零相位校正和子波反褶积
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摘要
熵,作为描述一个序列有序程度的量,从热力学引入地震处理中,用以描述反射系数的随机程度,并把它作为一种约束条件应用到反褶积技术中。在陆相薄互层地质结构中,地层在局部不能表现出较强的反射值,但在整体上具有强反射界面的特点,在应用最小熵反褶积时,要有强反射界面作为约束。在子波反褶积和零相位校正中,子波相位求取在约束条件下是个最优化问题。本文研究了最小熵反褶积的应用条件,根据陆上地震勘探中子波延迟较短的特点,改进了前人在应用模拟退火法中对子波长度已知的假设,简化了输入条件,在最小熵的约束下完成了零相位校正和子波反褶积。
As a measurement describing chaos of a time series, entropy is coming from thermodynamics to describe randomness of reflection coefficient, and it is applied to deconvolution as one constraint condition. For continental thin layer geological structure there are not stronger reflection locally, but in the whole there are strong reflection. Minimum entropy deconvolution is constrained to strong reflector. When wavelet deconvolution and zero phase are corrected, wavelet phase extraction is actually a problem of optimization. This paper studies conditions of minimum entropy deconvolution, and according to the shorter wavelet delay on land seismic exploration wavelet length known assumption are improved, input conditions are made easy and under the conditions of minimum entropy constraint zero phase correction and wavelet deconvolution are completed.
As a measurement describing chaos of a time series, entropy is coming from thermodynamics to describe randomness of reflection coefficient, and it is applied to deconvolution as one constraint condition. For continental thin layer geological structure there are not stronger reflection locally, but in the whole there are strong reflection. Minimum entropy deconvolution is constrained to strong reflector. When wavelet deconvolution and zero phase are corrected, wavelet phase extraction is actually a problem of optimization. This paper studies conditions of minimum entropy deconvolution, and according to the shorter wavelet delay on land seismic exploration wavelet length known assumption are improved, input conditions are made easy and under the conditions of minimum entropy constraint zero phase correction and wavelet deconvolution are completed.
引文
[1]W T W ood.Sim ultaneousdeconvolution and w aveletinversion as aglobaloptim ization.G eophysics,1999,64(4)
[2]D W Oldenburg,and etal.W aveletestim ation and deconvolution.Geophysics,1981,46(11)
[3]S Treitel and E A.Robinson.M axim um entropy spectral decom position of a seism ogram into its m inim um entropy com ponentpulse noise.Geophysics,1981,46(8)
[2]D W Oldenburg,and etal.W aveletestim ation and deconvolution.Geophysics,1981,46(11)
[3]S Treitel and E A.Robinson.M axim um entropy spectral decom position of a seism ogram into its m inim um entropy com ponentpulse noise.Geophysics,1981,46(8)
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