| 吐鲁番-哈密盆地台北凹天然气的地球化学特征及其来源 |
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| 引用本文： | 龙道江,杜建国.吐鲁番-哈密盆地台北凹天然气的地球化学特征及其来源[J].沉积学报,1993,11(4):42-46. |
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| 作者姓名： | 龙道江 杜建国 |
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| 作者单位： | 1.吐哈石油勘探指挥部, 新疆鄯善 838202; |
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| 摘 要： | 本文在论述新疆维吾尔自治区东部吐鲁番-哈密盆地台北凹陷天然气地质与地球化学特征的基础上,讨论了天然气的来源,对采自吐哈盆地十余个天然气样进行了气体组分和碳、氢、氦同位素分析。天然气甲烷含量为60.85～84.40%,干湿指数（C1/C+2）为1.57～6.37,属湿气.甲烷碳氢同位素组成(δ13C1、δD)分别为-43.0～-49.4‰和-220～-281‰.乙烷的δ13C2-20.1～-34 0‰,δD:-259～-257‰。丙烷的δ13C3-21.3～-26.7‰,δD:-114～-203‰。丁烷的δ13C4-22.2～-28.2‰,δD:-93～-116‰。天然气中氦的同位素组成（He/He）为（3.17～7.01）×10.目前主要产层属侏罗系,天然气一般与轻质油同藏,侏罗系中于酪根类型主要为Ⅲ型,R。值为0.4～1.0%。地质地球化学资料表明台北凹陷天然气与来自侏罗系的轻质油可能不完全同源,相当一部分天然气也许来自古生界。天然气中的氦为地壳来源的氦。
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| 关 键 词： | 吐哈盆地 天然气 同位素地球化学 |
Orign and Characteristics of Natural Gas in Taibei Seg of Turpan - Kami Basin |
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| Institution: | 1.Turpan -Hami Bureau of Oil exploration and Development, Sansan County 838202, Xinjiang Uygur Autoomous Region, P.R.China;2.Lanzhou Institute of Geology. Chinese Academy of Sciences, Lanzhou 730000, P. R.China |
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| Abstract: | Origin of gaseous hydrocarbon is discussed on the basis of geochemical characteristics of natural gas in Taibei depression of the Turpan -Hami Basin, Northwestern China. More than 10 gas samples were collected from the production wells. Molecular composition and carbon, hydrogen and helium isotope composition of natural gas were analyzed. The gases contain 60. 85 - 84. 40% mathane and 13. 04-38. 76% heavy hydrocarbons (Cu2+). Values of wetness (C1/C2+) are between 1. 57 to 6. 37. The gases are isotopically characterized by δ18C1 = -43. 0～-49. 4‰, δDc1 = - 220～-271‰, δ18C2 = -20.1～-34. 0‰. δDc2= -259～-257‰. δ18C3= -21.3～-26. 7‰, δDc3= -114～-203‰, δ18C4= -22. 2～-28. 2‰, δDc4 =-93～-116‰, and 3He/4He = (3. 17-7. 01)×10-6. Estimated maturity of natural gas is different from that of Jurassic sediment organic matter. Based on the carbon isotope composition of mathane, ethane and propane, values of vit-rinite reflectance (R.) are calculated. The data indicate that natural gas in Taibei depression of the Tuipan -Hami Basin is wet gas, and belongs to thermocatalytical natural gas, that the gases may be generated in different stages, which causes the gases have larger △13C2-1 values, and that the gases may be partially derived from Jurassic System, and partially from Pre - jurassic strata. |
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