The Abyssal Abiogenic Theory led to discoveries of oil in which rock type?

• A. Non-sedimentary, Crystalline Basement Rock
• B. Sedimentary Rock Formations
• C. Igneous Intrusions
• D. Metamorphic Rocks

Answer: (A)

Abiogenic hydrocarbon formation in deep Earth means hydrocarbons can originate without any organic material and migrate into deep crustal rocks. If oil is found in non-sedimentary, crystalline basement rocks, that fits this idea because those rocks lie in the deep crust rather than in the sedimentary basins where oil from ancient organic matter is typically trapped. Sedimentary rock formations are the classic reservoirs for petroleum produced from decayed organisms, so finding oil in basement rocks points toward the abiogenic possibility. Igneous intrusions or metamorphic rocks aren’t the primary environments expected for abiogenic petroleum in this context, whereas crystalline basement rocks are the type associated with deep-Earth hydrocarbon formation in this theory.