Unlike the porous sandstone reservoirs found in many of the world’s oil fields, the Orinoco contains extra-heavy crude oil trapped within dense sandstones. The Geological Recipe for Giant Oil Fields The story begins in the distant past, during the Cretaceous period roughly 145 to 66 million years ago.
Understanding Venezuela's Onshore Oil Reserves in the Orinoco Belt
This specific geological configuration, sealed by impermeable rock layers, created the conditions for one of the world’s largest accumulations of recoverable hydrocarbons. From Surface Seeps to Global Giant Long before modern drilling technology, Venezuelans were aware of oil, noting natural seeps where the thick, black liquid oozed to the surface.
The presence of natural gas cap rock prevented the lighter elements from escaping. Looking Beyond the Barrel.
Understanding Venezuela's Easy Onshore Oil Reserves
The first commercial drilling in the early 20th century confirmed the scale of the resource, rapidly transforming the nation from an agricultural economy into a petro-state almost overnight. This thick, oxygen-poor environment prevented complete decomposition, allowing the matter to accumulate and gradually transform into a substance known as kerogen, locked within layers of sedimentary rock.
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