2D modeling and basic processing with Madagascar |

**Pongthep Thongsang, Lian Jiang, Hao Li, and Karl Schleicher**

k_schleicher@hotmail.com

John A. and Katherine G. Jackson School of Geosciences

The University of Texas at Austin

University Station, Box X

Austin, TX 78713-8924

This document demonstrates finite difference modeling and simple processing
using the Madagascar software package. The paper uses this simple processing
sequence to teach the basics of Madagascar.

The SEGY file of the Marmousi2 model is downloaded from the Internet and used to create a few synthetic shots. Geometry is computed and loaded in the trace headers. Simple processing including amplitude correction, CMP sorting, velocity conversions, NMO correction, stack, Kirchhoff migration, and least squares Kirchhoff migration are applied. Displays of each processing stage are created. The full processing sequence takes less that 6 minutes on a 2013 MacBook Pro computer.

This processing sequence was developed at the 2017 Seismic Working Workshop - Reproducible Tutorials in Houston. All processing can be reproduced using an SConstruct file.

- Introduction
- Download, Reformat, Smooth, and Display the Marmousi2 Velocity Model
- Finite Difference Model Shotpoints, Model and subtract the direct arrivals
- Compute RMS Velocities, NMO, T-shift, Amplitude Correction, Stack
- Post stack Kirchhoff Migration and Least Squares Kirchhoff Migration
- Acknowledgements
- Appendix
- Bibliography
- About this document ...

2D modeling and basic processing with Madagascar |

2019-01-30