基于改进广义S变换的复赛谱时频域反褶积方法

时频域反褶积的关键在于时变子波的提取和时频谱分析,传统的时频域反褶积基于反射系数满足白谱特性的假设,同时受Gabor变换时窗固定性的影响,使反褶积结果缺乏准确性。通过调节改进广义S变换参数,获得衰减地震记录的时频谱,将其变换到复赛谱时频域提取子波时频谱,从而实现复赛谱时频域反褶积。对原有的时频域反褶积算法进行改进,提高算法的稳定性,同时在复赛谱时频域提取子波摆脱反射系数是白谱特性的假设。理论模型论证和实际数据处理结果表明,该方法能够有效地提高地震记录分辨率,并恢复地层对地震波的衰减。
The key to time-frequency domain deconvolution is time-varying wavelet extraction and analysis of time-frequency spectrum. The traditional time-frequency domain deconvolution is influenced by Gabor transform time window fixation, and is based on the assumption that reflection coefficient satisfies white spectrum characteristic, leading to inaccuracy in deconvolution results. An improved generalized S-transform is introduced to obtain the time-frequency spectrum of non-stationary seismic records, which is then transformed into the cepstral time-frequency domain to achieve the time-frequency deconvolution. The conventional time-frequency domain deconvolution algorithm is improved by enhancing the stability of the algorithm, and by removing the white spectrum assumption in reflection coefficients. The comparison between the synthetic modeling results and the actual data suggests that this method can improve the resolution and can successfully model the attenuation of the seismic wave in seismic records