CAJ | 학술논문

　　CO2深部咸水层地质封存被认为是减缓温室效应的一种有效的工程技术手段。针对神华鄂尔多斯105 t/a CO2捕集与封存(CCS)示范项目，用数值模拟方法对CO2在地层中的运移过程进行了详细地刻画，分析了CO2的流动迁移、地层压力积聚过程及地层封存潜力。数值模型不但可以为工程的顺利进行提供技术支撑，而且可以节省人力财力。首先，根据实际监测数据对模拟参数进行校准，得到了合适的压力拟合曲线，确定了主要的水文地质参数。然后，对为期3 a的CO2续注工程进行预测，详细分析了CO2的晕扩散、溶解情况、地层压力变化情况、储层封存潜力等。得到如下结论：CO2在3 a内的最大迁移距离约为350 m；水裂可以有效提高CO2的注入性；隔离层能有效防止CO2逃逸。研究表明，尽管鄂尔多斯盆地属于低渗咸水层仍然能够有效安全地封存CO2。
　　CO2심부함수층지질봉존피인위시감완온실효응적일충유효적공정기술수단。침대신화악이다사105 t/a CO2포집여봉존(CCS)시범항목，용수치모의방법대CO2재지층중적운이과정진행료상세지각화，분석료CO2적류동천이、지층압력적취과정급지층봉존잠력。수치모형불단가이위공정적순리진행제공기술지탱，이차가이절성인력재력。수선，근거실제감측수거대모의삼수진행교준，득도료합괄적압력의합곡선，학정료주요적수문지질삼수。연후，대위기3 a적CO2속주공정진행예측，상세분석료CO2적훈확산、용해정황、지층압력변화정황、저층봉존잠력등。득도여하결론：CO2재3 a내적최대천이거리약위350 m；수렬가이유효제고CO2적주입성；격리층능유효방지CO2도일。연구표명，진관악이다사분지속우저삼함수층잉연능구유효안전지봉존CO2。
The geological sequestration of CO2 in deep saline aquifer is an effective countermeasure for reducing global warming and greenhouse effect. Based on the Shenhua Ordos CO2 capture and storage (CCS) pilot project, the behavior of CO2 in deep saline aquifers is investigated. The transport process of CO2 fluid, the pressure buildup of system and the reserves potential of sequestration are analyzed. This model can provide technological support and save human and financial resources for Shenhua CCS engineering project. First, the model is calibrated by comparing simulated results and measured pressure values. The suitable pressure curve is obtained and the main hydrological parameters are determined at this stage. Then an assumption of CO2 continuing injection for 3 years is simulated based on the former model. The CO2 diffusion, solution behavior, pressure variation and total reserves of strata are analyzed. The conclusions are drawn as follows: the largest distance of CO2 migration is about 350 m; hydraulic fracturing can improve CO2 injectivity obviously; cap rock can effectively prevent the escape of CO2. Simulation results demonstrate that even though the deep saline aquifers of Ordos basin has low penetrability, it is also suitable for CO2 sequestration.