..had this to say about the Karoo Basin on their website:
"In South Africa, together with our partners, Statoil SA and Chesapeake Energy Corporation, we decided to not pursue shale gas exploration in the Karoo Basin owing to complex subsurface conditions and economic challenges."
http://www.sasol.com/about-sasol/international-energy-cluster/sasol-petroleum-international/operations-sasol-petroleum
jmo