Investigation of Electrical Parameters of Fresh Water and Produced Mixed Injection in High-Salinity Reservoirs

查看全文 作　　者：Jun [1]Li;Guofeng [2]Cheng;Hongwei [3]Xiao;Xiang [4]Li;Lizhi [4]Wang;Hui [5]Xu;Yu [6]Wang;Nannan [5]Liu;Shangping [5]Chen;Xing [5]Shi 机构地区：[1]PetroChina Research Institute of Petroleum Exploration&Development,Beijing,100083,China;[2]Changqing Oilfield No.5 Oil Production Plant,PetroChina,Xi’an,710000,China;[3]Exploration and Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing,163712,China;[4]Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources of the People’s Republic of China,Beijing,100195,China;[5]Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology,School of Petroleum and Natural Gas Engineering,Changzhou University,Changzhou,213164,China;[6]Sinopec International Petroleum Exploration and Production Corporation,Beijing,100029,China 出　　处：《Fluid Dynamics & Materials Processing》索引2023年第19卷第10期,共12页 基　　金：The authors would like to acknowledge the financial support from the Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology(Grant No.CDYQCY202201);funded by the Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources of the People’s Republic of China.The authors thank the anonymous reviewers for their constructive and valuable opinions gratefully. 摘　　要：Assuming a reservoir with a typical salt-lake background in the Qaidam Basin as a testbed,in this study the var-iation law of the rock electrical parameters has been determined through water displacement experiments with different salinities.As made evident by the results,the saturation index increases with the degree of water injec-tion.When the salinity of the injected water is lower than 80000 ppm,the resistivity of the rock samplefirst decreases,then it remains almost constant in an intermediate stage,andfinally it grows,thereby giving rise to a‘U’profile behavior.As the salinity decreases,the water saturation corresponding to the inflection point of the resistivity becomes lower,thereby leading to a wider‘U’type range and a higher terminal resistivity.For dif-ferent samples,higher initial resistivity of the sample in the oil-bearing state,and higher resistivity after low-sali-nity water washing are obtained when a thicker lithology is considered. 关 键 词：High salinity reservoir mixed injection saturation index RESISTIVITY electrical parameters