复赛谱域提取混合相位子波的方法  

METHOD OF MIXED PHASE WAVELET EXTRACTION IN CEPSTRUM DOMAIN

作　　者：李国发[1] 彭苏萍[1] 高日胜[1] 何兵寿[1] 赵国平[1] 

机构地区：[1]中国矿业大学资源与安全工程学院

出　　处：《天然气工业》2005年第1期85-87,共3页Natural Gas Industry

基　　金："973"国家重点基础研究发展规划项目"中国煤层气成藏机制及经济开采基础研究"(2002CB11700)资助~~

摘　　要：为有效地提高地震资料的分辨率,提出了一种新的混合相位地震子波提取方法。相同振幅谱、不同 相位谱的地震子波分别对应不同的最大和最小相位分量。在复赛谱域,遵照一定的规则,子波振幅谱可以分割为 两部分,其分别对应于子波的最大和最小相位分量,分割比例的不同决定了子波不同的相位,由此可以得到最大相 位子波、最小相位子波、零相位子波和一系列混合相位子波。根据地震记录信噪比谱的情况,设定地震记录的希望 输出子波,对地震记录进行确定性子波反褶积。依据反褶积后地震记录方差模大小和分辨率情况,最终从一系列 相同振幅谱不同相位谱子谱集合中确定理想的混合相位子波,通过确定性子波反褶积达到提高地震记录分辨率的 目标。对理论合成地震记录和实际地震记录进行了子波提取实验,并利用提取的地震子波对地震资料进行了提高 分辨率的处理,实验结果表明了该方法的正确性和有效性。In order to enhance the resolution of seismic data, a new method of mixed phase wavelet extraction is presented in the paper. The wavelets with the same amplitude spectrum and different phase spectrums are correspondent to different maximum-and minimum-phase components respectively. In cepstrum domain, according to a certain rule, the wavelet amplitude. spectrums may be divided into two parts corresponding to the maximum-and minimum-phase components of wavelets respectively, and different phases of wavelets are dependent upon different division proportions, thus achieving the maximum-phase, minimum-phase, zero-phase wavelets and a series of mixed phase wavelets. In light of signal-to-noise ratio spectrums, the desired output wavelets can be defined and the determinacy wavelet deconvolution may be carried out for seismic records. According to the variance module and resolution after deconvolution, the ideal mixed phase wavelets may be extracted from the wavelet gatherings with the same amplitude spectrum and different phase spectrums finally. Therefore the target for raising the resolution of seismic records can be attained by the determinacy wavelet deconvolution. Through the wavelet extraction tests for theoretic synthetic records and actual seismic data and the processing of enhancing resolution of seismic data by use of the wavelets extracted, it was shown that such a method is correct and effective.

关 键 词：复赛谱域 混合相位子波 地震勘探 振幅谱 反褶积 

分 类 号：P631.4[天文地球—地质矿产勘探]