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The U.S. Geological Survey (USGS) completed an assessment of continuous (unconventional) shale-gas resources within the Karoo Province (fig. 1), a geologically complex region of approximately 608,000 square kilometers in South Africa and Lesotho. As much as 8 kilometers of Carboniferous to Jurassic sedimentary rocks are present in the Karoo Province (Smith and others, 1993). Organic-rich petroleum source rocks are present in Lower Permian Prince Albert, Collingham, and Whitehill Formations, and these rocks are thermally mature with respect to gas generation. Eighty oil and gas exploration wells were drilled in the Karoo Province between 1965 and 1977, with several reported gas shows but no conventional gas discoveries (IHS Energy, 2014).

Assessment of shale-gas resources of the Karoo Province, South Africa and Lesotho, Africa, 2016