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《Natural Gas Industry》 2007-04
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GENESIS OF NATURAL GAS IN YANMUXI OILFIELD,THE TURPAN-HAMI BASIN

GAO Gang,HUANG Zhi-long(China University of Petroleum·Beijing)  
Natural gas produced from Yanmuxi oilfield in the Turpan-Hami Basin shows some special characteristics,such as certain content of hydrogen sulfide,high content of nitrogen,low content of methane and relatively heavy carbon isotope of hydrocarbons in some samples,as well as inverse carbon isotope of heavy hydrocarbons.Study of these special characteristics is helpful for a thorough understanding of the source,genesis and distribution of gas in the Turpan-Hami Basin.A systematic analysis of the source and genesis of gas is performed based on the geochemical behaviors of gas and in combination with the geologic conditions and the following conclusions are obtained.① The dissolved gas in Yanmuxi oilfield is mainly distributed in the Shanshan Group and Cretaceous oil reservoirs,and belongs to humid gas composed of hydrocarbon and non-hydrocarbon gases.② The hydrocarbon gases mainly include methane and heavy hydrocarbons,which show the characteristics of wet gas,though their contents and drying coefficients change in wide ranges.③ The non-hydrocarbon gases are dominated by N2,H2S and CO2,in which the content of CO2 is generally low.④ The hydrocarbon gases,some of the non-hydrocarbon gases and the associated oil are mainly sourced from the Jurassic source rocks,some nitrogen with high content are sourced from the air,while the hydrogen sulfide is sourced from the deep Carboniferous marine carbonate.⑤ Some natural gas has experienced secondary change,and the relatively heavy carbon isotope of hydrocarbons and the inverse carbon isotope of heavy hydrocarbons are the results of biodegradation.
【CateGory Index】: P618.13
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