This article is somewhat dated in that it was published last September, but you may find it of interest. Note- you may have to register free as an Oilbarrel website user in order to read the article in it's entirety. The registration process takes all of a minute to do, and won't cost you a dime:

Article title- "Chevron's Involvement In Offshore Liberia Could All Go Well for Simba Energy's Onshore Acreage

link http://www.oilbarrel.com/nc/news/display_news/article/chevrons-involvement-in-offshore-liberia-could-all-go-well-for-simba-energys-onshore-acreage/856.html?tx_ttr