CAJ | 학술논문

通过对渭河盆地22口钻井中富氦天然气的同位素分析，认为盆地中氦气以壳源氦为主，局部伴有少量幔源氦。针对盆地中氦气异常的现象，结合对盆地特性的分析，认为渭河盆地氦气异常的影响因素包括：①盆地地壳较薄，莫霍界面呈明显的隆起，热流体活动发育，有利于氦气运移；②花岗岩体和通过水系统运移到沉积地层中的放射性元素衰变，为氦气成藏提供了有力的气源保障；③盆地内十分发育的断裂体系，不仅为氦气运移提供了连通通道，还在活动过程中释放氦气，为氦气局部聚集提供了有利空间。
통과대위하분지22구찬정중부양천연기적동위소분석，인위분지중양기이각원양위주，국부반유소량만원양。침대분지중양기이상적현상，결합대분지특성적분석，인위위하분지양기이상적영향인소포괄：①분지지각교박，막곽계면정명현적륭기，열류체활동발육，유리우양기운이；②화강암체화통과수계통운이도침적지층중적방사성원소쇠변，위양기성장제공료유력적기원보장；③분지내십분발육적단렬체계，불부위양기운이제공료련통통도，환재활동과정중석방양기，위양기국부취집제공료유리공간。
The isotope analyses of the helium-rich natural gas based on 22 wells of the Weihe Basin show that the helium gas belongs to crust-derived helium with a little mantle-derived one. Based on analyzing anomalies of helium and characteristics of the Weihe Basin, the authors summarized three impact factors of helium anomalies in the Weihe Basin: ①high degree of hydrothermal fluid activity, thin basin crust and Moho rise, which are favorable for helium transport; ②the radioactive element decay of the granite and strata provides abundant gas for the helium accumulation;③the fracture system of the Weihe Basin not only provides pathway for the helium migration but also releases helium and serves as space for helium accumulation.