ELECTRICAL METHODS 



569 



Structural Investigations 



Structural Survey in East Vacuum Area, ISew Mexico 



This survey was conducted during 1938 and is of particular interest 

 because drilling subsequent to the survey has provided a good opportunity 

 to evaluate the work.* Although complete structural information has not 

 yet become available, the present information shows a remarkably close 

 agreement between the structure predicted from the geoelectrical survey 

 and the structure as indicated by well log correlation. The accuracy of 

 the geoelectrical work is evidenced by: (1) close agreement between 



LtCENO ' 



•*' GeOCLCCTRICAL STATIC** 

 • •<^ OaiLLCD WILLS 



PnoeABLE STRUCTURE CONTOUR BASED 

 UPON CEOELECTRtCAL SuRVCT 



♦■.■f^V- WELLS MILLED SUBSEQUENT TO GEOELECTRICAL 



"* DATUU ON TOP or YATES SAND t 



OATUM EXTRAPOLATED TO NORIION EWPlOTED IN GEOELECTRICAL SuDVET. 



Fig. 351. — Structure contour map based on geophysical studies. (East Vacuum Area, Lea County, 



New Mexico.) 



the proved boundaries of the oil pool and the probable boundary as pre- 

 dicted by structure contours plotted from the geoelectrical data, and (2) 

 close agreement between the geoelectrical and the well log subsurface 

 datums at the ten well locations for which information is available. 



* The interpretation of the geophysical data utilized the method of curve corre- 

 lation described on p. 509. 



