A Discussion of Formation Mechanism and Its Significance of Characteristics of Chemical Composition and Isotope of Water-dissolved Gas in Turpan-Hami Basin

ZHANG Xiao bao; XU Yong-chang; LIU Wen hui; SHEN Ping; JI Li ming; MA Li yuan

The chemical composition and carbon isotope of the six water-dissolved gas samples in the Turpan- Ha-mi basin are measured and the characteristic of formation mechanism and the possibility of application of the com-position and isotope to natural gas geology are discussed by comparison with the natural gas in the basin. The char-acteristic of the composition of the water-dissolved gas hydrocarbons is mainly controlled by dissolution degree of the hydrocarbons. They are derived from the same source rocks as the natural gases, but they are different from the natural gases, e. g., the C ₁/C _{1 ～ 5}of the water-dissolved gas should be higher than that of the natural gas, but in fact it is lower; the homologue of the water-dissolved gas CH ₄ is enriched in¹³C than that of the natural gas. the above characteristic was thought to be related with that the dissolved content of the natural gases in the dis-solved-water was less than the migrated content. It is considered that the differences of the composition and isotope between the water-dissolved gas and the natural gasindicate the relation of between the sampling membersand nat-ural gas dynamics pool-forming system.

State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 2002-01-14

Rev Recd Date: 2002-03-17

Key words:

Abstract: The chemical composition and carbon isotope of the six water-dissolved gas samples in the Turpan- Ha-mi basin are measured and the characteristic of formation mechanism and the possibility of application of the com-position and isotope to natural gas geology are discussed by comparison with the natural gas in the basin. The char-acteristic of the composition of the water-dissolved gas hydrocarbons is mainly controlled by dissolution degree of the hydrocarbons. They are derived from the same source rocks as the natural gases, but they are different from the natural gases, e. g., the C ₁/C _{1 ～ 5}of the water-dissolved gas should be higher than that of the natural gas, but in fact it is lower; the homologue of the water-dissolved gas CH ₄ is enriched in¹³C than that of the natural gas. the above characteristic was thought to be related with that the dissolved content of the natural gases in the dis-solved-water was less than the migrated content. It is considered that the differences of the composition and isotope between the water-dissolved gas and the natural gasindicate the relation of between the sampling membersand nat-ural gas dynamics pool-forming system.

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A Discussion of Formation Mechanism and Its Significance of Characteristics of Chemical Composition and Isotope of Water-dissolved Gas in Turpan-Hami Basin

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