Time and Cost 



Some oil companies follow an ultraconservative attitude in their strati- 

 graphic programs and make every attempt to reduce or even eliminate coring, 

 taking ditch samples, or running an electrical log. These "savings" frequently 

 result in failure to place a well on production or loss of profitable leases. On the 

 other hand, many companies spend great sums in obtaining basic stratigraphic 

 information. 



Quality of Personnel 



For one to become familiar with the various methods of correlation — 

 their uses and limitations — requires time, experience, and integrated reasoning 

 A company having young, inexperienced geologists must expect correlation 

 errors; therefore, every attempt should be made to give these men intense and 

 adequate training before allocating them responsibilities in correlation. 



METHODS OF SUBSURFACE All methods and techniques listed in Figure 

 CORRELATION 23-10 are applicable to correlating subsurface 



stratigraphic units; but to apply any one of 

 them beyond their limitations generally initiates poor results. Each method must 

 be considered only an integral part of the total correlation procedure. 



Figure 23-10. Procedures applied in correlation of strata. Some correlation problems require 

 a combination of procedures; others may involve only one to obtain favorable cor- 

 relation results. 



448 



