THE CHEMICAL COMPOSITIONS OF VOLATILES IN UPPER MANTLE AND THEIR IMPLICATION FOR HYDROCARBON GENERATION
Received date: 2005-12-08
Revised date: 2005-12-30
Online published: 2006-02-20
Mantle fluids in supercritical state possess high dissolving and diffusing capac ity, which are the important transporting carrier of energy in earth interior, t heir chemical compositions vary in a large range with the evolution processes of mantle, and can be distinguished as the primitive fluid in upper mantle, the fl uid of mantle metasomatism and etc. The chemical composition of primitive fluid in upper mantle are related to the mantle reservoir, the primitive fluid in uppe r mantle with a primitive mantle-like reservoir is dominated by CO with seconda ry amounts of CO2 and H2; a depleted mantle reservoir shows a dominant CO2 with minor amounts of CO and H2 in primitive fluid in upper mantle, and an en riched mantle reservoir is enriched in H2. Meanwhile the fluids of mantle meta somatism were mixed by the recycled crustal fluid components beneath eastern Chi na. Mantle fluids have preserved a certain amount light hydrocarbon, such as CH4, C2H6 etc. and high weight hydrocarbon, including an amount of primordia l hydrocarbon, moreover, mantle fluid enriched in H-2 and heat can provide the ample hydrogen and heat sources in hydrocarbon generation of kerogen and promote source rocks to expel hydrocarbons and migration.
ZHANG Ming-jie; WANG Xian-bin;HU Pei-qing; ZHANG Yu;YE Xian-ren;LI Li-wu . THE CHEMICAL COMPOSITIONS OF VOLATILES IN UPPER MANTLE AND THEIR IMPLICATION FOR HYDROCARBON GENERATION[J]. Natural Gas Geoscience, 2006 , 17(1) : 31 -35 . DOI: 10.11764/j.issn.1672-1926.2006.01.31
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