Mechanisms and experimental research of ion-matched waterflooding to enhance oil recovery in carbonate reservoirs: A case of Cretaceous limestone reservoirs in Halfaya Oilfield, Middle East |
PENG Yingfeng,LI Yiqiang,ZHU Guangya,PAN Deng,XU Shanzhi,WANG Xiuyu |
Fig. 6. Activity coefficient difference curve of SO42- and Cl-. |