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瞬变电磁场拟波动方程偏移成像
Quasi wave equation migration of transient electromagnetic field
【摘要】 本文提出了一种新的瞬变电磁场偏移成像方法。该方法满足扩散方程的低频电磁场,并可由积分变换转换为满足波动方程的波场,然后直接利用地震偏移成像技术,求取介质的几何参数。文中针对有源二维地电模型,推导出了与瞬变电磁场定解问题相对应的变换波场的定解问题方程,并采用有限差分逆时深度偏移方法,成功地对有源二维瞬变电磁场进行了偏移成像处理,得到了清晰的、与理论模型吻合很好的偏移断面图像。
【Abstract】 A new migration method for transient electromagnetic field is recommended here. The method is applicable to low-frequency electromagnetic field that is expressed by diffusion equation. In terms of this method, the low-frequency electromagnetic field is converted, using integral transform, into a wave field expressed by wave equation; then, geometric parameters of medium are estimated by using seismic migration technique. For a 2-D geoelectric model with source, the solution equations of converted wave field are deduced, which correspond to those of transient electromagnetic field. By using finite difference reverse-time depth migration,the migration processing of 2-D transient electromagnetic field with source is successfully finished to produce clear migrated section that coincides with theoretical model.
【Key words】 transient electromagnetic field; wave field conversion; wave equation; migration image;
- 【文献出处】 石油地球物理勘探 ,OIL GEOPHYSICAL PROSPECTING , 编辑部邮箱 ,1999年05期
- 【分类号】P631.4
- 【被引频次】40
- 【下载频次】227