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在时间域 ,合成地震记录是地震子波与反射系数的褶积。深度域的合成地震记录也与时间域类似。只不过先要将时间域的子波转换成深度域的子波 ;然后利用声波时差曲线和密度曲线计算出深度域的反射系数 ,再二者褶积便可得到深度域的合成地震记录。本方法的关键在于提取子波和计算反射系数。要在深度偏移剖面上选取品质较好的井旁地震道计算子波的主频 ,要选用零相位子波。在计算反射系数之前 ,要对声波时差曲线和密度曲线进行校正、去野值等处理
In the time domain, synthetic seismograms are the convolution of seismic wavelet and reflection coefficient. Synthetic seismograms in depth are also similar in time domain. Only the wavelet in the time domain is first transformed into the wavelet in the depth domain; then the reflection coefficient in the depth domain is calculated by using the acoustic time difference curve and the density curve, and then the synthetic seismogram in the depth domain can be obtained by convolution. The key of this method is to extract the wavelet and calculate the reflection coefficient. To select the good quality well-side seismic traces on the depth migration profile to calculate the fundamental frequency of the wavelet, zero-phase wavelet should be selected. Before calculating the reflection coefficient, to correct the acoustic time difference curve and density curve, to go out of value processing