Geologic hydrogen could be a low-carbon primary energy resource; however, the magnitude of Earth’s subsurface endowment has not yet been assessed. Knowledge of the occurrence and behavior of natural hydrogen on Earth has been combined with information from geologic analogs to construct a mass balance model to predict the resource potential. Given the associated uncertainty, stochastic model results predict a wide range of values for the potential in-place hydrogen resource [10 3 to 10 10 million metric tons (Mt)] with the most probable value of ~5.6 × 10 6 Mt. Although most of this hydrogen is likely to be impractical to recover, a small fraction (e.g., 1 × 10 5 Mt) would supply the projected hydrogen needed to reach net-zero carbon emissions for ~200 years. This amount of hydrogen contains more energy (~1.4 × 10 16 MJ) than all proven natural gas reserves on Earth (~8.4 × 10 15 MJ). Study results demonstrate that further research into understanding the potential for geologic hydrogen resources is merited.

中文翻译：

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全球地质氢资源模型预测


地质氢可以是一种低碳的一次能源资源;然而，地球地下禀赋的大小尚未得到评估。关于地球上天然氢的出现和行为的知识与地质模拟的信息相结合，构建了一个质量平衡模型来预测资源潜力。鉴于相关的不确定性，随机模型结果预测了潜在的就地氢资源值范围很广 [10 3 到 10 1000 万吨 （Mt）]，最可能的值为 ~5.6 × 10 6 Mt。尽管大部分氢气可能无法回收，但一小部分（例如，1 × 10 5 Mt）将提供 ~200 年实现净零碳排放所需的预计氢气。这一数量的氢气含有比地球上所有已探明的天然气储量（~8.4 × 10 15 MJ）更多的能量 （~1.4 × 10 16 MJ）。研究结果表明，值得进一步研究以了解地质氢资源的潜力。