THE HYDROGEN ISOTOPIC COMPOSITION OF NATURAL GASES GENERATED FROM DIFFERENT PATHWAY
THE HYDROGEN ISOTOPIC COMPOSITION OF NATURAL GASES GENERATED FROM DIFFERENT PATHWAY
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作者：
W. Xiao
The hydrogen isotopic composition of biogenic methane is closely related to the methanogenesis pathway and hydrogen isotopic composition of the coexisting water.Different scholars put forward different linear relational expression of δD_(CH_4) and δD_(H_2O).Whiticar etc.(1986) put forward linear relational expression δD_(CH_4)=δD_(H_2O)-180‰ for carbonate reduction pathway and δD_(CH_4)=0.25δD_(H_2O)-321‰ for acetate fermentation pathway.The application of these two relational expressions is the most extensive.Biogenic gases resources of our country are abundant.The hydrogen isotope research of different kinds of biogenic gases can offer important scientific information for exploration and development of gas resources.The hydrogen isotopic composition of thermal generation gases is influenced by the environment and maturity of the source rock mainly.The combination of carbon and hydrogen isotopic composition can offer a more message about generation and reservoir.More and more scholars focus on the study of the role of water in oil/gas generation.The research is comparatively weak in hydrogen isotope of inorganic gas.Generally speaking,δD_(CH_4) of inorganic gases is relatively weight than organic gases.The progress of the analytical technology of hydrogen isotope is one of the driving force of promoting the hydrogen isotope research.New analytic technology(GC/TC/IRMS) realizes analyzing online,and have improved the precision of the hydrogen isotope analyses,bring new opportunity and challenge to research of the hydrogen isotope of natural gases.
