The diagenetic facies and its control over physical property of Chang6 reservoir in Huachi, Ordos Basin
WANG Yong-dong1,2, ZHANG Chuang3, XU Gang2, XIA Hai-ying2, WEN Liang2
(1 School of Resources and Environment Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China; 2 Zichang Oil Extraction Factory, Shaanxi Yanchang Petroleum (Group) Co.LTD, Yan′an 716003, Shaanxi, China;3 Department of Geology, Northwest University, Xi′an 710065, Shaanxi,China）
Abstract:
Based on reservoir characteristic analysis and diagenesis research, diagenetic facies of Chang6 reservoir in Huachi, is classified, and its control over physical property is studied.Chang6 reservoir mainly experienced compaction, pressolution, carbonate cementation, clay mineral cementation, siliceous cementation and feldspar dissolution.According to the different diagenesis characteristics, the diagenetic facies can be classified into four types, which are chlorite rim facies, feldspar dissolution facies, illite-filling facies, and carbonate dense cementation facies. Because of the different diagenesis characteristics and petrologic make-up in four diagenesis facies, the types and distribution of pores and pore-throats are different. Furthermore, their physical properties are different, of which chlorite rim facies is best, and illite-filling facies, and carbonate dense cementation facies is worst.
KeyWords:
diagenetic facies; physical property; chlorite rim; control over
