380 



S. G. KOMAROV AND Z. I. KeIVSAR 



on % 

 10 20 30 10 



^Der, ^ darcies 

 5 100 5 1000 



Fig. 12. Core diagram of a part of a typical sand-clay cross-section (ChLli)(20i page 97)^ 



1 — clay; 2 — sandstones. 



It should be noted that if from the data of electrical logging, it would be 

 possible to detcfmine a certain mean permeability of the stratum, it cannot 

 necessarily be considered sufficiently characteristic of the stratum. Thus 

 neither fractures nor the very thin beds, including some which are very 

 permeable, are depicted on a log. On the other hand, the clayey beds show 

 a greater effect on the resistance curve than on the permeability data of the 

 stratum. Therefore, the obtained mean value of permeability gives an in- 

 sufficiently accurate idea on the permeability of the stratum, which is deter- 

 mined by a few very permeable members. 



As a result of what has gone before a method can be recommended for 

 determining the permeability from the specific resistance in accordance 

 with instructions which are given below, instead of conclusions. 



METHOD FOR DETERMINING PERMEABILITY OF PETROLEm/I-BEARING 

 STRATA FROM THE SPECIFIC RESISTANCE 



1. The method for determining the permeability of petroleum-bearing 

 strata from the specific resistance is based on the presence of a connection 

 between the interstitial water saturation and the permeability. It is also 

 assumed that the water saturation of the petroleum -bearing stratum, deter- 

 mined from the data of an electrical log, corresponds to the interstitial water 

 saturation . 



2. To use the method of determining permeability from the specific re- 

 sistance for any bed, it is necessary to construct for this stratum the curve- 



