Abstract: The routine application of 3-D prestack migration to the imaging of large-scale 3-D marine surveys requires the development of migration methods that are more computationally efficient than conventional Kirchhoff migration. To prestack image marine data we propose an efficient two-step procedure. The first step transforms the recorded data into effective common-azimuth data by applying a pres tack partial- , migration operator (AMO). The common-azimuth data synthesized by AMO is then imaged in depth using a new commonazimuth downward continuation operator. The main advantage of common-azimuth downward continuation is that the computations are carried out in the original 4-D space, as opposed to the 5-D space that would be required by straightforward application of full-prestack downward continuation. We applied common-azimuth migration to two synthetic data sets: the first data set was generated assuming a vertical velocity gradient, the second one assuming a velocity gradient with components along both the vertical and horizontal axes. Common-azimuth migration correctly imaged the reflectors in both cases.
Publication Year: 1995
Publication Date: 1995-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot