Discovery of Helium-Rich Resources in Coal Seams of the Eastern Margin of Ordos Basin and Its Resource Potential as well as Exploration&Development Strategies
Helium has an irreplaceable role in the development of various high-tech industries.Currently,the helium used in China mainly comes from imports,with a high degree of dependence on foreign countries,and the security of helium resources is a prominent issue.It is an urgent task to search for helium resources,clarify the enrichment mechanism of helium,and find out the countermeasures of exploration and development.The Ordos Basin is rich in coalbed methane resources,and the current exploration and development achievements are remarkable.In order to clarify the distribution and potential of helium resources in the Ordos Basin,this paper,on the basis of systematic sampling and analysis of the eastern margin of the Ordos Basin,has carried out a study on the distribution of helium resources in coal bed in the Ordos Basin.The results show that,the coalbed methane of Sanjiaobei area at the eastern edge of the basin as a whole can reach the helium-rich natural gas standard.Based on the proved reserves submitted by the end of 2020,the converted helium proved reserves are about 40 million cubic meters.Therefore,helium-rich areas may also exist in the coal beds of the Ordos Basin.The converted helium proven reserves are about 34 million cubic meters based on the proven geological reserves of 1 121.62×108 m3 of deep coalbed methane submitted by the Daning-Jixian area in 2021.the Ordos Basin has the capability to build coalbed(rock)-helium strategic reserve base and it is recommended to accelerate the separation and development of coalbed helium in Sanjiao block to avoid the waste of helium resources.Meanwhile,the helium isotope ratio reveals that helium in the coal bed of Ordos Basin is mainly of crustal origin,and Sanjiaobei area has good conditions for helium enrichment,which is a key area for coalbed helium resource exploration.While carrying out the coalbed helium resource census,it is suggested to strengthen the research on the exploration and enrichment law of helium resources in coal beds(rocks),provide technical support for the effective utilization of coal beds(rocks)helium in order to keep the national helium resource security.
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