延长油田化子坪油区长6油层CO_2驱油与封存潜力分析
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摘要
为进一步探索CO_2捕集、利用与封存技术(CCUS)在延长油田化子坪油区长6油层应用的可行性,通过细管和长岩心驱油实验,分析了CO_2在长6油层的驱油潜力,从孔喉特征、渗流特征和力学特征三个方面对长4+5盖层的密封性进行综合评价的基础上,利用相关模型对CO_2封存潜力进行了分析。CO_2驱油和盖层密封性评价实验结果表明:延长油田化子坪油区长6油层CO_2驱为非混相驱,其在水驱基础上可进一步提高驱油效率28.83%,其中微孔隙、小孔隙、中孔隙和大孔隙的驱油效率分别提高33.25%、27.09%、26.71%和23.86%;长4+5盖层主要表现出中-小孔细喉道,束缚水饱和度极高,气相相对渗透率极低,突破压力和抗压强度高的特征,对CO_2地质封存具备良好的密封性。CO_2封存潜力分析结果表明:延长油田化子坪油区长6油层的CO_2有效封存量可达7.43×10~6t。
To further explore the feasibility of CO_2capture,utilization and storage(CCUS)technology in Chang 6 reservoir of Huaziping area,Yanchang Oilfield,the CO_2flooding potential of the Chang 6 reservoir was analyzed through slim tube and long core displacement experiments,and based on the comprehensive evaluation of sealing ability of Chang 4+5 caprock from three aspects of pore throat characteristics,seepage characteristics and mechanical characteristics,the CO_2storage potential of the Chang 4+5 caprock was analyzed by using relevant models.The results show that,CO_2flooding in Chang 6 reservoir of Huaziping area in Yanchang Oilfield is an immiscible flooding,which can further improve oil displacement efficiency by 28.83%on the basis of water flooding.The oil displacement efficiency of micro-pore,small-pore,medium-pore and macro-pore is increased by 33.25%,27.09%,26.71%and 23.86%respectively.The Chang 4+5 caprock is characterized by medium-small pore-fine throat,extremely high irreducible water saturation,extremely low relative gas permeability,high breakthrough pressure and high compressive strength,and it is of good sealing ability for the geological storage of CO_2.The analysis result of CO_2storage potential shows that the effective CO_2storage capacity of the Chang 6 reservoir in Huaziping area of Yanchang Oilfield can reach 7.43×10~6t.
To further explore the feasibility of CO_2capture,utilization and storage(CCUS)technology in Chang 6 reservoir of Huaziping area,Yanchang Oilfield,the CO_2flooding potential of the Chang 6 reservoir was analyzed through slim tube and long core displacement experiments,and based on the comprehensive evaluation of sealing ability of Chang 4+5 caprock from three aspects of pore throat characteristics,seepage characteristics and mechanical characteristics,the CO_2storage potential of the Chang 4+5 caprock was analyzed by using relevant models.The results show that,CO_2flooding in Chang 6 reservoir of Huaziping area in Yanchang Oilfield is an immiscible flooding,which can further improve oil displacement efficiency by 28.83%on the basis of water flooding.The oil displacement efficiency of micro-pore,small-pore,medium-pore and macro-pore is increased by 33.25%,27.09%,26.71%and 23.86%respectively.The Chang 4+5 caprock is characterized by medium-small pore-fine throat,extremely high irreducible water saturation,extremely low relative gas permeability,high breakthrough pressure and high compressive strength,and it is of good sealing ability for the geological storage of CO_2.The analysis result of CO_2storage potential shows that the effective CO_2storage capacity of the Chang 6 reservoir in Huaziping area of Yanchang Oilfield can reach 7.43×10~6t.
引文
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[2]刘雪雁,李鹏春,周蒂,等.南海北部珠江口盆地惠州21-1油田CO2-EOR与碳封存潜力快速评价[J].海洋地质前沿,2017,33(3):56-65.LIU Xueyan,LI Pengchun,ZHOU Di,et al. Quick assessment of CO2-EOR and sequestration potential in Huizhou21-1 oilfield,pearl river mouth basin,northern south China sea[J]. Marine Geology Frontiers,2017,33(3):56-65.
[3]谢健,魏宁,吴礼舟,等. CO2地质封存泄漏研究进展[J].岩土力学,2017(s1):181-188.XIE Jian,WEI Ning,WU Lizhou,et al. Progress in leakage study of geological CO2storage[J]. Rock and Soil Mechanics,2017(s1):181-188.
[4]刁玉杰,朱国维,金晓琳,等.四川盆地理论CO2地质利用与封存潜力评估[J].地质通报,2017,36(6):1088-1095.DIAO Yujie,ZHU Guowei,JIN Xiaolin,et al. Theoretical potential assessment of CO2geological utilization and storage in the Sichuan Basin[J]. Geological Bulletin of China,2017,36(6):1088-1095.
[5]张志雄,谢健,戚继红,等.地质封存二氧化碳沿断层泄漏数值模拟研究[J].水文地质工程地质,2018,45(2):109-116.ZHANG Zhixiong,XIE Jian,QI Jihong,et al. Numerical simulation of CO2leakage along faults from geologic carbon dioxide sequestration[J]. Hydrogeology&Engineering Geology,2018,45(2):109-116.
[6]任相坤,崔永君,步学朋,等.鄂尔多斯盆地CO2地质封存潜力分析[J].中国能源,2010,32(1):29-32.REN Xiangkun,CUI Yongjun,BU Xuepeng,et al. CO2geological sequestration potential analysis in Ordos basin[J]. China Energy,2010,32(1):29-32.
[7]吾尔娜,吴昌志,季峻峰,等.松辽盆地徐家围子断陷玄武岩气藏储层的CO2封存潜力研究[J].高校地质学报,2012,18(2):239-247.WU Erna,WU Changzhi,JI Junfeng,et al. Potential capacity and feasibility of CO2sequestration in petroleum reservoirs of basaltic rocks:example from basaltic hydrocarbon reservoir in the Xujiaweizi fault depression the Songliao basin,east China[J]. Geological Journal of China Universities,2012,18(2):239-247.
[8]段鹏飞.河东煤田CO2煤层地质封存条件及潜力评价[J].中国煤炭地质,2015,27(10):1-5.DUAN Pengfei. Coal seam CO2geological sealing condition and potential evaluation in Hedong coalfield[J]. Coal Geology of China,2015,27(10):1-5.
[9]赵晓亮,廖新维,王万福,等.二氧化碳埋存潜力评价模型与关键参数的确定[J].特种油气藏,2013,20(6):72-74.ZHAO Xiaoliang,LIAO Xinwei,WANG Wanfu,et al.Evaluative model of CO2geological sequestration and determination of key parameters[J]. Special Oil and Gas Reservoir,2013,20(6):72-74.
[10]姚素平,汤中一,谭丽华,等.江苏省CO2煤层地质封存条件与潜力评价[J].高校地质学报,2012,18(2):203-214.YAO Suping,TANG Zhongyi,TAN Lihua,et al. The CO2geological sealing conditions and potential evaluation in coal sea ms in Jiangsu province[J]. Geological Journal of China Universities,2012,18(2):203-214.
[11]郎东江,伦增珉,吕成远,等.致密砂岩储层CO2驱油特征的核磁共振实验研究[J]. CT理论与应用研究,2016,25(2):141-147.LANG Dongjiang,LUN Zengmin,LYU Chengyuan,et al.Study of displacement characteristics of CO2in tight sandstone reservoir by nuclear magnetic resonance[J]. CT Theory and Applications,2016,25(2):141-147.
[12]韦青,李治平,白瑞婷,等.微观孔隙结构对致密砂岩渗吸影响的试验研究[J].石油钻探技术,2016,44(5):109-116.WEI Qing,LI Zhiping,BAI Ruiting,et al. An experimental study on the effect of microscopic pore structure on spontaneous imbibition in tight sandstones[J]. Petroleum Drilling Techniques,2016,44(5):109-116.
[13]白松涛,程道解,万金彬,等.砂岩岩石核磁共振T2谱定量表征[J].石油学报,2016,37(3):382-391.BAI Songtao,CHENG Daojie,WAN Jinbin,et al. Quantitative characterization of sandstone NMR T2spectrum[J].Acta Petrolei Sinica,2016,37(3):382-391.
[14]郭晨,秦勇,杨兆彪,等.黔西比德一三塘盆地煤储层NMR T2谱及气水相渗特征与控制因素[J].中国矿业大学学报,2014,43(5):841-852.GUO Chen,QIN Yong,YANG Zhaobiao,et al. Coal reservoir NMR T2spectrum&gas-water relative permeability characteristics and their controlling factors in Bide-santang basin,western Cuizhou[J]. Journal of China University of Mining&Technology,2014,43(5):841-852.
[15]许长福,刘红现,钱根宝,等.克拉玛依砾岩储集层微观水驱油机理[J].石油勘探与开发,2011,38(6):725-732.XU Changfu,LIU Hongxian,QIAN Genbao,et al. Microcosmic mechanis ms of water-oil displacement in conglomerate reservoirs in Karamay Oilfield,NW China[J]. Petroleum Exploration and Development,2011,38(6):725-732.
[16]李道品.低渗透油田开发[M].北京:石油工业出版社,1999,8-10.LI Daoping. Low Permeability Oilfield Development[M].Beijing:Petroleum Industry Press,1999,8-10.
[17]薛海涛,卢双舫,付晓泰.甲烷、二氧化碳和氮气在油相中溶解度的预测模型[J].石油与天然气地质,2005,26(5):444-449.XUE Haitao,LU Shuangfang,FU Xiaotai,et al. Forecasting model of solubility of CH4,CO2and N2in crude oil[J].Oil&Gas Geology,2005,26(5):444-449.
[18]BACHU S,BONIJOLY D,BRADSHAW J,et al. CO2storage capacity estimation:methodology and gaps[J]. International Journal of Greenhouse Gas Control,2007,1(4):430-443.
[19]BRADSHAW J,BACHU S,BONIJOLY D,et al. CO2storage capacity estimation:issues and development of standards[J]. International Journal of Greenhouse Gas Control,2007,1(1):62-68.
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