Doing an in-situ calculation like this and then applying...

Doing an in-situ calculation like this and then applying directly to share price is not only not a good way to value companies but it shows a great lack of understanding of the metrics of cost and recovery.

This oil field (Fractured Cretaceous Pierre Shale) has not produced that MUCH oil in its entire history, it's only produced 1/6th of that, despite being drilled for a long time. Everything in your post except the oil price was pretty much just a huge, unfounded guess.

you can read about all the formations here:

https://pubs.usgs.gov/dds/dds-069/dds-069-p/REPORTS/69_P_CH_2.pdf