【摘要】 井间地震作为一种高分辨率地震方法在数据采集时存在大量的随机噪声。笔者采用改进的F-X域经验模态分解(empirical mode decomposition,简称EMD)方法,将信号转换到F-X域后分解成一系列固有模态函数,进而通过滤波来达到去噪目的。通过对理论数据和实际井间地震数据的处理与分析,得出如下结论:此方法不依赖于基函数的选择,具有很强的自适应性,对于消除井间地震数据中的噪声以及提高地震数据的信噪比有较好的效果。更多还原

【Abstract】 Cross well seismic technology is a high-resolution geophysical method with random noise.In this paper,the improved Empirical Mode Decomposition(EMD) method in the F-X domain is employed for noise attenuation.Signals are decomposed into a series of intrinsic mode functions(IMFs) after being transformed into the F-X domain and then filtered by the soft threshold function for noise attenuation.The processing of the emulated data and practical data with the improved EMD method in the F-X domain shows a great advantage in noise attenuation for the cross well seismic data and thus can achieve a good result in improving the SNR of the seismic data.In addition,the method does not depend on the basic function.更多还原