A single oil reservoir may contain oil, gas, and water together.
Not every oil well produces the same amount of oil.
All oil in the world is black.
Which one do you think is false?
1- ✅ TRUE — Petroleum reservoirs can contain multiple fluids separated according to their densities. In a typical mixed-fluid reservoir, gas occupies the upper part, oil lies beneath it, and formation water is found below the oil. These boundaries are known as gas-oil and oil-water contacts.
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2- ✅ TRUE — Production rates can vary significantly from one well to another, even within the same producing formation. Differences in reservoir pressure, porosity, permeability, thickness, completion design, and other geological and engineering factors can cause major differences in well productivity.
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3- ❌ FALSE — THE LIE. Crude oil is not always black. Its appearance can vary considerably depending on its composition and physical properties. Crude oil can appear in different colors, including yellowish, greenish, reddish, brown, and black.
What made it plausible: Crude oil is commonly shown as a thick black liquid in photographs, movies, and popular imagery, so it is easy to assume that all crude oil has the same color.
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