DRILLING TIME 

 from 



GEOLOGRAPH CHARTS 



Min. Per Ft. _j 



Soft 1-5 ■ < 



Medium 6-7 [J z 



Hard 8-+ D k 



Micro Log 



IgOOD PERMEABILITY 



[Ifair permeability 



J LATFRAI 



Figure 225. Drilling breaks from "Geolograph" charts may be trans- 

 ferred to electric log for direct comparison. Refer to figure 

 224 for actual drill-time data from upper part of Scurry reef 

 limestone. 



