Everything about Natural Gas Field totally explained
Oil and
natural gas are produced by the same geological process:
anaerobic decay of
organic matter deep under the Earth's surface. As a consequence, oil and natural gas are often found together. In common usage, deposits rich in oil are known as
oil fields, and deposits rich in natural gas are called
natural gas fields.
In general, organic sediments buried in depths of 1,000
m to 6,000 m (at temperatures of 60 °
C to 150 °C) generate oil, while sediments buried deeper and at higher temperatures generate natural gas. The deeper the source, the "drier" the gas (that is, the smaller the proportion of
condensates in the gas). Because both oil and natural gas are lighter than water, they tend to rise from their sources until they either seep to the surface or are trapped by a non-permeable layer of rock. They can be extracted from the trap by drilling.
The largest natural gas field is South Pars/
Asalouyeh gas field, which is shared between
Iran and
Qatar. The second largest natural gas field is located in
Novy Urengoy,
Russia.
Offshore gas fields
Like oil, natural gas is often found underwater in offshore gas fields such as the
North Sea,
Corrib Gas Field off
Ireland, and the
Scotian Shelf near
Sable Island. The technology utilized to extract and transport offshore natural gas is different from land-based fields in that a few, very large, rigs are usually used, due to the cost and logistical difficulties in working over water.
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