山西氦气战略资源类型与资源前景

    Helium resource types and prospectivity in Shanxi Province, China

    • 摘要: 氦气作为关系国家安全与高新技术产业发展的关键稀有战略资源,我国氦气供应长期依赖进口,资源安全形势严峻,寻找氦气资源,特别是高-富氦资源对国家资源安全意义重大而紧迫。借鉴渭河盆地氦气资源调查成果和经验,2019年首次启动了山西省氦气资源调查,通过广泛采样分析、资料收集和综合地质研究,在晋中盆地、忻定盆地、运城-临汾盆地等,发现地热井伴生气中氦气含量普遍较高,多口井氦气含量大于10%,最高达18.86%,远高于0.1%的氦气资源工业品位,属世界罕见的特富氦资源,显示良好的资源前景。对油气区气井样品分析表明,鄂尔多斯盆地东缘北部石西区块天然气氦含量0.02%~0.23%,平均0.089%,部分样品具备潜在利用价值;鄂尔多斯盆地东缘南部吉县、乡宁县部分煤层气样品氦含量0.16%~0.21%,平均0.18%,具备利用价值;晋中盆地平遥县1口煤层气井氦含量为0.16%,符合工业品位要求;而沁水盆地煤层气氦含量极低,不具备利用价值。调查表明,山西省境内氦气资源赋存层位不仅包含与渭河盆地相同的新生界,更广泛的发育层位与鄂尔多斯盆地相同的古生界气层;氦气资源类型涵盖地热水伴生气、煤层气、致密气、灰岩裂缝气等,成因类型以壳源氦为主,新发现铝土岩系是重要的氦源岩,并提出了铝土岩型新型富氦气藏类型;载体(气)类型包括地热水、烃类气及氮气等,且地热井氦气含量普遍较高,水溶气广泛分布,游离气在局部区域富集。综合研究认为,山西省氦气富集条件整体优越,资源类型丰富,分布范围广泛,资源前景广阔,未来需根据氦气富集规律,秉持区别于油气勘探的氦气调查理念,拓展新领域以获取增量富氦资源,落实老气区存量氦气资源,同步推进高-富氦资源高效保障与低品位氦气资源有效利用的氦气资源多元保障路径,为国家战略需求提供支撑。

       

      Abstract: Helium(He) is a critical strategic rare resource closely related to national security and the development of high-tech industries. China has long relied on imports for helium supply, and the resource-security situation is severe. Therefore, identifying helium resources—especially high-helium and helium-rich resources—is of great and urgent significance to national resource security. Drawing on the achievements and experience of helium resource investigations in the Weihe Basin, Shanxi Province launched its first provincial helium survey in 2019. Based on extensive sampling and analyses, data compilation, and integrated geological assessment, geothermal well associated gases from the Jinzhong, Xinding, and Yuncheng-Linfen basins show generally high helium concentrations, with multiple wells exceeding 10% and a maximum of 18.86%. This value is far above the commonly cited industrial threshold(0.1%) for helium resources and represents an exceptionally helium-rich occurrence by global standards, indicating promising resource potential. Gas-well samples from petroleum and gas provinces show that natural gas from the Shixi Block in the northern part of the eastern margin of the Ordos Basin contains 0.02%-0.23% He(average 0.089%), and some samples have potential utilization value. Coalbed methane samples from Jixian and Xiangning counties in the southern part of the eastern margin of the Ordos Basin contain 0.16%-0.21% He(average 0.18%), indicating utilization value. One coalbed methane well in Pingyao County, Jinzhong Basin contains 0.16% He, meeting the industrial-grade requirement, whereas coalbed methane in the Qinshui Basin exhibits extremely low helium concentrations and is not economically viable. The survey indicates that helium-bearing intervals in Shanxi Province occur not only in the Cenozoic strata (as in the Weihe Basin) but more widely in Paleozoic gas-bearing strata comparable to those in the Ordos Basin; helium resource types include geothermal-water associated gas, coalbed methane, tight gas, and fractured limestone gas, and helium is predominantly crustal in origin. Bauxite strata are newly recognized as important helium source rocks, and a bauxite-type helium-rich reservoir model is proposed. Helium carriers include geothermal water, hydrocarbon gases, and nitrogen; geothermal wells generally show high helium concentrations, dissolved gas is widely distributed, and free gas is locally enriched. Overall, Shanxi Province exhibits favorable helium enrichment conditions, diverse resource types, broad distribution, and strong prospectivity. Future work should follow a helium-oriented investigation concept distinct from conventional oil and gas exploration, expand new domains to obtain incremental helium-rich resources, delineate helium resources in mature gas provinces, and simultaneously promote efficient security of high-helium/helium-rich resources and effective utilization of low-grade helium resources, thereby establishing a diversified helium resource supply pathway to support national strategic demands.

       

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