- [Voiceover] We've developed some fairly extensive rock physics modeling based upon Gassmann and Krief geophysical models. And what we've done is, the ability there is we can generate pseudo acoustic and compressional data, and we can also create a full set of mechanical properties. So, what we do is to use the density logs to create pseudo acoustic compressional and shear data. You need to have input for matrix and shale, acoustic responses, and adjust those to, if you have measured compressional and shear time, adjust it so that the pseudo logs agree with the measured logs. However, if, for example, you've got a reservoir where you've made this kind of comparison, and have calibrated this system, you can then create, if you don't have a shear log measurement, you can create a pseudo shear, that is pretty reliable. And that means, then, you can make mechanical properties calculations. In extreme cases, you can create pseudo acoustic, pseudo compressional, and shear data, if you know the reservoir pretty well. So, it's got a lot of applications in that respect. It's got a lot of applications in fluid substitutions. Here's an example. The yellow coloration is the differences between theoretical responses in the presence of gas or no gas. And that has big applications in seismic calibration, because from that kind of data, you can create a synthetic seismogram, assuming that everything's filled up with gas, or everything's filled up with water, and provide to the geophysical crowds for their seismic attributes analysis. Here is a comparison of Young's modulus with Poisson's ratio, as showing a distinction between ductile shales, carbonates and sands, which will be principally brittle, and then brittle shales. Here is a real example from one of the examples that we've got of ductile versus brittle, ductile in blue, brittle in red. This is now showing that in depth the blue where the arrow is, if you take your eye right across to the left-hand panel, that's the gray shale, and it's ductile. And the stuff on top of that is sand and is brittle. In the simplest case, you can argue that carbonate's simply brittle shales will be ductile, but that doesn't then distinguish between the potential of brittle shales. Useful, obviously, for the engineers for completion practices to know if you're fracking into a brittle rock where the ductile sequences may be to contain the growth of those factions.