摘要
天然气水合物的开采方式与常规化石能源开采方式不同,通常需要从外界注入能量引起水合物原位分解。由于自然界中天然气水合物赋存条件的差异导致原位分解时所需的热量不同,造成一些条件下获取天然气水合物单位有效能量时由天然气水合物排放出的CO2量会高于石油或煤,而过量的CO2排放到大气中会对环境带来十分不利的影响。本文以青海木里煤田聚乎更矿区DK-1钻孔为研究对象,通过适当模型简化,并结合测井获取的相关数据,分别针对天然气水合物133.5～135.5m和142.9～147.7m两个产出层段进行开采能耗的热力学分析与计算。结果表明：两个层段天然气水合物CO2排放强度分别为79.51t/TJ、78.20t/TJ,均大于石油的排放强度,说明这两个层段天然气水合物在热能利用过程中并不具备环保优势。
Unlike that of conventional fossil fuels,the production of natural gas hydrate mainly requires energy inputting to dissociate gas hydrate in situ.The energy-consuming of in situ dissociation varies due to the diversity of deposit conditions in nature.Under some conditions,CO2 emissions of gas hydrate exceed the amount of CO2 emitted by conventional fossil fuels such as coal or petroleum when the equivalent effective energy is produced,and the excessive CO2 released into the atmosphere exerts harmful impact on environment.Taking DK-1Well of Muri Coalfield as an example,this paper,by properly simplifying the model and combining well-log data,conducts the thermodynamic calculations of the energy consumption for the exploitation of natural gas hydrate from 133.5～135.5mlayer and 142.9～147.7mlayer separately.The CO2 emission intensity of natural gas hydrate from these two layers is 79.51t/TJ and 78.20t/TJ respectively.The results indicate that the exploitation of natural gas hydrate from the two layers is not environmental-friendly in terms of CO2 emission.
出处
《安全与环境工程》
CAS
北大核心
2014年第4期10-12,18,共4页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41174159)
