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The generation of natural gases involves several stages and the various stages are of continuous transition. This is another feature of natural gas generation. The term “multi-stage” is relative mainly to oil-generating threshold value and liquid window. The evolution of organic matter is affected by different epigene agencies and natural gases differing in geochemical properties such as biogenic gas (bacterial gas), thermocatalytic gas and pyrolytic gas could be produced at different stages of the evolution of organic matter. The proposal of bio-thermocatalytic transitional-zone gas presents a pattern of mutual linking and continuous transition of natural gases originated at different stages.In the genetic classification of natural gases, the nomenclature of a certain gas is based mainly on the epigene agency which is responsible for its formation, for example, biogenic gas, pyrolytic gas. That is the “nomenclature by the main stage” described in this study. On account of the continuity of gas generati
The generation of natural gases involves several stages and the various stages are of continuous transition. This is another feature of natural gas generation. The term “multi-stage ” is relative mainly to oil-generating threshold value and liquid window. The evolution of organic matter is affected by different epigene agencies and natural gases differing in geochemical properties such as biogenic gas (bacterial gas), thermocatalytic gas and pyrolytic gas could be produced at different stages of the evolution of organic matter. The proposal of bio-thermocatalytic transitional -zone gas presents a pattern of mutual linking and continuous transition of natural gases originated at different stages. In the genetic classification of natural gases, the nomenclature of a certain gas is based mainly on the epigene agency which is responsible for its formation, for example That is the “nomenclature by the main stage ” described in this study. On account of the cont inuity of gas generati