Alameda-3, page-376

Yes, and AP explained finding heavy crude is common and expected in the uppersheet through Cuba long ago. The explanation was due to the effect of microbial action removing the light chains from the oil in the cooler shallow sections where the microbes are about to survive and do their thing.

As temperature increases as you go deeper, as shown in a depth/temperature chart shared by Flambeau in recent times, the likelihood of bacterial damage to lighter oils decreases as it becomes too hot for them.

The other effect of temperature is that as temperature increases it also lowers Viscosity allowing more viscous oils to flow better.

Alameda-3 revisiting the deeper higher pressure lower reservoirs Alameda and Marti I think will perform better due to higher pressure, higher temperature and likey a lighter oil spared from the microbial degradation in the ligher lower temperatures upper sheet.