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In order to solve problems associated with acidizing the oil reservoir in K 1 S 2 «Tuha» oilfield, the paper analyses the petrologic feature of the reservoir stratum and the character of the clay mineral based on the special geologic feature of the reservoir stratum. The rock samples consist of different minerals and have been chosen to react with 15%HCl, 12%HCl+3%HF and 10%HF+8%HBF 4 . The mechanism of acid sensitivity has been evaluated. Results show a medium to strong acid sensitivity fordoi:10.5510/ogp20140300211 fatcat:kstell7t7befra6efti6b6ekry