THE PERMEABILITY OF OIL-BEARING STRATA 



561 



As well as this curve, Dakhnov recommended for the Devonian sand- 

 stones the curve Q = /{K^^^ (Fig. 2, curve 2) which "was drawn by the 

 MoROZOV method"'^' P^^®*^*'. Since this curve differs httle from the 

 DoLiNA curve, the determination of permeability from it was not carried 

 out and the errors in the determinations of the permeabihty were not calcul- 

 ated. 



According to MoROZOv'-^^' p^^*^^^' the connection between the coeffi- 

 cient of increase in resistance ^ and the reservoir properties of the strata 

 (permeabihty K^^j., porosity m) for the Devonian sandstones is expressed 

 as shown by dotted lines in Fig. 3 (Morozov does not give the basis for the 

 curve in this figure). 



1000 



2 / 



8 100 



8 1000 



m darcies 



Fig. 2. Various curves for the dependence of the coefficient of increase of resistance Q 



on the permeability J^^yer ■'■ — according to Dolina(*); 2 — according to 



Dakhnov(3, page 424). 3_according to Wyllie and Rose for c = 10("). 



Using these curves, the permeability of a number of strata was determined 

 by employing the same values of the coefficient for the increase in resistance, 

 that serve for the calculation of permeabihty by the Dohna curve (the 

 accurate curve). 



