THE PERMEABILITY OF OIL-BEARING STRATA 



377 



Table 6. A comparison of the results obtained for different numbers of 



CORES FROM THE STRATUM 



more, even in rocks of one category, there is no single dependence between 

 the water saturation and perraeabihty. According to Kotyakhov, the 

 content of buried water in the strata depends not only on the physical 

 properties of the rocks, but also on other factors, the most important being 

 the "conditions of expulsion of water from the reservoirs by petroleum and 

 gases, and also the physical and physico-chemical properties of the petroleum, 

 water and gas". In this connection, Kotyakhov considers that "it is incorrect 

 to determine the permeability of the rocks from the data of water saturation 

 and specific electrical resistance" (^). 



In Baku in recent years a considerable amount of work has been done on the 

 study of interstitial water saturation. These results are given more fully by 

 Babalyan <^).This work indicates that the interstitial water saturation increases 

 with the decrease in permeabiHty. However, the degree of activity of the 

 petroleum and the type of stratum water has a considerable effect on the 



