Abstract: In order to understand chemical characteristic of real solution of mud acid , a detail study on chemical reaction of HF on aluminaOsilicates during sandstone matrix acidizing has been carried out by using 　19 FNMR spectroscopy. Experimental results show that the chemical reaction of HF on aluminaOsilicates exists the second and the third reaction. The reaction of H2SiF6 on aluminaOsilicates gradually proceed until completely when the
formation temperature is over 60 ℃. The third reaction is more and more obviously , and the aluminum fluoride complexes are different in condition of 90 ℃. We can distinguish respective configuration of aluminum fluoride complexes and silicon fluoride complexes by using 　19 FNMR spectroscopy. The results of room experiments have provided the theory basis for field
treatment .
　

Key words: 19 FNMR, coreOf low test, sandstone matrix acidizing, the second reaction, the third reaction