摘要
采用气-水平衡法及同位素分馏平衡方程技术标定工作标准气,测定样品的氢同位素比值,使误差控制在5‰以内.采取川东北、鄂西和川西三个地区的天然气样品,分别测定它们的单体烃氢同位素比值.分析表明,川东北普光气田海相成因天然气甲烷氢同位素δD平均值为-126‰(SWOM),比新疆塔河油田海相环境生成的天然气甲烷氢同位素δD平均值-164‰重约40‰.对比研究认为,这与其共存地层水的δD值密切相关,也与这些天然气的成熟度有直接关系.
Abstract
The analysis samples of natural methane gas were collected from three gas field areas of marine sedimentary environments， i. e. from the northeast and west parts of Sichuan Province and the west part of Hubei Province. Ratios of hydrogen isotope composition of Individual hydrocarbon are determined and compared with each other under the control of the error less than 5‰ with the standard gas by a gas-water equilibrium method. An analysis result is worthy to pay attention that the hydrogen isotope in methane from Puguang Gas Field in the northeast part of Sichuan has an average δD value of -126‰(SWOM), which is about 40‰ heavier than that of -164‰（SWOM）of the hydrogen isotope in methane available from Tahe Oil Field in Tarim Basin. This phenomenon is deemed to be closely relative with the δD value of coexisting formation water and also directly associated with the maturity of natural methane gas.
关键词
气-水平衡法,海相成因,甲烷,地层水,氢同位素,同位素法,四川东北
Key words
Gas-water equilibrium method; Marine Origin; Methane; Formation water; Hydrogen isotope; Isotope determination; Northeastern Sichuan
川东北天然气单体烃氢同位素组成特征[J]. 海相油气地质. 2008, 13(2): 17-21
Feature of Hydrogen Isotope Composition of Individual Hydrocarbon in Natural Methane Gas from Northeast Part of Sichuan[J]. Marine Origin Petroleum Geology. 2008, 13(2): 17-21
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