378 



S. G. KOMAROV AND Z. I. KeIVSAR 



value of the interstitial water saturation. Analogous opinions are also held 

 by Avanesov(^): "The interstitial water saturation can be different both 

 in the type of water and the quantity of the pore content, which is conditioned 

 by the capillary and adsorption phenomena, and also by the physical properties 

 of the liquids, the rocks and the structural featurss of the reservoirs". 



It follows from these remarks that the structural features of the reservoirs, 

 including the permeability, usually play a less important role than the 

 properties of the petroleum, the stratum water and the adsorption pheno- 

 mena. This is illustrated by results on the residual water saturation (Fig. 11), 

 recommended by Babalyan for practical use. 



Fig. 11. Curves for the dependence of coefficient of residual water saturation iC^_ j^ 

 on the permeability -Kpe^ for sandstone (from the data of (2)). The rock was saturated 

 with fresh (tap water) T, distilled D, laboratory alkaline A and stratum alkaline 

 (water of the PK suite) S water; the extraction was carried out with inactive, i, low 

 active 1, active a and highly active h petroleum (petroleum with different content of 



polar impurities). 



Jones <^) and Masket (^^), indicating the decrease in water saturation of 

 petroleum-bearing strata with increase in their permeability, observed that 

 this connection does not have a general character. According to Masket 

 *'the value of the water saturation in the oil-bearing rocks changes within 

 wide hmits for different reservoirs, even if their physical characteristics 

 (for example, porosity and permeability) are close to one another". However, 

 for individual rock types Masket admits the possibility of a closer connec- 

 tion between the interstitial water saturation and the permeability and also 



