黄土塬地区CO_(2)驱油封存泄漏地下水监测体系研究  

DEVELOPMENT OF A GROUNDWATER MONITORING SYSTEM FOR CO LEAKAGE OF CO_(2)-EOR STORAGE IN LOESS TABLELAND REGION

作　　者：王昊 林千果 郭军红 汤沭成 王维波 梁希 李飒[1,2] 段晓雅 WANG Hao;LIN Qian-guo;GUO Jun-hong;TANG Shu-cheng;WANG Wei-bo;LIANG Xi;LI Sa;DUAN Xiao-ya(College of Environment Science and Engineering,North China Electric Power University,Beijing 102206,China;Suzhou Institute of North China Electric Power University,Suzhou 215123,China;Shaanxi Yanchang Petroleum(Group)Corp.Ltd.Research Institute,Shaanxi,Xi’an 710075,China;University of Edinburgh,Business School,Edinburgh EH89JS,UK)

机构地区：[1]华北电力大学环境科学与工程学院,北京102206 [2]华北电力大学苏州研究院,江苏苏州215123 [3]陕西延长石油(集团)有限责任公司研究院,西安710075 [4]英国爱丁堡大学商学院,英国爱丁堡EH89JS

出　　处：《环境工程》2021年第8期217-226,共10页Environmental Engineering

基　　金：国家重点研发计划项目(2018YFB0605504)。

摘　　要：针对鄂尔多斯黄土塬地区CO_(2)驱油封存项目的监测需求,在综合辨识黄土塬地区地下水潜在的CO_(2)泄漏特征,剖析CO_(2)泄漏进入地下含水层后的空间运移及时间响应特征的基础上,结合CO_(2)驱油封存过程,建立了1套面向黄土塬地区CO_(2)驱油封存CO_(2)泄漏的全时空立体化地下水监测体系。研究表明:受地形地貌及土壤特点影响,黄土塬地区驱油封存的CO_(2)具有盖层突破、井筒侧漏、降雨反渗和地表径流补给的多源泄漏特征;CO_(2)泄漏进入地下含水层后具有纵向快速运移扩散、横向四周缓慢扩散并随地下水向下游运移的空间运移特征和CO_(2)浓度、电导率等指标上升,pH值下降以及Ca2+、Mg2+离子浓度先上升后下降的时间响应特征。基于上述特征所建立的监测体系可为该区域CO_(2)驱油封存示范项目的监测提供参考。In view of the lack of literature in monitoring of CO_(2) leakage into groundwater and the demand of the monitoring of CO_(2)-EOR and storage projects in the Loess Tableland Region in the Ordos Basin, in this study, based on comprehensive characterization of the potential CO_(2) leakage into groundwater and identification of the spatial migration and time response characteristics of CO_(2) leakage into groundwater, a full-time and three-dimensional monitoring system was established for monitoring CO_(2) leakage into groundwater associated with CO_(2)-EOR process in Loess Tableland Region. The result indicated that, affected by topography and soil characteristics, the potential CO_(2) leakage into groundwater featured with multiple leakage sources, including caprock breakthrough, shaft side leakage, rainfall infiltration and surface runoff recharge. The migration of CO_(2) leaked into the groundwater were characterized with quick diffusion in the vertical direction, slowly spread out in the horizontal direction, and movement along with water flow to downstream. The time response characteristics were also identified with seven indicators to CO_(2) leakage into groundwater, such as the increase of CO_(2) concentration, conductivity, HCO-3 concentration, temperature and pressure, the decrease of pH value and the variation of Ca2+ and Mg2+ concentrations. The developed monitoring system reflecting above characteristics could provide solid support for the monitoring of CO_(2)-EOR and storage in Loess Tableland Region.

关 键 词：CO_(2)驱油封存 黄土塬 CO_(2)泄漏 地下水监测体系 

分 类 号：P641[天文地球—地质矿产勘探] TE357.7[天文地球—地质学]