离岸咸水层CO_(2)封存羽流运移识别的海洋可控源电磁法响应特征  

Sensitivity of marine controllable source electromagnetic sounding for monitoring plume migration in offshore CO_(2)sequestration in saline aquifers

作　　者：潘春梧 邱宁 张永恒 路川岳 刘彬[1,3] 孙珍 PAN Chunwu;QIU Ning;ZHANG Yongheng;LU Chuanyue;LIU Bin;SUN Zhen(Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Sanya Institute of Ocean Eco-Environmental Engineering,Key Laboratory of Tropical Oceanography,Chinese Academy of Sciences,Guangzhou 511458,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院边缘海与大洋地质重点实验室,南海海洋研究所,三亚海洋生态环境工程研究院,热带海洋环境与岛礁生态全国重点实验室,广州511458 [2]南方海洋科学与工程广东省实验室(广州),广州511458 [3]中国科学院大学,北京100049

出　　处：《环境工程学报》2025年第1期225-240,共16页Chinese Journal of Environmental Engineering

基　　金：广东省重大人才工程项目(2019BT02H594);三亚市科技创新专项(2022KJCX08);广东南方碳捕集与封存产业中心开放基金(GDCCUS202203)。

摘　　要：离岸碳封存选取的深部咸水层储层通常具有高孔高渗特点,离岸咸水层二氧化碳(CO_(2))封存越来越受到学术界和企业的关注。研究发现,地震波速度随CO_(2)饱和度变化在超过一定界限时并不显著,常规的地震勘探方法对于CO_(2)封存中羽流运移监测存在挑战,而电阻率在咸水层CO_(2)注入后会表现较明显响应。为了解海洋可控源电磁法(CSEM)对监测咸水层CO_(2)运移情况的响应特征,通过CSEM模拟深部咸水层中不同的CO_(2)封存羽流运移情况(不同注入量或扩散长度、埋深等),考虑使用不同发射频率情况下的电场响应特点。研究CSEM电场在3个不同方向上的幅值和相位随偏移距的变化特点,以及对各模型电阻率成像结果对比分析。实验结果显示CSEM数据具有较好的灵敏度和分辨率,具有监测深部咸水层CO_(2)羽流运移情况的潜力。离岸咸水层CO_(2)封存的电磁响应特征研究,不仅可以为离岸CO_(2)封存羽流运移机制研究提供参考,还为CSEM在碳封存监测工作中的评价提供依据。The saline aquifer selected for offshore carbon sequestration are usually characterized by high porosity and high permeability.Carbon dioxide(CO_(2))sequestration in offshore saltwater reservoirs has attracted more and more attention from academia and enterprises.It is found that the change of seismic wave velocity with CO_(2)saturation is not significant when it exceeds a certain limit.Conventional seismic exploration methods are challenging for plume migration monitoring in CO_(2)storage.However,the resistivity of saline aquifer is more responsive after CO_(2)injection.In order to study the response characteristics of marine controlled source electromagnetic method(CSEM)to the monitoring of CO_(2)migration in the salt water layer.In this study,CSEM was used to simulate the transport of various CwaO2 sequestrated plumes(injection amount or diffusion length,buried depth,etc.)in saline aquifer.Considering the electric field response characteristics under different emission frequencies.To study the variation characteristics of the amplitude and phase of CSEM electric field in three different directions with the offset,and to compare and analyze the resistivity imaging results of each model,the results of resistivity imaging were compared and analyzed.The results showed that marine CSEM had good sensitivity and resolution,and had the potential to monitor the CO_(2)plume migration in the deep saline aquifer.The study on the electromagnetic response characteristics of CO_(2)sequestration in offshore deep saline aquifer can not only provide a reference for the study on the migration mechanism of offshore CO_(2)sequestration plume,but also provide a basis for the evaluation of marine CSEM in offshore CO_(2)sequestration monitoring.

关 键 词：离岸CO_(2)封存 注入量 海洋可控源电磁法 羽流运移 监测 

分 类 号：X523[环境科学与工程—环境工程]