New assessment out here https://pubs.er.usgs.gov/publication/fs20163038
From the download http://pubs.usgs.gov/fs/2016/3038/fs20163038.pdf
Undiscovered Resource Summary
The USGS quantitatively assessed undiscovered gas resources within two shale gas assessment units in the Karoo Province (table 2). For shalegas resources, the estimated mean totals for the Whitehill-Collingham Shale Gas AU are 16,993 billion cubic feet of gas (BCFG), with an F95–F5 range from 0 to 62,132 BCFG; 170 million barrels of natural gas liquids (MMBNGL), with an F95–F5 range from 0 to 632 MMBNGL. Estimated mean totals for the Prince Albert Shale Gas AU are 27,518 BCFG, with an F95–F5 range from 0 to 101,118 BCFG; 275 MMBNGL, with an F95–F5 range from 0 to 1,028 MMBNGL. The major source of geologic risk for shale-gas resources within the organic-rich shales of the Karoo Province is the retention of some portion of the generated gas within the source rock following any phases of gas migration.
2016 Assessment - USGS
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