盐水层CO_(2)稳定埋存效率及储层参数优化  

CO_(2) stable storage efficiency in saline aquifers and reservoir parameters optimization

作　　者：崔传智[1] 张团 张传宝 吴忠维 李弘博 韩文成 CUI Chuanzhi;ZHANG Tuan;ZHANG Chuanbao;WU Zhongwei;LI Hongbo;HAN Wencheng(MOE Key Laboratory of Unconventional Oil&Gas Development,China University of Petroleum,Qingdao 266580,China;Exploration and Development Research Institute of Sinopec Shengli Oilfield Company,Dongying 257015,China)

机构地区：[1]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《大庆石油地质与开发》2023年第3期141-147,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“致密油藏多段压裂水平井时空耦合流动模拟及参数优化方法”(51974343);中石化胜利油田项目“胜利油区含水层CO_(2)埋存潜力及技术研究”(30200018-21-ZC0613-0131)。

摘　　要：CO_(2)埋存是应对“碳达峰”和“碳中和”最为有效的埋存方式,为了筛选适合CO_(2)长期稳定埋存的盐水层,考虑了CO_(2)在盐水层中的4种埋存方式,建立了评价盐水层CO_(2)稳定埋存效率综合表征指标,并且基于数值模拟与Pearson (皮尔逊)相关系数统计的方法,确定影响盐水层CO_(2)稳定埋存效率的主控因素为储层底层与顶层渗透率的比值、储层中部渗透率和温度,在此基础上进行了盐水层CO_(2)稳定埋存储层参数优化。研究结果表明:反韵律储层有利于盐水层CO_(2)的稳定埋存,且储层底层与顶层渗透率的比值为1/7时,稳定埋存效率综合表征指标较大,盐水层CO_(2)稳定埋存潜力较大;当储层温度为55℃时,稳定埋存效率综合表征指标达到较高水平;随着渗透率的增大,稳定埋存效率综合表征指标先增大后减小,渗透率为0.8μm^(2)时,盐水层CO_(2)稳定埋存潜力较大;因此,确定反韵律储层渗透率级差为7、储层渗透率为0.8μm^(2)、储层温度为55℃时的储层更适合CO_(2)的稳定埋存。研究成果为盐水层CO_(2)稳定埋存储层筛选提供了依据。CO_(2) storage is the most effective way to deal with“carbon peaking”and“carbon neutrality”.In order to select saline aquifers suitable for long-term stable storage of CO_(2),4 storage methods of CO_(2) in saline aquifers are considered,and comprehensive characterization indexes are established to evaluate stable storage efficiency of CO_(2) in saline aquifers.Based on the method of numerical simulation and Pearson correlation coefficient statistics,it is determined that the main factors affecting stable storage efficiency of CO_(2) in saline aquifers are bottom-top permeability ratio,permeability of middle part of reservoir and temperature.On this basis,the parameters of CO_(2) stable storage layer in saline aquifers are optimized.The study shows that reverse rhythm reservoir is conducive to stable storage of CO_(2) in saline aquifers.When bottom-top permeability ratio of reservoir is 1/7,the comprehensive characterization index of stable storage efficiency is high,with much potential of stable CO_(2) storage in saline aquifers.When the temperature is 55℃,the comprehensive characterization index of stable storage efficiency reaches a high level.With the increase of permeability,the comprehensive characterization index of stable storage efficiency first increases and then decreases.When the permeability is 0.8μm^(2),the stable storage potential of CO_(2) in saline aquifers is large.Therefore,it is determined that reservoir with reverse rhythm permeability contrast of 7,reservoir permeability of 0.8μm^(2) and reservoir temperature of 55℃is more suitable for stable storage of CO_(2).The study provides basis for screening of stable storage layer of CO_(2) in saline aquifers.

关 键 词：盐水层 CO_(2)稳定埋存 稳定埋存效率 Pearson相关系数 主控因素 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]