盐水层温室气体地质埋存机理及潜力计算方法评价  

Greenhouse Gas Geo-Sequestration Mechanism and Capacity Evaluation in Aquifer

作　　者：杨永智[1] 沈平平[1] 宋新民[1] 杨思玉[1] 胡永乐[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《吉林大学学报（地球科学版）》2009年第4期744-748,共5页Journal of Jilin University：Earth Science Edition

基　　金：国家'973'项目(2006CB705801)

摘　　要：针对盐水层CO2地质埋存评价要求,提出了盐水层CO2埋存机理以及埋存潜力计算方法。CO2在盐水层中的埋存机理包括水力圈闭、残余气圈闭、溶解埋存和矿物埋存等4种基本方式。水力圈闭是CO2向上运动到达致密隔层受到遮挡后,在地质体中聚集,形成CO2气相埋存;残余气圈闭是由于驱替和吸吮相渗滞后现象存在,部分CO2以残余气形式被圈闭;溶解埋存是CO2溶解在水中,与水中的钙、镁、铁等离子发生反应生成碳酸盐矿物,实现CO2圈闭;矿物埋存是CO2与储层岩石发生缓慢的化学反应,形成碳酸盐矿物或HCO3-实现CO2封存。各种埋存方式随埋存时间不同,发挥的作用不一样,埋存安全性级别各不相同。埋存潜力只由残余气圈闭和溶解圈闭两部分构成。在此基础上,提出了埋存潜力计算公式及参数确定方法。埋存机理及潜力计算方法的提出为盐水层目标区CO2地质埋存评价提供了方法基础。In order to meet the need of evaluatoin of CO2 geo-sequestration in deep aquifer, CO2 sequestration mechanisms and capacity evaluation in deep aquifer is proposed. The CO2 sequestration mechanism includes four main ways. （a）hydrodynamic trapping means a CO2 migration upwards to the barrier layer and gathered in geologic masses, forming a CO2 gas phase sequestration; （ b） residual gas trapping results from relative permeability hysteresis, （c）solubility trapping means CO2 dissolves in the formation water and （d）mineral trapping is CO2 sequestration through geochemical reactions with the aquifer fluids and rocks. Mechanisms for sequestration of CO2 operate on different time scales and have different degrees of permanency. The ultimate CO2 sequestration capacity in an aquifer can be defined as the total amount of CO2 that can trap in solubility and residual gas. On the base of mechanism analysis, the formula on sequestration capacity can be deduced to evaluate sequestration capacity. Sequestration evaluation for a target site can be made based on mechanism and capacity formula.

关 键 词：温室气体减排 盐水层 CO2埋存 埋存机理 埋存潜力 

分 类 号：X701[环境科学与工程—环境工程]