Changes

==Solution-exsolution at different depths==

==Solution-exsolution at different depths==

A further limitation in oil–oil correlations exists when migrating gas dissolves part of a crude oil at depth (i.e., at high pressure) and exsolves a portion of its oil components at shallower depths (i.e., at reduced pressure). Because each component of petroleum is soluble to a different degree in [http://www.glossary.oilfield.slb.com/en/Terms/n/natural_gas.aspx natural gas], this solution-exsolution process can radically alter the oil composition and the appearance of gas chromatograms.

A further limitation in oil–oil correlations exists when migrating gas dissolves part of a [[crude oil]] at depth (i.e., at high pressure) and exsolves a portion of its oil components at shallower depths (i.e., at reduced pressure). Because each component of petroleum is soluble to a different degree in [http://www.glossary.oilfield.slb.com/en/Terms/n/natural_gas.aspx natural gas], this solution-exsolution process can radically alter the oil composition and the appearance of gas chromatograms.

==Biodegradation==

==Biodegradation==