Future Utilization of Gas Hydrate Resources in Polar Regions
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摘要:
极地天然气水合物资源潜力巨大,储层类型主要为富砂沉积物储层,最可能实现远景勘探和商业利用,是一种重要的战略能源。综述了天然气水合物在极地的分布情况、极地主要地区天然气水合物矿藏资源量以及水合物开发利用的资源金字塔。结合美国、加拿大和俄罗斯在北极冻土区天然气水合物勘探开发的案例进行了4种开采技术优缺点对比,并对极地区和非极地区5次天然气水合物试采效能进行对比评价。根据目前国际油气价格、能源结构、各国水合物研究目标和我国天然气水合物勘查开发现状等,提出了我国参与极地天然气水合物研究和开发的思路。
Abstract:A great amount of gas hydrates occurs in polar regions. They are dominated by the type of sand rich reservoir which is relatively easier to be put into exploration and commercial production. Therefore, gas hydrates in the polar region are regarded as a kind of important strategic energy sources of the world. In this paper, upon the distribution of gas hydrate, we made an assessment of gas hydrate resource, and reviewed the gas hydrate resource pyramid in the polar regions. Upon the information from the US, Canada and Russia on exploration and development of gas hydrate in the Arctic region, we made an introduction to and comparison of four kinds of extraction technology, and gas hydrate pilot production efficiency in polar and non-polar regions. According to the current international oil and gas prices, the energy structure of the world, research targets of gas hydrate in various countries and the current situation of gas hydrate exploration and development in China, we suggest China actively participating in the research and development of polar gas hydrate.
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Key words:
- gas hydrate /
- strategic energy /
- exploration and development /
- polar region
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图 1 全球天然气水合物产地分布(据文献[5]修改)
Figure 1.
图 3 全球主要地区天然气水合物的天然气资源量分布(据文献[60])
Figure 3.
表 1 极地主要地区天然气水合物矿藏资源量评估
Table 1. Gas hydrate resource estimate in the polar region
表 2 四种水合物开采技术优缺点对比
Table 2. Comparison of four kinds of gas hydrate extraction technology
开采技术 优点 缺点 试验区 加热法 能有效控制水合物开采速度 1会造成大量热损失,效率很低,且要求向下注热和向上采气同步进行,开采成本昂贵
2注入技术也限制了该方法的使用加拿大马更些三角洲Mallik地区 降压法 无热量消耗和损失,不需要连续激发,成本较低,方法简便易行、无需增加设备,适用于大面积开采,尤其适用于存在下伏游离气层的水合物藏的开采,是目前最常用的方法 1不适用于储层原始温度接近或低于0 ℃的水合物矿藏
2单一使用减压法开采天然气速度很慢前苏联麦索雅哈气田、加拿大Mallik气田和美国阿拉斯加气田 注入抑制剂法 人为控制水合物矿层的分解速度 1化学试剂费用昂贵,开采速度缓慢,回采气体比较困难,还会带来一些环境污染问题
2不适用于开采海洋天然气水合物矿藏前苏联麦索雅哈气田 CO2置换开采法 能帮助减排工农业生产和日常生活中产生的CO2温室气体 投资高,目前正处于试验开采测试阶段 美国阿拉斯加 表 3 极地和非极地区天然气水合物试生产效能对比
Table 3. Comparison of gas hydrate pilot production efficiency in polar and non-polar regions
试采地点 试采时间 试采方法 持续时间 平均日产量/m3 累计气量/m3 极地 俄罗斯麦索亚哈 1969—2005年 降压法、化学抑制剂法 36 a(半连续生产) 525 000 6.9×109 加拿大Mallik 2002年 加热法为主,降压法为辅 123.65 h 100 516 2007年 降压法为主,加热法为辅 12.5 h 1 596 830 2008年 降压法 139 h 2 245 13 000 美国阿拉斯加 2012年 CO2置换法 14 d 2 143 30 000 非极地 中国祁连山 2011年 降压法、加热法 101 h 22 95 日本南海海槽 2013年 降压法 6 d 20 000 120 000 表 4 极地国家与非极地国家天然气水合物研究动机及焦点
Table 4. Research motive and focus of gas hydrate in polar countries and non polar countries
国家 极地国家 非极地国家 挪威 俄罗斯 加拿大 美国 中国 德国 印度 日本 韩国 英国 国家研究计划 有 无 无 有 有 有 有 有 有 无 研究动机 能源供给安全 √ √ √ √ √ √ √ 环境/气候变化 √ √ √ √ √ 与其他项目合作 √ √ √ √ √ 研究焦点 能源评估 √ √ √ √ √ √ √ √ 生产模型和试验 √ √ √ √ √ √ 风险评估 √ √ √ √ √ √ 气候变化影响 √ √ √ √ √ √ 天然气储运 √ √ √ √ √ √ √ √ 二氧化碳封存 √ √ √ √ √ √ √ 参与机构 政府部门 √ √ √ √ √ √ √ √ √ √ 私人企业 √ √ √ √ √ √ 大学 √ √ √ √ √ √ √ √ √ √ -
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