The methodologies described in this Chapter have several
fundamental limitations. Most importantly, they require an accurate
forward modeling operator: both the physics of wave propagation and the
true earth velocity must be accurately modeled.
While the physics of wave-propagation is well-understood, earth
velocity models are never completely true-to-life.
Another important caveat is that the wave-equation methods outlined
here require the data and models to be represented on a regular grid.
While we can choose our model-space, prestack seismic data is never
recorded on a perfectly regular grid. Before we can apply the
techniques described here, we need to regularize the data.
Chemingui (1999) and Fomel (2000) provide two
ways of achieving this goal.
Stanford Exploration Project