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Primary energy (PE) is the energy found in nature that has not been subjected to any human engineered conversion process.It encompasses energy contained in raw fuels and other forms of energy, including waste, received as input to a system.
The chemical profiles, or crude oil assays, specify important properties such as the oil's API gravity. The delivery locations are usually sea ports close to the oil fields from which the crude was obtained (and new fields are constantly being explored), and the pricing is usually quoted based on FOB ( free on board , without consideration of ...
Petroleum products are materials derived from crude oil as it is processed in oil refineries. Unlike petrochemicals, which are a collection of well-defined usually pure organic compounds, petroleum products are complex mixtures. [1] Most petroleum is converted into petroleum products, which include several classes of fuels. [2]
Each crude oil has unique molecular characteristics which are revealed by the use of crude oil assay analysis in petroleum laboratories. [83] Barrels from an area in which the crude oil's molecular characteristics have been determined and the oil has been classified are used as pricing references throughout the world.
With the advent of the motor car, crude oil came into demand as a fuel. By 1911 petrol surpassed kerosene in sales as the fuel for most vehicles. [1] [2]: 48 Most petroleum consumed in Australia was imported but, between 1865 and 1952, various companies made a small proportion locally, from oil shale.
Theoretical oil production curve for a well with exponential decline. An individual oil well usually produces at its maximum rate at the start of its life; the production rate eventually declines to a point at which it no longer produces profitable amounts. The shape of the decline curve depends on the oil reservoir and the reservoir drive ...
The raw energy resources include for example coal, unprocessed oil & gas, uranium. In comparison, the refined forms of energy include for example refined oil that becomes fuel and electricity. Energy resources may be used in various different ways, depending on the specific resource (e.g. coal), and intended end use (industrial, residential, etc.).