Seismic Traveltime Tomography
The word tomography comes from the Greek tomos, meaning to cut or slice. Thus, tomography is based on the premise that observed data sets are related to line integrals along lines or rays (i.e., projections) of some physical quantity. Tomography is used to reconstruct a model of the desired physical object so that the model's projected data agree approximately with measurements. A classic geophysical tomography problem is the reconstruction of a seismic velocity model of some portion of the earth in which the computed traveltimes agree with the observed traveltimes. In other words, traveltime tomography is a procedure that allows us to invert observed seismic traveltimes to estimate the subsurface velocity structure.
Figures & Tables
Fundamentals of Geophysical Interpretation, SEG Geophysical Monograph Series No. 13, is a practical handbook for the petroleum geophysicist. Fundamental concepts are explained using heuristic descriptions of seismic modeling, deconvolution, depth migration, and tomography. Pitfalls in processing and contouring are described briefly. Applications include petroleum exploration of carbonate reefs, salt intrusions, and overthrust faults. The book includes past, present, and possible future developments in time-lapse seismology, borehole geophysics, multicomponent seismology, and integrated reservoir characterization.