368 



S. G. KOMAROV AND Z. I. KeIVSAR 



An opinion is widely held (^^' i*' ^^\ that the residual water saturation, 

 and consequently the coejEficient of increase in resistance depend on the 

 porosity of the stratum. In connection with this it is interesting to compare 

 the values for the coefficient of increase in resistance against the perme- 

 abiUty and also the porosity of the stratum. However, a comparatively small 

 number of points, related to a small number of wells, where the cores were 

 selected, and the wide scatter of the points does not allow this. It should 

 be noted that in view of the comparative homogeneity of the strata and the 



Kpj,, m darcies 



Fig. 6. Empirical curves for the dependence of the coefficient of increase in resist- 

 ance Q on the permeability Kp^^.. 1 — Tuimazinskian deposit, stratum i)j; 2 — Tuima- 

 ztaskian deposit, stratum i)jj;3 — Romashkinskian deposit, stratum Di^; 4— Roma- 

 shkinskian deposit, stratum Dj^. ; 5— Sokolovogorsk deposit, stratum D^; 6 — Dolina 



curve. 



small change in porosity, a large change in the coefficient of increase in 

 resistance on the porosity cannot be expected in practice. This is illustrated 

 in Fig. 7 where for the D^ stratum of the Tuimazinskian deposits, points are 

 given separately for the large and small values of porosity. In both cases, 

 the regularity of distribution of points differs little from that given in 

 Fig. 5 where points are given -without considering the porosity of the 

 stratum. 



The method for determining permeability by the specific resistance, 

 developed for the Devonian sandstones, of other regions (petroleum-bearing 

 strata of the Groznyi, Turkmen, Baku, Krasnodar and other deposits) led 



