This small utility was developed to quickly generate AVO curves based on a simple isotropic interface model from a LAS file containing p-wave, s-wave and density logs.
It utilizes the exact solution of Zoeppritz equation for incident angle dependent Rpp (Aki and Richards, 1980), and the linear Shuey equation for intercept and gradient calculation.
Stochastic realizations of a selected interface can be computed by Monte Carlo simulation based on random sampling of correlated multi-gaussian distributions using Cholesky decomposition.
2D probability density functions of Rpp or P-G can be generated using the simulated realizations.
The generated realizations and interface models can be exported for further analysis. Generated 2D PDF can be exported in Rokdoc format.
The workflow is simple:
Model definition: ctrl+left click
Zoom on logs: left click +drag
Unzoom: left click
Pan: right click+drag
Interfaces can be saved or delete with +/- buttons
Aki, K, and PG Richards (1980). Quantitative Seismology: Theory and Methods. WH Freeman and Co.
Shuey, R.T. 1985. A Simplification of the Zoeppritz Equations - Geophysics, 50, 609 - 614
The application was coded using FPC and Lazarus. Dmath library was used to code the hard stuff. Images from FatCow Farm Fresh Icons were modified to use in this app.