Why no action in Sudan?

I ran across this financial times article today. 

http://news.ft.com/cms/s/827e63a0-cae5-11da-9015-0000779e2340.html
What's the connection between Sudan and Chad, you say?  Well, not much unless you first understand that Chad is an oil rich country and is under attack by rebels.  Now, rebel attacks in Africa isn't news nowadays, but what IS news is that the Chad president, Deby, claims the Sudanese government is funding the rebels.  Now, hmmm, the west turns a blind eye towards the atrocities in Sudan, whlie the Sudanese goverment destabilizes Chad, and oil rich country. What's the connection?  Hard to tell, but it sure seems like someone is out to gain control of Chad's oil supply, and it isn't Sudan that will get to keep it.