日本地球惑星科学連合2018年大会

講演情報

[JJ] ポスター発表

セッション記号 H (地球人間圏科学) » H-SC 社会地球科学・社会都市システム

[H-SC05] 地球温暖化防止と地学(CO2地中貯留・有効利用、地球工学)

2018年5月23日(水) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:徂徠 正夫(国立研究開発法人産業技術総合研究所地圏資源環境研究部門)、薛 自求(公益財団法人 地球環境産業技術研究機構)、愛知 正温(東京大学大学院新領域創成科学研究科)

[HSC05-P03] 光ファイバーによるCO2圧入の検知; 長尺コア試料の例

*朴 赫1Jiang Lanlan1Zhang Yi1木山 保1薛 自求1 (1.公益財団法人 地球環境産業技術研究機構)

キーワード: 光ファイバー計測、X線CT、CO2フラッド、CO2飽和度

We challenged the detection of CO2 by optical fiber in a laboratory experiment using porous sandstone. We also observed the fluid movement in the specimen by performing CT image analysis at the same time. It is possible to obtain the specimen porosity and fluid saturation process by using CT image analysis. Berea sandstone (diameter: 34.85mm, length: 288mm) was used in this study. Porosity of specimen determined by X-ray CT imaging is 19.70%. This specimen has thin layers parallel to the specimen axis, and the permeability is about 130 mD. The experiment was conducted under the pressure and temperature conditions that simulate underground environments; pore pressure: 10MPa, temperature: 40 degrees Celsius. The confining pressure selected in this study is 15MPa. The specimen was first saturated with KI aqueous solution (11.5 wt%). For the CO2 flooding, we maintained the upstream CO2 injection rate at 0.05 mL/min. The CO2 flooding was carried out until the total fluid injection reaches about 3PV (pore volume). Optical fiber measurement and X-ray CT imaging were performed in all experimental steps. Figure shows the detection results of CO2 in optical fiber measurement and X-ray CT imaging. According to the results, the movement of CO2 detected by optical fiber measurement is in good agreement with that obtained by X-ray CT. This suggests that optical fiber measurement is effective for detecting the movement of CO2 in the rock.