西北地质2025，Vol.58Issue(5)：24-32,9.DOI:10.12401/j.nwg.2024133
渭河盆地主要氦源岩花岗岩的体积约束及生氦量估算:以蓝田岩基为例
The Volume of Granites in Main Helium Source Rocks of Weihe Basin and the Estimation of Their Helium Production:A Case Study of the Lantian Batholith
摘要
Abstract
As the key of helium resource evaluation,the evaluation of helium source rocks mainly consist of rock type,contents of helium-derived elements uranium and thorium,formation age and volume.Granite is viewed as the main helium source rock and first three parameters are readily accessable.However,the volume of granite is too complicated to be constrained.The Weihe basin show great potential for helium resources,in which enormous granitic batholiths along its southern magin are considered as the main helium reservoir for crustal-derived helium,providing ideal conditions for this parameter.In this study,the Lantian batholith is se-lected and the shape of it is near to a flat elliptical column with high length-width ratio based on the published geological and geophysical data.Moreover,the thickness of Lantian batholith is calculated to be 4.7 km and the volume is 572 km3 according to a power-law relationship.In addition,the results show that the average contents of helium-produced elements U and Th are 5.8×106 and 19×106 in Lantian batholith.Combined with the radioac-tive decay law,the calculated helium production for the Lantian batholith is about 0.27 billion cubic meters.In view of voluminous granitic batholiths at the south edge of Weihe basin,total helium production have been eval-uated at 18.4 billion cubic meters,which will provide significant implications for the exploration breakthrough of helium in Weihe Basin and further establishment of the helium resource evaluation.关键词
氦源岩/花岗岩/体积/生氦量Key words
Helium source rock/granite/volume/helium production分类
天文与地球科学引用本文复制引用
胡明卿,张乔,杨海星,曹毅章,徐小虎,马壮,马永福,马元..渭河盆地主要氦源岩花岗岩的体积约束及生氦量估算:以蓝田岩基为例[J].西北地质,2025,58(5):24-32,9.基金项目
中国石油煤层气有限责任公司科学研究与技术开发项目(2023-KJ-22),中国地质调查局项目"氦气资源调查评价与示范"(DD20230026),陕西省自然科学基础研究计划(2024JC-YBMS-216、2024JC-YBQN-0342、S2024-JC-YB-0817)、陕西省重点研发计划(2024GH-YBXM-04),2024年度青海省"昆仑英才·高端创新创业人才"计划A类项目"柴达木盆地北缘氦气资源成藏机理及勘探开发"联合资助. （2023-KJ-22）
