CAJ | 학술논문

CO2地质封存可以减少化石燃料燃烧排放的CO2量,有效减缓温室效应.储层渗透率可以决定CO2通道的形成,进而改变其在储层中的运移规律,因而是影响CO2地质封存的重要因素.根据研究区基本地质数据、三维地震勘探结果和统计规律确定了渗透率的分布情况,运用储层多相流模拟软件TOUGH2-MP分析了渗透率的非均质性对CO2地质封存的影响.结果表明：（1）渗透率的分布情况对CO2储存量和注入压力的影响很大,相比于均值模型,CO2的注入总量明显减少,到达最大允许压力积聚所需的时间要比均质模型短;（2）在保证注入速率和压力积聚不超过允许最大值的双重要求下,定压和定量两种注入方案都有待改进,建议考虑如人工压裂等工程措施;（3）渗透率的非均质性使得CO2晕呈现出不规则扩散,经过20年的注入,其最大扩散距离约800m,比均质情况下小150m,须做好相应的监测工作.
CO2지질봉존가이감소화석연료연소배방적CO2량,유효감완온실효응.저층삼투솔가이결정CO2통도적형성,진이개변기재저층중적운이규률,인이시영향CO2지질봉존적중요인소.근거연구구기본지질수거、삼유지진감탐결과화통계규률학정료삼투솔적분포정황,운용저층다상류모의연건TOUGH2-MP분석료삼투솔적비균질성대CO2지질봉존적영향.결과표명：（1）삼투솔적분포정황대CO2저존량화주입압력적영향흔대,상비우균치모형,CO2적주입총량명현감소,도체최대윤허압력적취소수적시간요비균질모형단;（2）재보증주입속솔화압력적취불초과윤허최대치적쌍중요구하,정압화정량량충주입방안도유대개진,건의고필여인공압렬등공정조시;（3）삼투솔적비균질성사득CO2훈정현출불규칙확산,경과20년적주입,기최대확산거리약800m,비균질정황하소150m,수주호상응적감측공작.
Geological sequestration of CO2 helps reduce the volume of CO2 emissions from the combustion of fossil fuels,and may help reduce global warming. The distribution of permeability may determine the formation of CO2 migration paths,thereby changing the underground migration of CO2. Permeability distributions in the model area are determined basedon hydrogeological conditions observed in Ordos Basin and three-dimensional seismic exploration results at the site. Thenumerical model is run with TOUGH2-MP software to analyze the impacts of heterogeneous permeability on CO2 storage.Model results lead to three main conclusions. Firstly, the distribution of permeability is of great importance to CO2 storagecapacity and injection pressure. Compared with the homogeneous model, CO2 injection volume in the heterogeneous modeldecreased significantly, as did the time required to reach the maximum allowable pressure. Secondly, injection schemesmay need to be improved in cases when there is a required injection rate and maximum allowable pressure build-up. As aconsequence, appropriate engineering treatments, such as hydraulic fracturing, are recommended. Third, heterogeneouspermeability makes CO2 plumes appear irregular and annular in shape. After 20 years of injections, the CO2 migrationdistance reached 800 m in the heterogeneous model, compared with only 150 m in the homogeneous model. This studyhighlights the needs for proper monitoring of geological CO2 sequestration.