利用CFP技术解决复杂近地表问题综述

复杂近地表条件会降低地震数据的质量,通常采用基于地表一致性的时移静校正消除其影响.但静校正与速度是密不可分的,而确定复杂近地表速度是非常困难的.基于CFP技术处理复杂近地表问题时避免了对速度的直接操作,使得静校正和速度的确定相互独立.首先根据叠前数据估算出波场的传播算子,然后依据等时原理在DTS模板中进行算子更新,再用这些更新的算子重建基准面和实现近地表单程时间成像.获得正确的算子振幅也是重建基准面的关键.

Review of using CFP technology to resovle complex near surface rroblems

Complex near surface condition degrades the quality of seismic data.Conventionally we adopt the time shift static correction based on surface consistency to eliminate its effects.Velocity analysis and statics are coupled,but to determine velocity of complex near surface is quite difficult.Handling complex near surface problem based on common focus point avoid direct operation for velocity,which make statics and velocity be independent.Firstly we estimate operator of wavefield propagation by the prestack data,it updated operators DTS(different time shift)panel by the principle of equal traveltime,then make use of these updated operators to redatum and a one-way time image of near surface.Obtaining correct operator amplitude is also key to redatuming.