张云鹏, 李玉宏, 卢进才, 李永红, 宋博, 郭望. 柴达木盆地北缘富氦天然气的发现——兼议成藏地质条件[J]. 地质通报, 2016, 35(2-3): 364-371.
    引用本文: 张云鹏, 李玉宏, 卢进才, 李永红, 宋博, 郭望. 柴达木盆地北缘富氦天然气的发现——兼议成藏地质条件[J]. 地质通报, 2016, 35(2-3): 364-371.
    ZHANG Yunpeng, LI Yuhong, LU Jincai, LI Yonghong, SONG Bo, GUO Wang. The discovery and origin of helium-rich gas on the northern margin of the Qaidam Basin[J]. Geological Bulletin of China, 2016, 35(2-3): 364-371.
    Citation: ZHANG Yunpeng, LI Yuhong, LU Jincai, LI Yonghong, SONG Bo, GUO Wang. The discovery and origin of helium-rich gas on the northern margin of the Qaidam Basin[J]. Geological Bulletin of China, 2016, 35(2-3): 364-371.

    柴达木盆地北缘富氦天然气的发现——兼议成藏地质条件

    The discovery and origin of helium-rich gas on the northern margin of the Qaidam Basin

    • 摘要: 在柴达木盆地北缘全吉山、团鱼山地区的煤炭钻孔和泥页岩解吸气中发现了体积分数较高的氦气显示。对2个地区的6件样品进行甲烷C同位素和He同位素分析, 其中2个样品的δ13C1值分别为-38.4‰和-39.9‰, 属于有机成因。4个样品的3He/4He同位素测试结果在0.03×10-6~1.3×10-6之间, 表明氦气来源以壳源氦为主, 个别样品有少量幔源氦加入。通过区域背景资料和物探资料分析认为, 柴北缘壳源成因的氦可能主要来源于基底富U、Th花岗岩体的放射性衰变, 而柴北缘的山前深大断裂则可为氦的运移提供良好通道。氦气产生后, 在垂向运移过程中结合其他烃类或非烃类气体, 在侏罗系、古近系-新近系良好的储盖条件下, 有可能形成独特的富氦天然气富集

       

      Abstract: In this paper, high-concentration helium was found for the first time in the coal drill hole and the mud-shale adsorbed gases in Quanjishan and Tuanyushan area on the northern margin of the Qaidam Basin. Six methane samples from these two areas were analyzed for carbon and helium isotopes. The data obtained show that two samples' carbon isotope values of methane are-38.4‰and-39.9‰, suggesting organic origin. In addition, the 3He/4He isotope values of four samples are between 0.03×10-6 and 1.3×10-6, showing that they were mainly crust-derived matter and subordinately mantle-derived matter. Through the analysis of regional geology and geophysical data, the authors have reached the conclusion that crust-derived helium was sourced from the granite with rich uranium and thorium on the basin basement. The deep faults of the northern Qaidam Basin might have provided better conditions for migration of the helium. Helium was produced in combination with other hydrocarbon or non-hydrocarbon gases in vertical migration process, and probably formed the unique helium-rich natural gas enrichment environment under the good reservoir and sealing condition in Jurassic, Neogene and Paleogene.

       

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