煤田地质与勘探2025，Vol.53Issue(6)：109-119,11.DOI:10.12363/issn.1001-1986.25.01.0080
塔里木盆地库车坳陷煤系天然气贫氦主控因素
Dominant factors causing helium deficiency in coal-measure natural gas in the Kuqa Depression,Tarim Basin
摘要
Abstract
[Background]Helium is identified as a scarce strategic resource,having found widespread applications in high-tech fields such as high-end manufacturing,aerospace,and national defense due to its stable chemical properties and low boiling point.The Kuqa Depression in the Tarim Basin is a significant natural gas production base in China.De-termining the distribution characteristics and controlling factors of helium in coal-measure natural gas in the Kuqa De-pression holds great significance.[Methods]Using two helium resource assessment methods and geological data,this study explored the dominant factors causing helium deficiency in the coal-measure natural gas in the Kuqa Depression.[Results and Conclusions]The natural gas in the Kuqa Depression exhibits helium content(Volume fraction)ranging from 22×10-6 to 93×10-6(average:57.6×10-6),suggesting helium-deficient natural gas.Its 3He/4He ratios range from 3.33×10-8 to 11.24×10-8,indicating crust-derived helium.Helium in the natural gas originates primarily from the Juras-sic coal-measure source rocks,with minimal contribution from the basement.The helium deficiency is predominantly governed by the regional structural evolution and the coupling effect of the helium-and hydrocarbon-generating intensit-ies of coal-measure source rocks.In terms of structural evolution,differing from the discovered helium-rich gas fields,the Kuqa Depression has experienced continuous stratigraphic burial since the Himalayan,hindering the desorption and migration of helium.Regarding helium accumulation,the high hydrocarbon-generating intensity of coal-measure source rocks exerted a strong dilution effect on helium.Consequently,gas fields located in the hydrocarbon kitchen have a sig-nificantly lower helium content than those in the slope zone.The exploration of helium resources in coal-measure natur-al gas should focus on helium source rocks connecting the ancient basement,areas with strong regional tectonics and sig-nificant uplift of strata,and areas with weak natural gas charging and dilution.Exploration targets should be rationally selected according to helium accumulation conditions.关键词
氦气/煤系天然气/库车坳陷/贫氦原因/充注强度Key words
helium/coal-measure natural gas/Kuqa Depression/origin of helium deficiency/charging intensity分类
石油、天然气工程引用本文复制引用
刘佳润,刘全有,李朋朋,高宇,吕佳豪..塔里木盆地库车坳陷煤系天然气贫氦主控因素[J].煤田地质与勘探,2025,53(6):109-119,11.基金项目
国家自然科学基金项目(42141021,U2244209,42203027) （42141021,U2244209,42203027）
