This oil block map from the Chad Ministere du Petrole may clear up the mystery of where Chari Ouest Block III is. It shows different names for some blocks, which I would lend more credence to than the Korean map.
There is a square-ish block to the east and adjacent to the brown block (BDS-2008), that looks to have the label "Chari Ouest Block III". This block is labeled "Permit H" by the Korean map. This is right above the current oil-bearing fields.
There is also what looks to be a "Chari Sud Block II", which is the same as the southern-most Korean Chari block. The northern-most Chari block on the Korean map is named here "Lac Chad Block 1". The Korean map seems to be clearly in error, since the block is right along Lake Chad and nowhere near the Chari River.
The letters below each block label seem to indicate the licensee of the block, e.g., ESSO, CNPC, etc. (but the resolution of this map is not good, so it is hard to tell). If this is the case, then this map shows Chari Ouest Block III as belonging to CNPC. But since this map is current as of August 2008, part of the block could have been relinquished since then.
If someone can find a better version, that would be welcome.
In any case, we do have agreement between the two maps on the location of the Manga and BDS-2008 blocks, which this latest map does show as not being licensed. - LT
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