天然氢对页岩油的资源意义——以阳信洼陷为例

    Resource significance of natural hydrogen for shale oil: A case study of Yangxin Sag

    • 摘要: 全球范围内,寻找低碳可持续供应的H2是氢能社会发展和能源绿色转型的重要议题。天然氢以其零碳、低价的独特优点,被视为未来氢能社会的重要H2供应方式,勘探开发天然氢已成为能源领域的研究热点。然而,由于天然氢具有独特的形成与富集过程,其有利分布区仍未取得共识。目前仅有小规模商业开发案例,大规模开发利用仍需要假以时日,因此,直接开发利用天然氢(即天然氢的直接能源意义)目前仍处于探索阶段。天然氢进入沉积盆地,特别是富有机质页岩后,促进有机质生烃作用(即天然氢的间接能源意义),这不仅对提升盆地油气资源潜力意义重大,更是现阶段探讨天然氢能源意义较为可行的技术路线。在前人研究的基础上,提出板块碰撞带附近的小型沉积盆地具有天然氢形成与保存的组合条件,是未来有望实现天然氢勘探和经济利用突破的最有利地区; 以济阳坳陷阳信洼陷沙四段烃源岩为例,探讨了多期叠加发育的具有较强生氢能力的侵入体促进烃源岩生烃的潜力,通过计算认为,阳信洼陷侵入体叠加面积为165 km2,可以影响约36.40 km3的烃源岩,提高沙四段烃源岩原油资源量约1 796.34×104 t,比原评估资源量提高了8.55%。研究为重新评估发育有多层深源岩席侵入的小型沉积盆地的资源量提供了一种新的视角,对传统观念中被认为因构造活跃导致勘探前景欠佳的区块进行重新认识具有重要意义。

       

      Abstract: Globally, the search for low-carbon and sustainable hydrogen supply is a critical issue for the development of hydrogen-based society and the green transition of energy. Natural hydrogen, with its unique advantages of being zero-carbon and low-cost, is regarded as an important future supply method for hydrogen energy. Consequently, the exploration and development of natural hydrogen have become a research hotspot in the energy sector. However, natural hydrogen has a unique formation and enrichment process, and there is still no consensus on its favorable distribution areas. On the other hand, although there are small-scale commercial development cases, large-scale utilization of natural hydrogen remains a future prospect. The direct energy significance of natural hydrogen is still challenging, including direct exploitation and utilization. The indirect energy significance of natural hydrogen is that it promotes hydrocarbon generation from organic matter when it enters sedimentary basins, especially organic-rich shales. This indirect energy significance of natural hydrogen is not only great importance for enhancing the hydrocarbon resource potential of petroliferous basins, but also the most practical way to realize its energy value at present. The small sedimentary basins near plate collision zones are the most favorable areas for future breakthroughs in natural hydrogen exploration and economic utilization based on previous research, due to their combined conditions for the formation and preservation of natural hydrogen. The potential of multi-stage stacked intrusive bodies with strong hydrogen generation capacity promoting hydrocarbon generation in source rocks was explored in this study, with the Es4 source rocks in Yangxin Sag of Jiyang Depression as an example. The calculations show that intrusive bodies covering an area of 165 km2 in Yangxin Sag can influence approximately 36.40 km3 of source rocks, increasing the crude oil resource volume of Es4 source rocks by about 1 796.34×104 tons, which is 8.55% higher than the originally assessed resource. This study could provide a new perspective for re-evaluating the resource potential of small sedimentary basins with multi-layered deep intrusive sheets, and is of great significance for re-evaluating blocks traditionally considered to have poor exploration prospects due to tectonic activity.

       

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