>I don't think there are any "other properties" for Exxon in Hungary other than the Makó Trough.

That would put BrunerFan's concern to rest. However, I've read articles, which implies that Exxon and MOL are in co-operation in other basins.

Here's one from November:

http://www.privatbankar.hu/cikk/befektetes/megerosites_es_cafolat_igy_tervez_a_mol_33032

In connection with the non-traditional gas production in the Makó trough György Mosonyi said: the Canadian Falcon conducted its exploration in the Eastern half of the Basin, Mol only took part in the follow-up work at the company's request. Falcon’s drilling indeed was not really successful, but in the case of a non-conventional gas production experiment, it does not considered to be an unusual event.

He also added that MOL with its strategic partner Exxon is conducting explorations in the Western part of the Makó, Békés, and Derecske basins. The Hungarian company continues to be optimistic about the expected outcome. He does not draw far-reaching conclusions from the first results of Falcon, and the work continues as planned, and as in the past, shall continue carefully consider the outlook on its future. If it was not the case, it would be detrimental to his credibility.

Then again an earlier article in September seems to say otherwise:

http://www.gondola.hu/cikkek/67352

However, after having mentioned all the benefits, we should not ignore the fact that non-conventional extraction still has serious obstacles to contend with. Currently, the project consists of 6 drilled wells. And up to 3 additional drilling commences in 2011: The Földeák-1, which is Falcon’s, and another two that is Exxon-MOL’s. There is the Makó-West, where MOL and Exxon are working, in the Makó-East where the three companies jointly pursue the research. In the case of positive outcome of these drillings, MOL predicts the post-2012 production start; however the start-up volume is still in question. Also, it’s important to mention that in Békés and the Derecske basin MOL is the only operator, while in the Drava and Zala basins the Croatian INA begin a joint operation with MOL. This will also make the NETS (New Europe Transmission System); running under the Adriatic Sea, the Central and Eastern European systems, plans to combining the pipelines is prepared, to which production from the Makó would be linked.