日本地球惑星科学連合2019年大会

講演情報

[J] 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-SC07] 地球温暖化防止と地学(CO2地中貯留・有効利用、地球工学)

2019年5月29日(水) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8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)

[HSC07-P04] Geological sequestration in saline carbonate formations: CO2-brine-rock interaction

*Shachi Shachi1Brijesh Kumar Yadav1Mohammad Azizur Rahman2Mayur Pal3 (1.Indian Institute of Technology Roorkee、2.Texas A&M University Qatar、3.North Oil Company, Qatar)

キーワード:Global warming, geo-sequestration, image analysis, mineralogical changes

To reduce unequivocal global warming due to continuous emission of greenhouse gas CO2 into atmosphere, geo-sequestration is one such emerging technology. For geologic sequestration, CO2 is injected into suitable deep subsurface formations at supercritical temperature and pressure conditions. Saline carbonate formations are one such promising sink due to its wide spread availability and enormous storage potential. In this study, a series of experiments have been performed on carbonate cores for finding out the effect of injected supercritical CO2 in subsurface formations. The laboratory study reported here investigated the cyclic injection of scCO2 and brine on two types (Edward White and Edward Yellow) of core samples under reservoir conditions. Further, the pre and post flooded carbonate core samples are analysed for mineralogical changes of CO2-brine-rock interaction using image analysis techniques such as FeSEM and EDX. The cyclic injection provides the differential pressure (DP) profile of the two samples with time, and is found to have increased with successive injection cycles. The FeSEM images showed that there was some dissolution and precipitation of minerals after the CO2 flooding emphasizing on solubility trapping and EDX provides the quantitative information about mineral compositions. The results are also compared for both porosity and permeability changes which are found to have decreased post scCO2 flooding. The results of this study provide vital information about mineralogical changes and thus will enhance the knowledge of implementing full scale CO2 sequestration in subsurface carbonate formations.