西安石油大学：《油藏物理（油层物理学）Petro-physics》精品课程教学资源（英文课件）Physics property of reservoir rock 1.7 Research on sensitivity of reservoir rock 储层岩石的敏感性研究

salt sensitivity higher salinity water result that ion recrystallizate and rock permeability decrease

salt sensitivity higher salinity water result that ion recrystallizate and rock permeability decrease

acid sensitivity When acid is injected into reservoir,acid react with mineral of rock produce precipitation and rock permeability decrease greatly. Example:chlorite,pyrite(FeS),iron carbonate

acid sensitivity When acid is injected into reservoir, acid react with mineral of rock produce precipitation and rock permeability decrease greatly. Example: chlorite, pyrite(FeS), iron carbonate

occur chemical reaction: 3FO.Al,O3·2SiO2·3HO+6HC1=3FCl,+2Al(OH)3 +2Si02·3H20 4FeCl +6H2O+302 =4Fe(OH):+4Cl

SiO H O FeO Al O SiO H O HCl FeCl Al OH 2 2 2 3 2 2 2 3 2 3 3 2 3 6 3 2 ( )         2 2 2 3 4 2 4FeCl  6H O  3O  4Fe(OH)   Cl occur chemical reaction: