform by wavelet in a multi-scale. Numeric model test showed that the inversion method for wavelet transform in a multi-scale can greatly improve inversion and has a prominent imaging effect; meanwhile, the method can also provide inversion images in a different resolution, which are of benefit to image interpretation.