Abstract:Helium is an important carrier of information on crust-mantle material exchange and a strategic rare gas resource critical to national security and high-tech industries.Based on drilling,logging,and 2D seismic data,we analyzed the reservoir geological conditions in Y Region of the Gushi Sag,Weihe Basin,and characterized the helium accumulation conditions,aiming to deeply understand the geological structural features,reservoir properties,and helium occurrence state in this area,to predict helium-rich zones and provide a scientific basis for helium resource exploration,development,and sustainable utilization.The results showed that the main reservoir in Y Region-the Gaoling Group and the Lantian-Bahe Formation,had good physical and electrical properties.In the early stage,a fan delta developed;by the time of Zhangjiapo Formation deposition,the shore-shallow lacustrine deposition expanded,and the delta retreated landward,forming an excellent reservoir-caprock assemblage.The regional basement granite provided ample helium source,and circulating geothermal water served as a carrier for helium migration and accumulation.Deep,large faults provided pathways for helium migration and helped form various structural traps,while the Zhangjiapo Formation caprock effectively prevented helium from escaping,facilitating helium accumulation.In the Lantian-Bahe Formation,the gas-bearing water layer is 48-102 m thick with a favorable depositional environment,making it the main target interval for helium exploration in the Y Region.This research provides technical support for selecting key target areas for helium exploration in the Weihe Basin.
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