1887

Abstract

Conventional seismic processing uses only primary reflections for imaging, and treats high-order reflected events (multiples) as noise. Separated Wavefield IMaging (SWIM) uses the downgoing pressure wavefield to exploit the extended illumination provided by surface-multiple energy, effectively converting all receivers into virtual sources. We present a Least-Squares inversion solution for depth migration of the full reflected wavefield that includes both primary and high-order reflected energy. Standard migration of primaries and SWIM are complementary and can augment the overall imaging results when they are combined correctly. Whilst full-wavefield migration (FWM) is able to jointly image both primary and high-order reflected energy, it cannot easily balance the contribution of each component, and also involves crosstalk due to the natural blending scheme. The Least-Squares full wavefield migration (LS-FWM) described here directly computes the earth’s reflection image in an iterative manner, thereby avoiding crosstalk noise. Successful applications to both synthetic and field data examples demonstrate that LS-FWM greatly improves the imaging illumination and resolution compared to conventional migration.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201801968
2018-06-10
2024-03-28
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201801968
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error