THE PERMEABILITY OF OIL-BEARING STRATA 



367 



the most probable value for the coefficients of increase in resistance (the 

 value with respect to which a half of the points has the greatest, and a half, 

 the least value of Q) is determined. Through the points corresponding to 

 these average values is drawn, with a certain amount of averaging, the curve 



Q=f{K,er)- 



' On the graphs, the dotted curves give the probable deviations* ("probable 

 error") of the coefficient of increase in resistance from its value corresponding 



Q 100 



8 100 



Kper, 01 darcies 



Fig. 5. Comparison of the ceofficient of increase in resistance Q with the values of 

 the permeabiUty Kp^j. Tuimazinsk deposit, stratum Dj. 



to a given permeability according to the curve Q ^/{K^^^. These curves 

 are drawn so that between each of them and the curve Q =f{Kp^j) there 

 is a quarter of all the points on the graph. 



Similar comparisons were carried out for the Djj stratum of the Tuima- 

 zinskian deposit and also for the D^, and D^^ strata of the Romashkin- 

 skian deposit and the stratum Dy of the Sokolovogorsk location. 



The actual curves for the dependence of the coefficient of the increase 

 in resistance of the permeabihty for the given regions are shown in Fig. 6. 



* The probable deviation is conditional by the fact that for a half of the cases the devia- 

 tion is greater, and for the other half smaller than the probable. 



