CAJ | 학술논문

为了降低偏移成像方法的计算成本，利用地震数据的广义合成技术，将共炮道集数据及其震源转化为合成道集与合成震源．结果表明，通过将频率空间域的地震数据广义合成技术与频率空间域的逆时偏移成像方法相结合，可以使频率空间域逆时偏移的计算效率提高1．5～3倍，而且可以得到与常规共炮道集频率空间域逆时偏移基本相同的成像结果．相比于随机合成数据逆时偏移，平面波数据逆时偏移不含随机交叉噪音，可以得到更好的成像结果．
위료강저편이성상방법적계산성본，이용지진수거적엄의합성기술，장공포도집수거급기진원전화위합성도집여합성진원．결과표명，통과장빈솔공간역적지진수거엄의합성기술여빈솔공간역적역시편이성상방법상결합，가이사빈솔공간역역시편이적계산효솔제고1．5～3배，이차가이득도여상규공포도집빈솔공간역역시편이기본상동적성상결과．상비우수궤합성수거역시편이，평면파수거역시편이불함수궤교차조음，가이득도경호적성상결과．
In order to reduce the computational cost of migration imaging method ,we transformed common shot gathers data and its source into synthetic gathers and synthetic source by using generalized seismic data synthesis theory .The results show that given the advantage of frequency‐space domain in numerical calculation relative to the time‐space domain , reverse‐time migration based on generalized seismic data synthesis in the frequency space domain can greatly improve the computational efficiency ,computational efficiency can be improved 1 .5 to 3 times , and the imaging results are equivalent to the conventional reverse‐time migration in frequency‐space domain . Numerical experiment results also show that the imaging results of plane wave gathers reverse‐time migration don’t have random cross‐talk ,are better than random synthetic data reverse‐time migration .