合成地震记录制作中存在的问题及对策

Problems and solutions in construction of synthetic seismogram

通过正演模型分析含气砂岩在地震和测井资料中的不同反应特征,以及两者在制作合成地震记录时存在的不匹配现象得出,在地震和测井中求得的反射系数存在较大差异,不能直接进行对比,为此,提出了在制作合成地震记录时必须考虑流体(油、气、水)因素,不能只通过对比两者的振幅、频率和相位等来判断合成地震记录的正确性。在此基础上,总结出了相应的技术对策。

Mismatching lies in construction of synthetic seismogram as shown by the analysis of seismic and well-logging responses of gas sand using forward modeling. Reflection coefficients computed from seismic data are different and incomparable to that from well-logging data. The validity of synthetic seismogram cannot be judged only in terms of amplitude, frequency and phase. We believe that fluid factors should be considered in constructing synthetic seismogram and some strategies were presented.