When these organisms died, their remains settled on the sea floor, mixing with sediments and becoming buried under layers of rock. Finally, impermeable salt layers, which were originally laid down as evaporites, act as an effective seal, trapping the buoyant oil and gas beneath them for millions of years.
The Ancient Tethys Sea and Geological Lottery Behind the Middle East's Oil Riches
The Geological Lottery of the Ancient Tethys Sea During the Mesozoic Era, roughly 250 to 66 million years ago, the landmasses we recognize today were arranged differently, with the supercontinent Pangaea breaking apart. The black shales deposited in the anoxic depths of the Tethys Sea act as source rocks, generating oil and gas.
The naval arms race between European powers highlighted the strategic necessity of oil for military dominance. The concentration of the world's readily accessible oil reserves in the Middle East is not a random geological accident but the result of a unique convergence of ancient history, specific geology, and modern geopolitics.
The Ancient Tethys Sea and Geological Lottery Behind Middle East Oil Riches
This stability allowed the oil reservoirs to remain undisturbed, preserving vast pools of light, sweet crude that are easier and cheaper to extract compared to heavy or sour crude found elsewhere. Below, porous limestone formations like the Arab-D Formation serve as reservoir rocks, allowing the hydrocarbons to accumulate.
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