The way I see, GOG get shares in a producing company and someone...

The way I see, GOG get shares in a producing company and someone to help them drill their exciting tenements.
DLS get a host of new tenements, which have proven very prospective, especially for gas.

They both benefit from larger size and easier access to finance...eg. they might be able to commercialise some of those gas tenements
http://www.asx.com.au/asx/statistics/getAnnPdf('/asx/statistics/showAnnouncementPDF.do?idsID=',%20'00595350',%20'Announcement');return%20false;