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
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摘要:
氦源岩评价是氦气资源评价的关键，主要包含岩石类型、生氦元素铀和钍丰度、形成年龄及体积4个关键参数。花岗岩作为主要氦源岩，其中前3个参数易于获取，而花岗岩体积这一参数一直缺乏约束。渭河盆地具有良好的氦气资源潜力，而且其南缘巨大的花岗岩基被认为是盆地内壳源氦的主要氦源，为研究这一参数提供了良好的条件。本次研究选取蓝田岩基作为对象，综合地质、地球物理资料，将其几何形态限定为接近高长宽比和薄板的椭圆柱体。根据岩体长度和厚度的幂次定律，计算得到蓝田岩基的厚度为4.7 km、体积为572 km3。放射性分析结果显示蓝田岩基的U、Th丰度平均值为5.8×106、19.0×106。通过放射性衰变原理，计算得出蓝田岩基自形成以来能产生的氦气量为2.71×108 m3。结合区域花岗岩地质特征，笔者进一步估算出渭河盆地南缘花岗岩的生氦资源总量（184×108 m3），这一结果为渭河盆地氦气资源勘探突破、氦气资源评价体系建立提供了启示和依据。
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 selected 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 radioactive 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 evaluated 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.
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Key words:
- Helium source rock /
- granite /
- volume /
- helium production
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图 4 不同深度下不同产状侵入体的厚度T、长度L与面积A之间关系（修改自Brown, 2013）
Figure 4.
表 1 渭河盆地南缘花岗岩基生氦量计算参数
Table 1. Parameters of helium production in Granitic batholiths in southern Weihe Basin
参数 年龄t
（Ma）*平面长度L
（km）平面宽度W
（km）平均厚度T
（km）体积V
（km3）生氦元素 生氦速率
（cm3/g·y）生氦量P
（108 m3）U（10−6） Th（10−6） 蓝田岩基 150 31 5 4.7 572 5.8 19 1.26E-12 2.71 宝鸡岩基 213 100 20 9.5 14930 3.97 19.48 1.05E-12 83.7 太白岩基 214 60 30 7.0 9890 3.97 21.63 1.12E-12 58.8 翠华山岩基 227 30 20 4.6 2175 11.47 19.62 1.97E-12 24.3 牧护关岩基 151 20 10 3.6 568 7.59 21.73 1.56E-12 3.35 老牛山岩基 152 50 9 6.3 2216 4.07 25.7 1.25E-12 10.5 华山岩基 134 20 6 3.6 341 4.72 8.68 8.29E-13 0.95 合计 184 注：*年龄引自Jiang等（2010）、丁丽雪等（2010）、齐秋菊等（2012）、吕星球等（2014）、薛颖瑜等（2015）。 
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