F-X域粘弹性波动方程保幅偏移

Finite-difference migration with compensation for absorption, dispersion and transmission losses in seismic data

1. 中国地质科学院地质所,北京100037;2. Center for Lithospheric Studies,The University of Texasat Dallas Richardson,Tx75083-0688;3. 中国石油勘探开发研究院西北分院,甘肃兰州730020;4. 中国地质大学,北京100083;5. 中国石油天然气股份有限公司开发局,北京100083

1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Center for Lithospheric Studies, The University of Texas at Dallas Richardson, Tx 75083-0688, USA;3. Northwest Geological Institute, China National Petroleum Corporation, Lanzhou 730020, China;4. China University Geosciences (Beijing), Beijing 100083, China;5. China National Petroleum Corporation, Beijing 100083, China

提出了一种利用粘弹性声波波动方程进行偏移的新方法。其基本思路是,修改成像条件,使修改后的成像方程中考虑振幅补偿,然后利用粘弹性、单程波动方程在F-X域对震源和接收点波场进行延拓,进而完成散射、透射等补偿。理论数据处理和实际地震资料处理表明,该方法理论基础可靠,处理效果明显,能较好地解决实际地质问题。

When seismic waves propagate through the earth, energy is partitioned at the interfaces. The partition depends on the contrast of the physical parameters between the layers. Anelasticity also progressively reduces the energy along the ray path. In routine seismic data processing, empirical amplitude balancing or AGC is often used for gaining amplitude.However,these methods lack a solid physical basis.This paper presented an alternative method that compensates Q and transmission losses in the seismic data during scalar finite difference migration. The geometrical spreading,Q and transmission losses and dispersion are compensated simultaneously as part of the migration. The migration uses a 2-D, F-X 65-degree one way depth stepping extrapolation.