9\ 



s. s. c. 



CONTINUOUS 

 VELOCITY LOGS 



U S. : MAR. 1954 - NOV. 1956 

 CANADA : NOV. 1954 - MAY 1956 



& 



•* « 



Figure 21-20. Distribution of SSC velocity logs in United States and Canada. 



SUMMARY AND For the geophysicist, the continuous velocity 



CONCLUSIONS log is rapidly replacing the detailed conven- 



tional geophone survey, because the data ob- 

 tained enable the geophysicist to identfy seismic reflecting horizons and deter- 

 mine their actual depths. Also, the interval velocities obtained by the continuous 

 velocity logging method are more accurate than those obtained from conventional 

 geophone surveys. Furthermore, as the industry is gaining more familiarity and 

 confidence in continuous velocity logs, a material reduction in cost of velocity 

 surveys is being realized because the continuous logging survey requires less 

 time at the well site than is required by the detailed standard geophone survey. 



425 



