Macro-model independent migration to zero offset (CRS-MZO)

The Common-Reflection-Surface (CRS) stack is a well-established time imaging method that provides high quality stacks of three or two-dimensional seismic data and also important kinematic wavefield attributes as a byproduct. In the present work, we build from the CRS a common diffraction surface (CDS) and migrate multicoverage seismic data to zero-offset. The migration to zero offset CRS-MZO operator is defined by a second order (hyperbolic) travel time approximation that depends on two wavefield attributes (or CRS parameters): the emergence angle of the normal ray and the radius of curvature of the normal incidence point (NIP) wave. This parameter estimation is carried out by means of optimization procedures using as objective function the coherence (semblance) of the seismic traces along the CRSMZO operator. The CRS-MZO method is tested using the 2D Marmousi synthetic data and finally applied to 2D land seismic data of the Tacutu Basin (Brazil).