As promised OG. Below is not directly from the Bray etal (1998)...

As promised OG. Below is not directly from the Bray etal (1998) paper, but there are a number of others that reference it and the image is exactly the same. I've overlayed the Calima block (PEL90) and PCL's PEL87 (along with Saturn). The Bray et al (1998) image was created pre-Moosehead-1, so you can see why the sentiment in PEL87 might have waned when that was dry and found to be immature/marginally mature. Anyway, point is, you can see that Calima had to extrapolate the map into their block (I've added Calima's image too for comparison). DId a good job it seems, but needs updating post Venus and Graff etc... . The Venus and Graff results will have shown that the PEL90 block is good in terms of maturity and no doubt a big reason for Chevron farming into that block.