Types of Modeling |
There are many types of seismic modeling from simple well log synthetics, through complex 3-D raytrace modeling and on to full-elastic wave equation modeling. Accuracy, time and economic constraints must be considered in selecting the modeling type.
Raytrace modeling simplifies sounds path by simulating one raypath from source to receiver. Raytracing is often a good choice for investigating seismic effects because:
Above: East-west cross section of Ship Shoal South 3-D model showing common-reflection-point gather (CRP) raypaths for selected bins on a 4300m subsalt horizon. For clarity, only every 20th CRP is shown. Note that the CRP display is effective in indicating the imaging problems below the salt edge at 10,000m distance along the model.
Wave Equation modeling, solves differential equations by approximating wave front motion between small cells of model.
Above: 2-D acoustic finite difference model with wave field penetrating and reflecting from a salt body