King... Based on a portion of the article posted recently, i think CPC has 100% of the block but Chad gets 30% of any production. See below.
"The CPC said the quality of the oil found in Chad is superior to that of Brent crude. Based on the current world oil price of US$90 a barrel, the well Penoy-1 has an output worth US$9 billion. After the deduction of 30% production rights for the Chad government, the CPC stands to gain US$1.6 billion in net profits."