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현무암 내 CO2 수용액 주입에 따른 탄소 광물화 및 암석 물성 변화에 관한 코어 규모 모델링 및 시뮬레이션 연구

Core-Scale Modeling and Simulation Study on Carbon Mineralization and Rock Property Changes Induced by CO2 Solution Injection into Basalt

권태혁|서정규|김호상|안영빈|민배현|윤소은
한국자원공학회 (The Korean Society of Mineral and Energy Resources Engineers)|2024.12|한국자원공학회지 (Journal of the Korean Society of Mineral and Energy Resources Engineers)|제61권 제6호|pp. 480-499|DOI 10.32390/ksmer.2024.61.6.480

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키워드

basalt현무암CO2 storageCO2 지중저장탄소 광물화CO2 수용액지화학 반응carbon mineralizationCO2 solutiongeochemical reactions
주제분류자원공학

초록

본 연구는 현무암 코어에 CO2 수용액을 주입할 때 발생하는 탄소 광물화 반응을 모델링 하고 시뮬레이션하여 현무암 CO2 지중저장의 효율성을 분석하였다. CO2 수용액과 광물 간의 지화학적 상호작용을 바탕으로 탄산염 침전과 현무암 용해 과정을 모사하고, 이를 통해 공극률 변화를 추정하였다. 또한, power-law 수식을 활용하여 공극률과 유체투과율 간의 상관관계를 나타냄으로써 수용액 주입 과정에서 발생하는 압력 변화를 계산하였다. 철원 분지 현무암 코어에 CO2 수용액을 주입한 실험 결과와 비교하여, 탄산염 침전량, 공극률, 유체투과율, 압력 변화 등 네 가지 측면에서 시뮬레이션 결과를 검증하고 모델의 신뢰성을 평가하였다. 철원 및 제주 현무암 시료와 사암 시료를대상으로 시뮬레이션 기반 민감도 분석을 통해 CO2 수용액 유형과 광물 조성이 탄소 광물화 반응에 미치는 영향을 조사하였다. 본 연구의 모델링 및 시뮬레이션 방법은 국내외 현무암 CO2 지중저장의 탄소감축 및 광물화 효율 분석을 위하여 범용적으로 활용 가능하다.

Abstract

This study analyzed the effectiveness of CO2 storage in basalt by simulating carbon mineralization during the injection of a CO2 solution into basalt cores. Porosity changes were assessed by modeling carbonate precipitation and basalt dissolution based on geochemical reactions. The correlation between the porosity and permeability was examined using the power-law equation to calculate the change in pressure during injection. The simulation results were validated by comparing the experimental data acquired from the Cheorwon region with respect to carbonate precipitation, porosity, permeability, and pressure difference. A sensitivity analysis was performed to examine the effects of CO2 solution type and mineral composition on carbon mineralization using basalt samples from Cheorwon and Jeju as well as sandstone sample. The modeling and simulation methods used in this study can be applied to analyze the carbon reduction and mineralization trapping of the CO2 stored in basalt formations.

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