APPLICATION OF MULTI-TIME-WINDOW SYNTHETIC SEISMOGRAMS IN SOUTH YELLOW SEA
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摘要: 南黄海以往一般采用单时窗合成地震记录,即对测井曲线求得反射系数与理论子波进行褶积,但由于地层浅部和深部的频率不同,导致合成地震记录和实际地震剖面吻合得不好。提出了对地震资料采用分时窗提取子波合成地震记录的方法,从井旁地震道提取地震子波进行频谱分析,地层浅部和深部地震子波的主频和波形不同,并考虑时延特性,采用分析结果的地震子波进行分时窗合成地震记录。与以往用单时窗合成地震记录相比,分时窗合成地震记录提高了合成地震记录与地震波组的吻合度和分辨率。Abstract: Single-time-window synthetic seismograms has been widely used in the past in the seismic survey in the South Yellow Sea. Reflection coefficients was picked out from logging curves and convoluted with theoretical wavelets, so the frequencies for the shallow and deep layers are different, leading to the poor match of the synthetic seismograms to the real seismic profiles. This paper proposes a method to extract seismic wavelet from multi-time-window synthetic seismograms followed by spectrum analysis. Since the wavelet frequency and waveform are different in the shallow and deep strata, time delay is considered, and the results of seismic wavelet are applied to the multi-time-window synthetic seismograms. Multi-time-window synthetic seismograms has advantage of the match degree of synthetic seismograms and seismic wave group and the resolution,comparing with the previous single-time-window synthetic seismograms.
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Key words:
- multi-time-window /
- wavelet /
- synthetic seismograms /
- South Yellow Sea
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