Genetic Indicators for Natural Gases

Liu Wenhui; Xu Yongchang

Systematic classification for natural gases is not only a foundation for development of natural gas geological theory, but also very siginificant in exploration of natural gases. Based on a great deal of geological and geochemical data obtained from many years of academic research of our group and others, a new classification for natural gases was put forward under the guidence of "multi-source complex and multi-stage continuity". In this classification, natural gases were classified into the biogenic and abiogenic substantially,the biogenic natural gas was further divided into oil type gas and coal type gas according to its source organic matter.Natural gases were also classified dynamically as microbial gas, biothermo-catalytic transitional gas, thermo-catalytic decompositional gas, and high temperature decomposition gas. Different types of natural gases often show different geochemical behavoirs for the reason of variation in organic input, source rocks and thermal maturity. These geochemical properties provide indicators for classification of natural gases. The indicators include chemical compositional related ones: CH₄ Index,C₁ /C_1-5, C²⁺, C₂/C₃,and Hg abundance; isotopic compositional ones: δ¹³C₁, δ¹³C₂,δ¹³C₃,δ¹³C₄,⁴⁰Ar/³⁶ Ar; the companying liquid hydrocarbon indices:paraffin index,heptane index, alkane/aromatics index; and their internal relations.

Genetic Indicators for Natural Gases

State Key Laboratory of Gas Geochemistry. Lanzhno Institite of Geology, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 1994-12-05

Publish Date: 1996-03-10

Key words:

natural gas genetic classification /
multi-source complex and multi-stage Confinuity /
gas geochemistry indicator /
/
/

Abstract: Systematic classification for natural gases is not only a foundation for development of natural gas geological theory, but also very siginificant in exploration of natural gases. Based on a great deal of geological and geochemical data obtained from many years of academic research of our group and others, a new classification for natural gases was put forward under the guidence of "multi-source complex and multi-stage continuity". In this classification, natural gases were classified into the biogenic and abiogenic substantially,the biogenic natural gas was further divided into oil type gas and coal type gas according to its source organic matter.Natural gases were also classified dynamically as microbial gas, biothermo-catalytic transitional gas, thermo-catalytic decompositional gas, and high temperature decomposition gas. Different types of natural gases often show different geochemical behavoirs for the reason of variation in organic input, source rocks and thermal maturity. These geochemical properties provide indicators for classification of natural gases. The indicators include chemical compositional related ones: CH₄ Index,C₁ /C_1-5, C²⁺, C₂/C₃,and Hg abundance; isotopic compositional ones: δ¹³C₁, δ¹³C₂,δ¹³C₃,δ¹³C₄,⁴⁰Ar/³⁶ Ar; the companying liquid hydrocarbon indices:paraffin index,heptane index, alkane/aromatics index; and their internal relations.

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