A method of treating a formation containing crude oil with specific solubility groups and chemical families which is a crude oil which has an asphaltenes to resin weight ratio of at most 0.5, a saturates to aromatics weight ratio of at most 0.7 and a naphthenic acid concentration of at most 1900 ppm, said method comprising: (a) providing a hydrocarbon recovery composition to at least a portion of the crude oil containing formation, wherein the composition comprises a C 24-28 internal olefin sulfonate and another internal olefin sulfonate selected from the group consisting of C 15-18 internal olefin sulfonates, C 19-23 internal olefin sulfonates, C 20-24 internal olefin sulfonates and mixtures thereof which are blended with the C 24-28 internal olefin sulfonate, wherein the C 24-28 internal olefin sulfonate comprises at least 50% by weight of the internal olefin sulfonate blend, and wherein: a C 15-18 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 16 to 17 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 15 to 18 carbon atoms; a C 19-23 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 21 to 23 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 19 to 23 carbon atoms; a C 20-24 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 20.5 to 23 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 20 to 24 carbon atoms; and a C 24-28 internal olefin sulfonate is a blend of internal olefin sulfonates wherein the blend has an average carbon number of from 24.5 to 27 and at least 40% by weight of the internal olefin sulfonates in the blend contain from 24 to 28 carbon atoms; and (b) allowing the composition to interact with hydrocarbons in the crude oil containing formation. (a) providing a hydrocarbon recovery composition to at least a portion of the crude oil containing formation, wherein the composition comprises a C 24-28 internal olefin sulfonate and another internal olefin sulfonate selected from the group consisting of C 15-18 internal olefin sulfonates, C 19-23 internal olefin sulfonates, C 20-24 internal olefin sulfonates and mixtures thereof which are blended with the C 24-28 internal olefin sulfonate, wherein the C 24-28 internal olefin sulfonate comprises at least 50% by weight of the internal olefin sulfonate blend, and wherein: a C 15-18 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 16 to 17 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 15 to 18 carbon atoms; a C 19-23 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 21 to 23 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 19 to 23 carbon atoms; a C 20-24 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 20.5 to 23 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 20 to 24 carbon atoms; and a C 24-28 internal olefin sulfonate is a blend of internal olefin sulfonates wherein the blend has an average carbon number of from 24.5 to 27 and at least 40% by weight of the internal olefin sulfonates in the blend contain from 24 to 28 carbon atoms; and a C 15-18 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 16 to 17 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 15 to 18 carbon atoms; a C 19-23 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 21 to 23 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 19 to 23 carbon atoms; a C 20-24 internal olefin sulfonate is a mixture of internal olefin sulfonates wherein the mixture has an average carbon number of from 20.5 to 23 and at least 50% by weight of the internal olefin sulfonates in the mixture contain from 20 to 24 carbon atoms; and a C 24-28 internal olefin sulfonate is a blend of internal olefin sulfonates wherein the blend has an average carbon number of from 24.5 to 27 and at least 40% by weight of the internal olefin sulfonates in the blend contain from 24 to 28 carbon atoms; and (b) allowing the composition to interact with hydrocarbons in the crude oil containing formation.