ZHAO Xiao-dong1,2, YANG Shao-chun1, ZHONG Si-ying3, LIU Jing-hua3, WEN Ya-ru1, Lan Zhi-qin1
（1. School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2. Exploration and Development Research Institute, Jidong Oilfield Company, CNPC, Tangshan 064300, China;
3. Geology Research Institute, Jiangsu Oilfield, Sinopec, Yangzhou 225012, China)
Abstract: Using the water injection oilfield—Zhenwu oil field in the northern Jiangsu basin as example, this study using X-ray analysis, SEM and observational experimentation, this study discusses the clay mineral characteristics of the micro and macro changes in the water flooding process, analysis of the clay particles in the water reservoir way migration, and estimation of grain-size of the clay minerals. Results indicate that with the gradual deepening degree of development a decrease of the relative content of mixed-layer illite and an increase of kaolinite, while illite and chlorite are almost invariant. The mechanical infiltration plays the main role of migration. The migration of clay minerals is principally restricted by pore width. A further estimation of minimum pore width of the clay minerals is 20μm. The transformation of the clay minerals changes pore structure. It was observed that coarse pores become smoother while fine pores become coarser, thus affecting the form of remaining oil in the late period of oilfield development.
Key words: clay minerals; mixed-layer illite ; kaolinite; remaining oil; water injection
E-mail：zhaoxiaodong1984_1@126.com
ACTA MINERALOGICA SINICA Vol. 34, No. 4, 2014, Page 591-598
