Helium enrichment theory and exploration ideas for helium-rich gas reservoirs  

作　　者：QIN Shengfei Dou Lirong TAO Gang LI Jiyuan QI Wen LI Xiaobin GUO Bincheng ZHAO Zizhuo WANG Jiamei 

机构地区：[1]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [2]PetroChina Research Institute of Petroleum Exploration&Development-Northwest,Lanzhou 730020,China [3]Northwest Institute of Eco-Environmental Resources,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Petroleum Exploration and Development》2024年第5期1340-1356,共17页石油勘探与开发（英文版）

基　　金：Supported by the National Natural Science Foundation of China(42141022,42272189);Project of Ministry of Natural Resources of China(QGYQZYPJ2022-1);CNPC Core Project(2021ZG12)。

摘　　要：Using gas and rock samples from major petroliferous basins in the world,the helium content,composition,isotopic compositions and the U and Th contents in rocks are analyzed to clarify the helium enrichment mechanism and distribution pattern and the exploration ideas for helium-rich gas reservoirs.It is believed that the formation of helium-rich gas reservoirs depends on the amount of helium supplied to the reservoir and the degree of helium dilution by natural gas,and that the reservoir-forming process can be summarized as"multi-source helium supply,main-source helium enrichment,helium-nitrogen coupling,and homogeneous symbiosis".Helium mainly comes from the radioactive decay of U and Th in rocks.All rocks contain trace amounts of U and Th,so they are effective helium sources.Especially,large-scale ancient basement dominated by granite or metamorphic rocks is the main helium source.The helium generated by the decay of U and Th in the ancient basement in a long geologic history,together with the nitrogen generated by the cracking of the inorganic nitrogenous compounds in the basement rocks,is dissolved in the water and preserved.With the tectonic uplift,the ground water is transported upward along the fracture to the gas reservoirs,with helium and nitrogen released.Thus,the reservoirs are enriched with both helium and nitrogen,which present a clear concomitant and coupling relationship.In tensional basins in eastern China,where tectonic activities are strong,a certain proportion of mantle-derived helium is mixed in the natural gas.The helium-rich gas reservoirs are mostly located in normal or low-pressure zones above ancient basement with fracture communication,which later experience substantial tectonic uplift and present relatively weak seal,low intensity of natural gas charging,and active groundwater.Helium exploration should focus on gas reservoirs with fractures connecting ancient basement,large tectonic uplift,relatively weak sealing capacity,insufficient natural gas charging intensity,and rich ancient forma

关 键 词：reservoir performance analysis artificial intelligence large model application-specific large language model incremental pre-training fine-tuning subsystems coupling entity recognition tool invocation 

分 类 号：P618.13[天文地球—矿床学] TE37[天文地球—地质学]