It's a long story, however there is a snippet here pertaining to Exxon and Hungary.

Will Azerbaijani gas exports to China scuttle the Southern Corridor?

December 14, 2009

http://georgiandaily.com/index.php?option=com_content&task=view&id=16063&Itemid=132

Finally, while demand for natural gas in Europe is set to increase significantly in four to five years, Caspian decision-makers should not underestimate the market-changing force of unconventional gas development, for which there are serious prospects within the EU. It is telling, for example, that ExxonMobil has chosen to invest in unconventional gas development in Hungary, but has conspicuously ignored the Eurasian pipeline game. Unconventional gas development has already drastically altered the North American market, to the point that Liquefied Natural Gas (LNG) projects globally have already been reoriented toward the European and East Asian markets. In short, while it remains supremely important for European energy diversification, Caspian gas is no longer the only game in town.