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FORMATION OF CRUDE OIL A JOURNEY THROUGH MILLIONS OF YEARS Crude oil was formed over millions of years when, in ancient times, tiny marine plants and animals (microorganisms) died and became buried under layers of sand and rock. Over time, with heat and pressure, the organic material transformed into oil. This oil then migrated through porous rocks and accumulated beneath hard, impermeable rock layers, eventually forming what we now extract as petroleum. Follow Geomark Seismics Survey and Drilli