Reverse time migration based on normalized wavefield decomposition imaging condition

• 作 者: YU Jianglong HAN Liguo ZHOU Yan ZHANG Yongsheng
• 机 构: College of Geo-Exploration Science and Technology,Jilin University,Drilling Division,CNPC Offshore E
• 出 处: Global Geology
• 发表日期: 2016年02期
• 关键词: reverse time migration low-frequency noises imaging condition wave field decompo

With the increasing complexity of prospecting objectives,reverse time migration( RTM) has attracted more and more attention due to its outstanding imaging quality. RTM is based on two-way wave equation,so it can avoid the limits of angle in traditional one-way wave equation migration,image reverse branch,prism waves and multi-reflected wave precisely and obtain accurate dynamic information. However,the huge demands for storage and computation as well as low frequency noises restrict its wide application. The normalized cross-correlation imaging conditions based on wave field decomposition are derived from traditional cross-correlation imaging condition,and it can eliminate the low-frequency noises effectively and improve the imaging resolution. The practical procedure includes separating source and receiver wave field into one-way components respectively,and conducting cross-correlation imaging condition to the post-separated wave field. In this way,the resolution and precision of the imaging result will be promoted greatly.

With the increasing complexity of prospecting objectives, reverse time migration (RTM) has attracted more and more due due to its outstanding imaging quality. So it can avoid the limits of angle in traditional one-way The wave equation migration, image reverse branch, prism waves and multi-reflected wave precisely and obtained accurate dynamic information. However, the huge demands for storage and computation as well as low frequency noises restrict its wide application. The normalized cross-correlation imaging conditions based on wave field decomposition are derived from traditional cross-correlation imaging condition, and it can eliminate the low-frequency noises effectively and improve the imaging resolution. The practical procedure includes separating source and receiver wave field into one-way components respectively, and conducting cross -correlation imaging condition to the post-separated wave field. In this way, the resolution and precision of the imaging result will be promoted greatly.