摘要
在主要利用地震一次波信息进行成像的背景下,当地震资料采集过程中遇到某些无法放炮而只能放置检波器的障碍地段,会出现地下构造成像信息不足。若此区域地震多次波比较发育,可以尝试将多次波视为有效信息进行利用。在障碍地段的检波点处设置虚拟炮点和虚拟接收点,通过互相关和叠加的方法技术将多次波降阶构建虚拟一次波;通过虚拟一次波偏移成像,实现观测系统障碍区域的多次波成像,并用于补充地震一次波成像信息的缺失,从而获得更加丰富和完整的地下构造成像信息。模型数据和实际资料测试结果证明了该方法技术的可行性和有效性。
Primaries are usually regarded the only seismic signals used for seismic imaging.However,at some obstacle area,shots cannot be deployed,which leads to seismic imaging gap because of missing seismic primaries in the acquired data.Therefore,at the obstacle area with developed multiple,we proposed using multiple imaging to complement the missing seismic primaries imaging.Firstly,cross-correlation and stacking techniques are utilized to construct pseudo-primary from multiples.Then,multiple imaging is realized by pseudo-primary imaging for the obstacle area,which is used for complementing the information of primary imaging and obtain more details about the structures.Tests on Sigsbee2b dataset and field data show that the method is workable and effective.
出处
《石油物探》
EI
CSCD
北大核心
2013年第1期72-78,6,共7页
Geophysical Prospecting For Petroleum
关键词
障碍地形
多次波
互相关
虚拟一次波
地震成像
obstacle topography
multiple
cross-correlation
pseudo-primary
seismic imaging
