The frontal structure of longmenshan in the west of sichuan is very complex , showing intense structure deformation in overthrust belt , high structure amplitude , steep stratigraphic dip , developed fault blocks , complex seismic wave field , frequent change of lateral velocity , and poor image of post - stack time migration processing 摘要川西龍門山前緣構(gòu)造非常復(fù)雜,逆掩推覆構(gòu)造帶構(gòu)造形變強(qiáng)烈,構(gòu)造幅度大,地層傾角陡,斷塊發(fā)育,地震波場(chǎng)復(fù)雜,速度橫向變化大,常規(guī)疊后時(shí)間偏移處理成像效果較差。