摘要:
在地震资料采集过程中,不可避免地会遇到一些障碍区域,如某段区域由于地形特殊性无法放炮而只能放置接收器,在这种特殊观测系统下,若依然只利用一次波作为有效波,可能会出现地下结构成像信息不足。而如果此区域有比较发育的多次波,尝试将多次波和一次波同时作为有效信息用于波场逆向延拓,在震源记录中同时加入一次波和多次波成像所需的震源信息用于正向延拓,并引用2D反褶积成像条件,从而实现多次波和一次波联合成像,获取比常规一次波成像更加丰富的成像信息。模型数据和实际资料测试结果表明,此方法技术可以实现对障碍观测区域成像信息的补充,说明多次波信息在一些障碍观测区域应用的有效性。
Abstract:
Primaries are usually regarded as the only seismic signals used for seismic imaging. However, when seismic acquisition en?counters some obstacle areas where no shooting can be made and only the installation of receivers can be conducted, there are seismic imaging gaps because of missing seismic primaries. Given the developed multiples in obstacle area, the authors proposed a method a?chieving joint imaging by using primaries and multiples. The method employs sum of impulsive source and recorded primaries and multi?ples as source wavefield and the wavefield consisting of recorded primaries and multiples as back?extrapolated wavefield under the 2D deconvolution imaging condition. Tests on Sigsbee2B dataset and field data show that the method could provide more valuable imaging information and complement the lack of seismic primary imaging caused by obstacle topography. Tests on Sigsbee2B dataset and field data show that the method is workable and effective.
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