You're not going to find a good pair for crude. Use pairstradinglab.com to search for pairs based on cointegration, R squared, etc. Given searching for pairs based on a certain stat isn't extremely relevant in industry, for a thesis, you can find a few good ones.
With that said, do some work on using neural nets to predict share price/value (whatever angle you wish to take) based on earnings reports. Hint: use R, there is already a couple of good nnet packages available. From my expirence, academics like the use of neural nets if you can back up your model.
Good luck!