Recollecting the Thoughts of Marlan Downey:
What characteristics define a great source rock?
With regard to source rock candidates,
Was 1000 feet of 1 percent organic matter as good as 100 feet of 10 percent organic matter?
Good source rocks needed to have very significant richness, of a particular kind of organic matter, heated in the earth for a known time and temperature. The generation process was governed by the Arrhenius equation: time, temperature and type of organic matter are variables. And, hydrogen-rich organic matter was needed to create oil, and humic, hydrogen-deficient organic material could only produce gas.
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