权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Experimental Study on Disposition of Carbon Dioxide in Deep Stratum and Seabed

深部及海底二氧化碳处置实验研究

基本信息

批准号：
17560723
负责人：
MIZUKAMI Masakatsu
金额：
$ 1.54万
依托单位：
Hakodate National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

In order to obtain fundamental data for disposition of carbon dioxide in deep stratum and seabed, we carried out the following experiments.(1) Liquid carbon dioxide, granodiorite and ground water were sealed into Barnes-type hydrothermal system and heated to 150℃ at 100bar. Sample solutions were collected at intervals and analyzed by AA, ICP-MS and ion-chromatography. The rock after the reaction was analyzed by X-ray, SEM and EPMA. The results of analysis showed that calcium decreased rapidly in the experimental solution indicating calcium carbonate precipitated in the system. This suggests that carbon dioxide can be fixed in deep heated stratum as calcium carbonate.(2) The experimental results were compared with the data of a field test which was carried out at Okachi thermal area in Akita Prefecture. In the field test solid carbon dioxide was put with ground water into a 1000m-deep drill hole in granodiorite heated at 200℃. The chemical change of the solutions from the field test well accord with the experimental data of this study.(3) In order to understand the effect of carbon dioxide to seawater composition, carbonate ion was reacted with seawater in laboratory and precipitates were analyzed by EPMA. With increasing carbonate concentration in seawater dolomite or Mg-rich calcite were quickly precipitated, suggesting that carbonate ion affect seawater composition strongly.The results of this study would be effective to make technical progress in carbon dioxide disposition to deep stratum and seabed.

为了获得二氧化碳在深层和海底处置的基础数据，我们进行了以下实验。(1)将液态二氧化碳、花岗闪长岩和地下水封入Barnes型热液体系，在100 bar下加热至150℃。定期采集样品溶液，并通过AA、ICP-MS和离子色谱法进行分析。对反应后的岩石进行了X射线衍射、扫描电镜和电子探针分析。分析结果表明，实验溶液中钙迅速减少，表明碳酸钙在体系中沉淀。这表明二氧化碳可以以碳酸钙的形式固定在深部热地层中。(2)将实验结果与在秋田县冈知热区进行的现场试验数据进行了比较。现场试验是在200℃加热的花岗岩中，将固体二氧化碳与地下水一起注入1000米深的钻孔中。现场试验井雅阁的化学变化与本研究的实验数据相吻合。(3)为了解CO2对海水成分的影响，在实验室条件下，将碳酸根离子与海水反应，并对沉淀物进行电子探针分析。随着海水中碳酸盐浓度的增加，白云石或富镁方解石快速沉淀，说明碳酸盐离子对海水成分有很强的影响，本研究结果将有效推动CO2向深层和海底处置的技术进步。