煤田地质与勘探2025，Vol.53Issue(6)：129-142,14.DOI:10.12363/issn.1001-1986.25.02.0112
鄂尔多斯盆地东缘石西区块氦源岩有效性评价及空间展布特征
Effectiveness assessment and spatial distribution characteristics of helium source rocks in the Shixi Block along the eastern margin of the Ordos Basin
摘要
Abstract
[Background]Helium gas serves as a significant rare strategic resource.In China,helium resources are relat-ively scarce and dependent heavily on imports.Therefore,there is a pressing need for the exploration and exploitation of helium resources.Helium source rocks provide a material basis for the formation of helium resources.The Zijinshan pluton serves as a principal source of coal-measure helium along the eastern margin of the Ordos Basin.Previous stud-ies reveal that helium in natural gas within the Shixi Block originates primarily from the decay of radioactive elements in the deep part of the Jianjiagou-Zijinshan plutons.However,there is a lack of reports on the discovery of helium-rich nat-ural gas in the Linxing Block,which is closer to the Zijinshan pluton.[Methods]This study investigated the Linxing and Shixi Blocks as study areas.Utilizing the geochemical parameters and mineralogical characteristics of helium source rocks in these blocks,this study quantitatively analyzed the helium-generating intensities of the helium source rocks,as-sessed their effectiveness,and calculated their helium generation volumes.In combination with log data,this study in-vestigated the spatial distribution characteristics of potential helium source rocks in the Shixi Block along the eastern margin of the Ordos Basin.[Results and Conclusions]The potential helium source rocks in the Shixi Block exhibit uranium(U)content ranging from 0.25×10-6 to 9.19×10-6 and thorium(Th)content from 0.56×10-6 to 21.0×10-6.In contrast,potential helium source rocks in the Linxing Block manifest U content ranging from 1.29×10-6 to 207×10-6 and Th content from 8.19×10-6 to 438×10-6.Within the Shixi and Linxing blocks,U and Th occur predominantly as iso-morphism in the basement granites.In bauxites,mudstones,coals,and sandstones,U and Th occur primarily in ad-sorbed and complexed forms,associated with organic matter and clay minerals.The Shixi and Linxing blocks have total helium generation volumes ranging from 4.92×108 m3 to 6.94×108 m3 and from 75.7×108 m3 to 110.4×108 m3,respect-ively.Primary helium source rocks in the Shixi Block include the metamorphic series and granites in the basement,fol-lowed by dolomites,sandstones,mudstones and coals.In contrast,primary helium source rocks in the Linxing Block en-compass the metamorphic series and granites in the basement,along with the Zijinshan pluton,succeeded by dolomites,sandstones,mudstones,coals,and bauxites.Given the lack of log data,this study failed to analyze the spatial distribu-tion characteristics of helium source rocks in the Linxing Block.However,the calculated helium generation volumes suggest the exploration and exploitation potential throughout the Linxing Block.The helium source rocks in the Shixi Block(except for the basement)are thick in the western and thin in the eastern portions.Notably,both sandstones in the lower Shihezi Formation and most strata in the Shanxi Formation exhibit high helium generation volumes.Therefore,these strata should be highlighted in the exploration and exploitation of helium resources.关键词
石西区块/临兴区块/氦源岩/生氦量/空间展布Key words
Shixi Block/Linxing Block/helium source rock/helium generation volume/spatial distribution分类
能源科技引用本文复制引用
常洋梅,刘超,孙蓓蕾..鄂尔多斯盆地东缘石西区块氦源岩有效性评价及空间展布特征[J].煤田地质与勘探,2025,53(6):129-142,14.基金项目
国家自然科学基金项目(42172193) （42172193）
中国石油化工股份有限公司石油勘探开发研究院开放基金项目(33550000-24-ZC0613-0015) （33550000-24-ZC0613-0015）
山西省科技创新人才团队专项项目(202304051001028) （202304051001028）
