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Volume 46 Issue 3
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(3): 576-589
LI Wei, CHEN Jianfa, WANG Jie, WANG Xiaobo, HE Daxiang, WANG Dongliang, LIU Kaixuan, YOU Bing, CHEN Cong, FU Rao, TANG Shuaiqi, ZHANG Jiaqi. Geochemical characteristics and geological significance of noble gases in natural gas from Songliao Basin, China[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 576-589. doi: 10.11781/sysydz202403576
Citation: LI Wei, CHEN Jianfa, WANG Jie, WANG Xiaobo, HE Daxiang, WANG Dongliang, LIU Kaixuan, YOU Bing, CHEN Cong, FU Rao, TANG Shuaiqi, ZHANG Jiaqi. Geochemical characteristics and geological significance of noble gases in natural gas from Songliao Basin, China[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 576-589. doi: 10.11781/sysydz202403576
shu

Geochemical characteristics and geological significance of noble gases in natural gas from Songliao Basin, China

doi: 10.11781/sysydz202403576
  • 1.

    National Key Laboratory of Petroleum Resources and Engineering, College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China

  • 2.

    School of Resources and Environmental Engineering, Tianshui Normal University, Tianshui, Gansu 741000, China

  • 3.

    Wuxi Research Institute of Petroleum Geology, SNOPEC, Wuxi, Jiangsu 214126, China

  • 4.

    Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100089, China

  • 5.

    Hubei Key Laboratory of Oil & Gas Geochemistry and Environment, Yangtze University, Wuhan, Hubei 430100, China

  • Received Date: 2023-11-05
  • Rev Recd Date: 2024-03-18
  • Publish Date: 2024-05-28
    Abstract
  • Geochemistry of noble gases has been applied to the study of deep Earth materials and celestial meteorites. With advancements in measurement technology, it is also increasingly being used in natural gas research. Using the most advanced noble gas mass spectrometer, a systematic analysis was conducted on the abundance and isotopes of noble gas samples collected from the middle and deep Songliao Basin in eastern China to elucidate the compositional characteristics of noble gases in a faulted basin. The findings reveal that the abundance of noble gases in natural gas decreases from light noble gases to heavy noble gases in a left-to-right reversed L-shaped pattern. Specifically, the isotopic ratios of noble gases are: 3He/4He at 2.64×10-6, 20Ne/22Ne at 9.94, 21Ne/22Ne at 0.029 22, and 40Ar/36Ar at 743.7, all of which are higher than atmospheric values. The isotopes 80Kr, 84Kr, 86Kr, and 131-136Xe show relative excess compared to atmospheric levels, indicating the mixing of mantle-derived gases in the natural gas. Based on the compositional characteristics of noble gases, this study suggests that the natural gas in the middle and deep Songliao Basin originated from inorganic crust and mantle mixing. Additionally, certain differences exist in the contribution of mantle-derived components across different tectonic blocks and categories of natural gas within the basin. Comparison between noble gas compositions and the types of natural gas demonstrates that light noble gases distinguish effectively between different types of natural gas, whereas the composition of heavy noble gases shows no significant differences among various types of natural gas. Noble gas isotopes, in addition to tracing the source of natural gas, can also be used to determine natural gas genesis, distinguish natural gas types and characterize tectonic settings.

     

    • All authors disclose no relevant conflict of interests.
    The study was designed by LI Wei and CHEN Jianfa. The experimental operation was completed by LI Wei, WANG Xiaobo, HE Daxiang and LIU Kaixuan. The manuscript was drafted and revised by LI Wei, CHEN Jianfa, WANG Jie, WANG Dongliang, YOU Bing, CHEN Cong, FU Rao, TANG Shuaiqi and ZHANG Jiaqi. All authors have read the last version of the paper and consented to its submission.
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    • References(53)
  • [1]
    TOLSTIKHIN I, KAMENSKY I, TARAKANOV S, et al. Noble gas isotope sites and mobility in mafic rocks and olivine[J]. Geochimica et Cosmochimica Acta, 2010, 74(4): 1436-1447. doi: 10.1016/j.gca.2009.11.001
    [2]
    PINTI D L, MARTY B. Noble gases in crude oils from the Paris Basin, France: implications for the origin of fluids and constraints on oil-water-gas interactions[J]. Geochimica et Cosmochimica Acta, 1995, 59(16): 3389-3404. doi: 10.1016/0016-7037(95)00213-J
    [3]
    BALLENTINE C J, O'NIONS R K, OXBURGH E R, et al. Rare gas constraints on hydrocarbon accumulation, crustal degassing and groundwater flow in the Pannonian Basin[J]. Earth and Planetary Science Letters, 1991, 105(1/3): 229-246.
    [4]
    陈践发, 刘凯旋, 董勍伟, 等. 天然气中氦资源研究现状及我国氦资源前景[J]. 天然气地球科学, 2021, 32(10): 1436-1449. doi: 10.11764/j.issn.1672-1926.2021.08.006

    CHEN Jianfa, LIU Kaixuan, DONG Qingwei, et al. Research status of helium resources in natural gas and prospects of helium resources in China[J]. Natural Gas Geoscience, 2021, 32(10): 1436-1449. doi: 10.11764/j.issn.1672-1926.2021.08.006
    [5]
    尤兵, 陈践发, 肖洪, 等. 富氦天然气藏氦源岩特征及关键评价参数[J]. 天然气工业, 2022, 42(11): 141-154. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG202211014.htm

    YOU Bing, CHEN Jianfa, XIAO Hong, et al. Characteristics and key evaluation parameters of helium source rocks in helium-rich natural gas reservoirs[J]. Natural Gas Industry, 2022, 42(11): 141-154. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG202211014.htm
    [6]
    QIN Shengfei, XU Dan, LI Jiyuan, et al. Genetic types, distribution patterns and enrichment mechanisms of helium in China's petroliferous basins[J]. Frontiers in Earth Science, 2022, 10: 675109. doi: 10.3389/feart.2022.675109
    [7]
    OZIMA M, PODOSEK F A. Noble gas geochemistry[M]. Cambridge: Cambridge University Press, 1983.
    [8]
    MANYRIN B A, TOLSTIKHIN I N. Helium isotopes in nature[M]. Amsterdam: Elsevier, 1984: 175-179.
    [9]
    LUPTON J E. Terrestrial inert gases: isotope tracer studies and clues to primordial components in the mantle[J]. Annual Review of Earth and Planetary Sciences, 1983, 11: 371-414. doi: 10.1146/annurev.ea.11.050183.002103
    [10]
    WAKITA H, SANO Y. 3He/4He ratios in CH4-rich natural gases suggest magmatic origin[J]. Nature, 1983, 305(5937): 792-794. doi: 10.1038/305792a0
    [11]
    LOLLAr B S, O'NIONS R K, BALLENTINE C J. Helium and neon isotope systematics in carbon dioxide-rich and hydrocarbon-rich gas reservoirs[J]. Geochimica et Cosmochimica Acta, 1994, 58(23): 5279-5290. doi: 10.1016/0016-7037(94)90311-5
    [12]
    BALLENTINE C J, O'NIONS R K, COLEMAN M L. A Magnus opus: helium, neon, and argon isotopes in a North Sea oilfield[J]. Geochimica et Cosmochimica Acta, 1996, 60(5): 831-849. doi: 10.1016/0016-7037(95)00439-4
    [13]
    HE Daxiang, CHEN Jianfa, ZHANG Chen, et al. Compositions of non-hydrocarbon and noble gases in natural gas samples from Tarim Basin, China[J]. Geochemical Journal, 2015, 49(3): 271-282. doi: 10.2343/geochemj.2.0355
    [14]
    XU Yongchang, SHENG Ping, TAO Mingxin, et al. Distribution of the helium isotopes in natural gases from oil-gas-bearing basins in China[J]. Chinese Science Bulletin, 1994, 39(22): 1905-1911.
    [15]
    LIU Wenhui, XU Yongchang, TAO Mingxin, et al. Helium and argon isotope geochemistry of natural gases in China's petroliferous basins[J]. Chinese Journal of Geochemistry, 2011, 30(1): 19-32. doi: 10.1007/s11631-011-0483-9
    [16]
    徐永昌. 天然气中氦同位素分布及构造环境[J]. 地学前缘, 1997, 4(3/4): 185-190. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY7Z2.031.htm

    XU Yongchang. Helium isotope distribution of natural gasses and its structural setting[J]. Earth Science Frontiers, 1997, 4(3/4): 185-190. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY7Z2.031.htm
    [17]
    REN Jianguo, XU Sheng, SUN Mingliang, et al. Excess 3He and its distribution in the western Pacific seawater[J]. Chinese Science Bulletin, 1992, 37(15): 1288-1292.
    [18]
    杜建国, 徐永昌, 孙明良. 中国大陆含油气盆地的氦同位素组成及大地热流密度[J]. 地球物理学报, 1998, 41(4): 494-501. doi: 10.3321/j.issn:0001-5733.1998.04.008

    DU Jianguo, XU Yongchang, SUN Mingliang. Helium isotopes and heat flow in the oil and gas bearing basins in China's continent[J]. Acta Geophysica Sinica, 1998, 41(4): 494-501. doi: 10.3321/j.issn:0001-5733.1998.04.008
    [19]
    王先彬. 稀有气体同位素地球化学和宇宙化学[M]. 北京: 科学出版社, 1989: 451.

    WANG Xianbin. Noble gas isotope geochemistry and cosmochemistry[M]. Beijing: Science Press, 1989: 451.
    [20]
    徐胜, 徐永昌, 沈平, 等. 中国东部盆地天然气中氖同位素组成及其地质意义[J]. 科学通报, 1996, 41(21): 1970-1972. doi: 10.3321/j.issn:0023-074X.1996.21.013

    XU Sheng, XU Yongchang, SHENG Ping, et al. Neon isotopic composition and geological significance of natural gas in the East China Basin[J]. Chinese Science Bulletin, 1996, 41(21): 1970-1972. doi: 10.3321/j.issn:0023-074X.1996.21.013
    [21]
    刘文汇, 张殿伟, 王晓锋, 等. 天然气气-源对比的地球化学研究[J]. 沉积学报, 2004, 22(S1): 27-32. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB2004S1004.htm

    LIU Weihui, ZHANG Dianwei, WANG Xiaofeng, et al. Geochemistry study on gas-source correlation of natural gas[J]. Acta Sedimentologica Sinica, 2004, 22(S1): 27-32. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB2004S1004.htm
    [22]
    BUTLER W A, JEFFERY P M, REYNOLDS J H, et al. Isotopic variations in terrestrial xenon[J]. Journal of Geophysical Research, 1963, 68(10): 3283-3291. doi: 10.1029/JZ068i010p03283
    [23]
    徐胜, 徐永昌, 沈平, 等. 中国东部盆地天然气中氙同位素过剩[J]. 科学通报, 1997, 42(1): 78-80. doi: 10.3321/j.issn:0023-074X.1997.01.024

    XU Sheng, XU Yongchang, SHENG Ping, et al. Excess of xenon isotope in natural gas from the eastern basin of China[J]. Chinese Science Bulletin, 1997, 42(1): 78-80. doi: 10.3321/j.issn:0023-074X.1997.01.024
    [24]
    刘文汇, 孙明良, 徐永昌. 鄂尔多斯盆地天然气稀有气体同位素特征及气源示踪[J]. 科学通报, 2001, 46(22): 1902-1905. doi: 10.3321/j.issn:0023-074X.2001.22.014

    LIU Weihui, SUN Mingliang, XU Yongchang. Noble gas isotope characteristics and tracing of gas sources of natural gas in Ordos Basin[J]. Chinese Science Bulletin, 2001, 46(22): 1902-1905. doi: 10.3321/j.issn:0023-074X.2001.22.014
    [25]
    赵欢欢, 梁慨慷, 魏志福, 等. 松辽盆地富氦气藏差异性富集规律及有利区预测[J]. 天然气地球科学, 2023, 34(4): 628-646. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX202304004.htm

    ZHAO Huanhuan, LIANG Kaikang, WEI Zhifu, et al. Differential enrichment of helium-rich gas reservoirs in Songliao Basin and favorable area forecast[J]. Natural Gas Geoscience, 2023, 34(4): 628-646. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX202304004.htm
    [26]
    XU Sheng, NAKAI S, WAKITA H, et al. Helium isotope compositions in sedimentary basins in China[J]. Applied Geochemistry, 1995, 10(6): 643-656. doi: 10.1016/0883-2927(95)00033-X
    [27]
    霍秋立, 杨步增, 付丽. 松辽盆地北部昌德东气藏天然气成因[J]. 石油勘探与开发, 1998, 25(4): 17-19. doi: 10.3321/j.issn:1000-0747.1998.04.006

    HUO Qiuli, YANG Buzeng, FU Li. Genesis of natural gas of eastern Changde gas pool in northern Songliao Basin[J]. Petroleum Exploration and Development, 1998, 25(4): 17-19. doi: 10.3321/j.issn:1000-0747.1998.04.006
    [28]
    王杰, 陈践发, 王铁冠, 等. 松辽盆地双城-太平川地区天然气成因类型及气源[J]. 石油学报, 2006, 27(3): 16-21. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200603003.htm

    WANG Jie, CHEN Jianfa, WANG Tieguan, et al. Gas source rocks and gas genetic type in Shuangcheng-Taipingchuan area of Songliao Basin[J]. Acta Petrolei Sinica, 2006, 27(3): 16-21. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200603003.htm
    [29]
    倪云燕, 戴金星, 周庆华, 等. 徐家围子断陷无机成因气证据及其份额估算[J]. 石油勘探与开发, 2009, 36(1): 35-45. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK200901006.htm

    NI Yunyan, DAI Jinxing, ZHOU Qinghua, et al. Geochemical characteristics of abiogenic gas and its percentage in Xujiaweizi Fault Depression, Songliao Basin, NE China[J]. Petroleum Exploration and Development, 2009, 36(1): 35-45. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK200901006.htm
    [30]
    YU Yunliang, NIU Wenqing, YANG Guang, et al. Mechanisms for the accumulation of deep gas in the southern Songliao Basin, China[J]. Journal of Petroleum Science and Engineering, 2019, 182: 106302. doi: 10.1016/j.petrol.2019.106302
    [31]
    陶士振, 戴金星, 邹才能, 等. 松辽盆地火山岩包裹体稀有气体同位素与天然气成因成藏示踪[J]. 岩石学报, 2012, 28(3): 927-938. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201203022.htm

    TAO Shizhen, DAI Jinxing, ZOU Caineng, et al. The trace of genesis, formation and mineral resources of natural gas and rare gas isotope existing in volcanic inclusion of Songliao Basin[J]. Acta Petrologica Sinica, 2012, 28(3): 927-938. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201203022.htm
    [32]
    FENG Zhiqiang, JIA Chengzai, XIE Xinong, et al. Tectonostratigraphic units and stratigraphic sequences of the nonmarine Songliao Basin, Northeast China[J]. Basin Research, 2010, 22(1): 79-95. doi: 10.1111/j.1365-2117.2009.00445.x
    [33]
    张玮, 李洪革, 李明杰. 松辽盆地南部长岭断陷区深层构造特征与天然气聚集[J]. 石油与天然气地质, 2008, 29(1): 120-127. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT200801021.htm

    ZHANG Wei, LI Hongge, LI Mingjie. Structural characteristics and gas accumulation in the deep of the Changling Fault Depression, the south Songliao Basin[J]. Oil & Gas Geology, 2008, 29(1): 120-127. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT200801021.htm
    [34]
    于丹, 吕延防, 付晓飞, 等. 松辽盆地北部徐家围子断陷断裂构造特征及对深层天然气的控制作用[J]. 地质论评, 2010, 56(2): 237-245. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLP201002011.htm

    YU Dan, LV Yanfang, FU Xiaofei, et al. Characteristics of fault structure and its control on deep gas reservoir in Xujiaweizi Fault Depression, Songliao Basin[J]. Geological Review, 2010, 56(2): 237-245. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLP201002011.htm
    [35]
    戴金星, 胡国艺, 倪云燕, 等. 中国东部天然气分布特征[J]. 天然气地球科学, 2009, 20(4): 471-487. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX200904002.htm

    DAI Jinxing, HU Guoyi, NI Yunyan, et al. Distribution characteristics of natural gas in Eastern China[J]. Natural Gas Geoscience, 2009, 20(4): 471-487. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX200904002.htm
    [36]
    WEI Guoqi, WANG Dongliang, WANG Xiaobo, et al. Characteristics of noble gases in the large Gaoshiti-Moxi gas field in Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2014, 41(5): 585-590. doi: 10.1016/S1876-3804(14)60069-0
    [37]
    何大祥, 唐友军, 胡锦杰, 等. 塔里木盆地天然气中稀有气体地球化学特征[J]. 石油与天然气地质, 2020, 41(4): 755-762. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT202004010.htm

    HE Daxiang, TANG Youjun, HU Jinjie, et al. Geochemical characteristics of noble gases in natural gases from the Tarim Basin[J]. Oil & Gas Geology, 2020, 41(4): 755-762. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT202004010.htm
    [38]
    孙明良. 天然气中稀有气体同位素的分析技术[J]. 沉积学报, 2001, 19(2): 271-275. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200102017.htm

    SUN Mingliang. Measurement technology of noble gas isotopes in natural gases[J]. Acta Sedimentologica Sinica, 2001, 19(2): 271-275. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200102017.htm
    [39]
    鲁雪松, 魏立春, 宋岩, 等. 松辽盆地南部长岭断陷高含CO2气藏成藏机制分析[J]. 天然气地球科学, 2011, 22(4): 657-663. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201104014.htm

    LU Xuesong, WEI Lichun, SONG Yan, et al. Study on the pool-forming mechanism of high content CO2 gas pools in Changling Fault-Depression, south Songliao Basin[J]. Natural Gas Geoscience, 2011, 22(4): 657-663. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201104014.htm
    [40]
    TRIELOFF M, KUNZ J, CLAGUE D A, et al. The nature of pristine noble gases in mantle plumes[J]. Science, 2000, 288(5468): 1036-1038.
    [41]
    BALLENTINE C J, PORCELLI D, WIELER R. Noble gases in mantle plumes[J]. Science, 2011, 291(5512): 2269.
    [42]
    BALLENTINE C J, O'NIONS R K. The nature of mantle neon contributions to Vienna Basin hydrocarbon reservoirs[J]. Earth and Planetary Science Letters, 1992, 113(4): 553-567.
    [43]
    XU Yongchang, SHEN Ping, TAO Mingxin, et al. Geochemistry on mantle-derived volatiles in natural gases from Eastern China oil/gas provinces (Ⅱ): helium, argon and hydrocarbons in mantle volatiles[J]. Science in China (Series D: Earth Sciences), 1997, 40(3): 315-321.
    [44]
    刚文哲, 高岗, 郝石生, 等. 论乙烷碳同位素在天然气成因类型研究中的应用[J]. 石油实验地质, 1997, 19(2): 164-167. doi: 10.11781/sysydz199702164

    GANG Wenzhe, GAO Gang, HAO Shisheng, et al. Carbon isotope of ethane applied in the analyses of genetic types of natural gas[J]. Experiment Petroleum Geology, 1997, 19(2): 164-167. doi: 10.11781/sysydz199702164
    [45]
    MOREIRA M, RAQUIN A. The origin of rare gases on Earth: the noble gas'subduction barrier'revisited[J]. Comptes Rendus Géoscience, 2007, 339(14/15): 937-945.
    [46]
    STAUDACHER T, ALLōGRE C J. Terrestrial xenology[J]. Earth and Planetary Science Letters, 1982, 60(3): 389-406.
    [47]
    XU Yongchang, SHENG Ping, TAO Mingxin, et al. Industrial accumulation of mantle source helium and the Tanchenglujiang fracture zone[J]. Chinese Science Bulletin, 1991, 36(6): 494-498.
    [48]
    NOHDA S, CHEN Hai, TATSUMI Y. Geochemical stratification in the upper mantle beneath NE China[J]. Geophysical Research Letters, 1991, 18(1): 97-100.
    [49]
    TATSUMOTO M, BASU A R, HUANG Wankang. Sr, Nd, and Pb isotopes of ultramafic xenoliths in volcanic rocks of Eastern China: enriched components EMI and EMII in subcontinental lithosphere[J]. Earth and Planetary Science Letters, 1992, 113(1/2): 107-128.
    [50]
    陈俊, 王鹤年. 地球化学[M]. 北京: 科学出版社, 2004: 418.

    CHEN Jun, WANG Henian. Geochemistry[M]. Beijing: Science Press, 2004: 418.
    [51]
    云金表, 殷进垠, 金之钧. 松辽盆地深部地质特征及其盆地动力学演化[J]. 地震地质, 2003, 25(4): 595-608. https://www.cnki.com.cn/Article/CJFDTOTAL-DZDZ200304007.htm

    YUN Jinbiao, YIN Jinyin, JIN Zhijun. Deep geological feature and dynamic evolution of the Songliao Basin[J]. Seismology and Geology, 2003, 25(4): 595-608. https://www.cnki.com.cn/Article/CJFDTOTAL-DZDZ200304007.htm
    [52]
    POLYAK B G, PRASOLOV E M, ERMÁK V, et al. Isotopic composition of noble gases in geothermal fluids of the Krušné Hory Mts., Czechoslovakia, and the nature of the local geothermal anomaly[J]. Geochimica et Cosmochimica Acta, 1985, 49(3): 695-699.
    [53]
    徐永昌. 天然气中稀有气体地球化学[M]. 北京: 科学出版社, 1998: 231.

    XU Yongchang. Geochemistry of noble gas in natural gas[M]. Beijing: Science Press, 1998: 231.
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