ROCKY MTN. AREA 



WELL NO. I 2 MILES WELL NO. 2 



INTERVAL VELOCITY INTERVAL VELOCITY 



a qoo loooo fps 150 00 eo oo 10000 fps 150 00 



Figure 21-14. Velocity logs, Rocky Mountain area. 



Velocity Logs Solve Geologic and Seismic Problems 



Further applications to geological and geophysical problems which may be 

 solved through the use of velocity logs are shown in Figures 21-14 and 21-15. 

 Velocity logs are shown in Figure 21-14 of two wells in the Rocky Mountain 

 area and are located approximately 2 miles apart. 



Well No. 1 has 200 feet of section present which is cut out by faulting in 

 Well No. 2. The over-all section indicates interval velocities of approximately 

 12,000 feet per second, except that in a zone comprising 20 feet of section in Well 



COMPARISON OF REFLECTION RESPONSE 

 TO VELOCITY CONTRASTS 



(ADJOINING COUNTIES) 



SEISMIC RECORO 



WELL NO. I WELL NO. 2 



Figure 21-15. Comparison of reflection response to velocity contrasts. 



420 



