Hi there!@Dknow, thanks for sharing!I just found this long...

Hi there!

@Dknow, thanks for sharing!

I just found this long article (haven't read it all):

Interpretation of Subsurface Hydrocarbon Shows ( Schowalter, Hess 1999)

Maybe there are some answers to your question inside. From the introduction:
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Interpretation of subsurface hydrocarbon shows can be approached in three logical steps. The first step is to determine the physical mode of occurrence of the hydrocarbons encountered when drilling an exploratory well. Hydrocarbons in the subsurface can occur in four distinct physical modes: (1) continuous phase oil or gas, (2) isolated droplets of oil or gas, (3) molecular-scale dissolved hydrocarbons, or (4) associated with oil or gas source rocks. The significance of these modes of occurrence is that only continuous phase oil or gas is potentially producible by conventional petroleum production techniques. The three other modes of occurrence cannot produce oil or gas economically, but are often identified as "shows."
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So maybe they didn't look for oil/ gas shows on the droplets or molecular-scale level back in 1982 (no money, no technical equippment, no motivation to do so), but did it during their re-analysis nowadays, to better understand what they are looking on.

Just my 50 (Euro)Cents...

Cheers and have a good day,
Neo