1. Seismic attenuation (Q) model

I was frequently requested for sharing the Q synthetic model in my Geophysics paper (Zhu et al., 2014). I realized it might be useful for YOU so I would like to share this Q model here.

Figure shows velocity and Q models. The top area with low Q purposely denotes gas chimney. The Q anomaly is plotted using a matlab polygon-plot function. In my simulations, I smooth this Q model that is included in file as well. The model size is 398*161 with dx=dz=25 meters. All files are saved in MATLAB format and download here: Qmodel.mat [BP_cut_model_gas_chimney.mat-24pnkvq. Please feel free to use it for your research.

Please consider to cite my paper: Zhu T., Harris J. M., and Biondi B. (2014), “Q-compensated reverse time migration”, Geophysics, 79, no 3, S77-S87, doi: 10.1190/geo2013-0344.1.

Figure 1 shows velocity and Q (1/attenuation) models.

2. Geophysical properties of materials 

Download here [some-useful-engineering-numbers.pdf]

The file collects many geophysical values of common rocks and fluids, e.g. P-wave velocities, resistivity, and density. They seem to be useful as a reference in your desktop (at least for me). I am glad to hear they are useful for you. In past years, the document is the most downloaded one in my webpage. [The document was found somewhere from GOOGLE few years ago (I could not find it now). If you know the original, please let me know.]