Geochemical Characteristics of Hydrogen Isotopic compositions of Natural Gas, oil and Kerogen

Wang WanChun

In this paper the hydrogen isotope compositions of methane, crude as well as light oils and kerogen and their relationship with the depositional environments and the maturity of source rocks were discussed in detail. The hydrogen isotope compositions of methane are mainly related to depositional environments of source rocks. Methane of terrestrial fresh water environments has lighter hydrogen isotope compositions, and that of brackish to salt water environments has heavier hydrogen isotope compositions. Simultaneously, the hydrogen isotope compositions of methane are also related to the maturity of source rocks, i. e., with the increasing maturity of source rocks, the δD of methane becomes heavier. When using the δD of methane to differentiate depositional environments of source rocks, the effect of the maturity of source rocks on the δD of methane should be considered. The hydrogen isotope compositions of crude and light oils are mainly related to depositional environments of source rocks. Oils derived in fresh water environments have lighter δD, and those in brackish to salt water environments have heavier δD. The hydrogen isotope compositions of kerogen are also controlled by depositional environments, i. e., kerogens derived from fresh water environments have lighter δD,and those from brackish to salt water environments have heavier δD.

Lanzhou Institute of Geology, Chinese Academy of audiences, Lanzhou 730000

Received Date: 1995-12-01

Publish Date: 1996-12-31

Key words:

natural gas /
oil /
kerogen /
hydrogen isotope

Abstract: In this paper the hydrogen isotope compositions of methane, crude as well as light oils and kerogen and their relationship with the depositional environments and the maturity of source rocks were discussed in detail. The hydrogen isotope compositions of methane are mainly related to depositional environments of source rocks. Methane of terrestrial fresh water environments has lighter hydrogen isotope compositions, and that of brackish to salt water environments has heavier hydrogen isotope compositions. Simultaneously, the hydrogen isotope compositions of methane are also related to the maturity of source rocks, i. e., with the increasing maturity of source rocks, the δD of methane becomes heavier. When using the δD of methane to differentiate depositional environments of source rocks, the effect of the maturity of source rocks on the δD of methane should be considered. The hydrogen isotope compositions of crude and light oils are mainly related to depositional environments of source rocks. Oils derived in fresh water environments have lighter δD, and those in brackish to salt water environments have heavier δD. The hydrogen isotope compositions of kerogen are also controlled by depositional environments, i. e., kerogens derived from fresh water environments have lighter δD,and those from brackish to salt water environments have heavier δD.

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Geochemical Characteristics of Hydrogen Isotopic compositions of Natural Gas, oil and Kerogen

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