In 2000 Forest Oil International shot a 312 km2 3-D seismic survey in South Africa's Block 2A around a well that, despite testing 53 million ft3/d gas and 342 bbls condensate/d gas, had been abandoned in 1986 (Figure 1). This well (AK-1) was thought to have tested a small noncommercial structural trap. The 3-D showed that the field, now designated Ibhubesi Field, is in fact a giant regional stratigraphic trap. The 3-D survey might only cover a small part of the southern extent of the field, which may eventually produce 15 trillion ft3 of...

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