Converted-wave (C-wave) energy on P-wave marine data can be prevalent on subsalt seismic images. Despite being generally weaker than the P-wave energy, C-wave energy can be strong enough to interfere with interpreting salt and subsalt events in geologically complex areas with poor subsurface illumination such as salt/sediment boundaries.
We propose a technique to model and successfully attenuate C-wave energy related to the base of salt to reveal the underlying subsalt image. Many methods have been proposed to model and remove the C-wave energy pre-migration (Lu et al. 2003) and others proposed forward modeling and subtraction post migration (, ). We propose a method that allow a pre-migration modeling and post-migration curvelet domain adaptive subtraction for the C-waves removal. To demonstrate the effectiveness of our methodology, we present two case studies; a synthetic example and a real data example from the Mississippi Canyon area of the Gulf of Mexico. The results show that the converted-wave attenuation (CWA) workflow successfully attenuated the C-wave energy and significantly improves the image interpretability.
Presentation Date: Thursday, September 28, 2017
Start Time: 8:55 AM
Location: 361A
Presentation Type: ORAL
