Model-based time-preserving tomography

摘要

A system and method for modeling seismic data using time preserving tomography including storing an initial set of parameter values representing an initial seismic data model. The initial seismic model may correspond to at least two or more ray pairs. Each ray pair may have a traveltime. An altered model may be generated by altering two or more parameter values in the initial set of parameter values for each of two or more ray pairs in the initial model. Altering one parameter value without altering the remaining of the two or more parameter values may correspond to a change in the traveltime of each of the ray pairs, while altering the two or more parameter values in combination typically corresponds to no net change in the traveltime of each of the ray pairs.

主权项

1. A method for the perturbation of a background subsurface model using time preserving tomography, the method comprising:
in a processor:
storing values for an initial set of parameters representing an initial background subsurface model, wherein the initial model corresponds to at least a plurality of ray pairs, each ray pair comprising a traveltime;generating an altered model by altering values of the individual parameter in the set and, based on linear relationships between perturbations for the individual parameter in the set and perturbations for one or more other parameters in the set, altering values for the one or more other parameters in the set associated with an equal and opposite change in the traveltimes of each of the ray pairs in the initial model, wherein the total traveltime of each of the ray pairs in the altered model is identical to the total traveltime of each of the ray pairs in the initial model.