- [Instructor] So now let's talk about developing a basin wide petrophysics model. The Williston Basin, as it turns out, it covers roughly about 150,000 square miles. And throughout this whole section there've been several thousand wells that have been drilled into the Bakken Petroleum System. So, taking our Log Data Availability that we have throughout the basin, it's numerous service companies over several generations. The discovery logs well was made in 1955 by Amerada Hess. And so, throughout all those generations, there's been a varying vintage of logging tool technologies that have been used in the Bakken Petroleum System. So these data wells that we have that represent our advanced logging suites and cores, they're really a sparse subset of the total wells in the basin. So in developing our basin-wide models we know that we have to use minimum number of logs, such as maybe a triple combo or a quad combo. But we can use these data wells to help us calibrate the model. And this model is currently in development. In comparing the advanced petrophysics model to the basin wide model where we're using minimal logs, the advanced logs like in our probabilistic mineral model we can calculate 14 minerals quite easily. But in the probabilistic interpretation using the mineral logs we can calculate six minerals realistically. And so, we have different varying ways that we can do the thin bed analysis and we can't really do that with the model, with the deep resistivity that we have for the older logging. And so, from this we're going to have to use a bench mark with this advanced data to develop this basin wide petrophysics model.