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《Chinese Journal of Geophysics》 1997-04
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ZERO CROSSING PROPERTY OF WAVELET TRANSFORM AND IMPROVEMENT OF BOTH SEISMIC SIGNAL NOISE RATIO AND RESOLUTION

LI KUN-PENG;LIU YE-XIN; LI YAN-DA; FAN CUN-KUI (Tsinghua University, Beijing 100084, China)  
We study the zero crossing properties of wavelet transform. A new method is developed to improve signal noise ratio and resoultion of seismic section based on the properties of wavelet transform zero-crossings and good correlations between reflected waves of neighbouring seismic traces. Firstly, the properties of wavelet transform zerocrossings are used to match two neighbouring seismic traces in order to obtain the varied information of reflector. Then, according to the matching results, the coefficients of wavelet transforms are picked out to fit a polynomial by using SVD-TLS. Thirdly, to suppress the noise the polynomial fitting values are used to replace the coefficients of wavelet transforms. finally, the energy of high frequency components of seismic trace is strengthened, and the high resolution seismic traces are reconstructed from their filtered wavelet transform coefficients by use of the inverse wavelet transforms. Processing results show that this method can improve both signal noise ratio and resolution of seismic section.
【Fund】: 国家自然科学基金
【CateGory Index】: P315
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