Estimation of layer parameters for linear P- and S-wave velocity functions

作者：Stovas Alexey^*; Ursin Bjorn

来源：Geophysics, 2007, 72(3): U27-U30.

DOI：10.1190/1.2709423

For a horizontally layered medium with isotropic layers with constant P- and S-wave velocity gradients, it is possible to estimate the velocity functions (gradient and velocity at the top of each layer) and thickness of each layer. From large-offset PP seismic reflections, one can estimate three traveltime parameters: the zero-offset two-way traveltime, the NMO velocity, and a heterogeneity coefficient responsible for the nonhyperbolicity of the traveltime curve, using the different traveltime approximations. From large-offset (offset/depth greater than two) PS seismic reflections, one can estimate two traveltime parameters: zero-offset two-way traveltime and NMO velocity. From the estimated traveltime parameters at the top and bottom of a layer, it is possible to compute the thickness and velocity functions of the layer.

• 出版日期2007-6