Is interesting and GeoExpro publish some excellent articles. The...

Is interesting and GeoExpro publish some excellent articles. The original referred to in your post is here - Cryptic Seismic Clues: Hunting for another source rock in the South Atlantic

"The Aptian source rock is clearly identifiable in the seismic of the Orange Basin in Namibia as a soft topped unit with lower internal frequency, little internal structure, standing out in AVO space as a classic strong type IV anomaly."

"The Aptian source has proved so effective in Namibia with TotalEnergies’ Venus-1 discovery and Shell’s four up-slope discoveries, all charged from the Aptian source rock, potentially offering tens of billions of barrels of recoverable light oil."