A method for increasing the recovery of crude oil from a reservoir comprising at least one oil-bearing porous subterranean formation having a permeability of greater than 10 millidarcies wherein (a) crude oil and connate water are present within the pore space of the formation rock, and (b) the crude oil that is present in the formation has an American Petroleum Institute gravity of less than 25°, a viscosity under reservoir conditions of greater than 1 centipoise, and undissolved solids suspended therein, the method comprising: injecting an injection water into the formation wherein the injection water has undissolved solids suspended therein, wherein the undissolved solids suspended in the injection water have an average particle size of 10 microns or less, wherein the undissolved solids naturally occur within the water prior to the injecting, wherein the injection water has a total dissolved solids content of from 20,000 to 30,000 ppm, and a ratio of the total multivalent cation content of the injection water to the total multivalent cation content of the connate water of less than 0.9; and producing within the hydrocarbon-bearing formation an emulsion, wherein the emulsion within the hydrocarbon-bearing formation is produced by the injecting of the injection water, the emulsion being formed spontaneously and comprising a discontinuous aqueous phase and a continuous oil phase, wherein the total amount of undissolved solids suspended in the injection water and of undissolved solids suspended in the crude oil is sufficient for the emulsion to have an undissolved suspended solids content of at least 0.05 % by weight (0.5 kg/m 3) of emulsion, wherein the content of the undissolved solids suspended in the crude oil contained in the pores of the formation may be determined by measuring the content of undissolved suspended solids for produced oil obtained from the formation and separated at a production facility. injecting an injection water into the formation wherein the injection water has undissolved solids suspended therein, wherein the undissolved solids suspended in the injection water have an average particle size of 10 microns or less, wherein the undissolved solids naturally occur within the water prior to the injecting, wherein the injection water has a total dissolved solids content of from 20,000 to 30,000 ppm, and a ratio of the total multivalent cation content of the injection water to the total multivalent cation content of the connate water of less than 0.9; and producing within the hydrocarbon-bearing formation an emulsion, wherein the emulsion within the hydrocarbon-bearing formation is produced by the injecting of the injection water, the emulsion being formed spontaneously and comprising a discontinuous aqueous phase and a continuous oil phase, wherein the total amount of undissolved solids suspended in the injection water and of undissolved solids suspended in the crude oil is sufficient for the emulsion to have an undissolved suspended solids content of at least 0.05 % by weight (0.5 kg/m 3) of emulsion, wherein the content of the undissolved solids suspended in the crude oil contained in the pores of the formation may be determined by measuring the content of undissolved suspended solids for produced oil obtained from the formation and separated at a production facility.