Petroleum Geology is the study of origin, occurrence, movement, accumulation, and exploration of hydrocarbon fuels. It refers to the specific set of geological disciplines that are applied to the search for hydrocarbons (oil exploration).
Dear Dr El Nady,
Organic Geochemistry in a simple sense is the study of the chemical components of any organic materials that might have decomposed under certain geological conditions/processes to become hydrocarbons (gas, condensate or oil).
Petroleum Geology again in a simple sense is a Geological Setting (usually basins) on a regional scale where it is most likely to generate & accumulate hydrocarbons. There are at least some critical geological factors (source, maturity, migration, reservoir, seal, trap) that one has to asses for any basins if they worth prospecting for.
Both Petroleum Geology & Organic Geochemistry go hand-in-hand if you want to understand the whole petroleum system of a basin.
Regards
shadrach
Organic geochemistry studies the organic components of petroleum and tell us which materials are in petroleum but petroleum geology describe the structure and environment that petroleum is produced, accumulate and trap in it.
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