1070 



EXPLORATION GEOPHYSICS 



Field Equipment 



Electrical logging operations are performed using trucks provided with 

 the following equipment : various sondes, reel and cable, control panel 

 containing the necessary circuits, the pulsator, photographic recorder, blow- 

 out preventer, weight indicator, film-developing tanks and printers, resist- 



OPEN FOUMATION 



ELtCTDODE ASSEAtBir 

 00 RAOIOACTIVITl INSTRUMENT 



Fig. 666. — Schematic set-up for electrical logging of oil wells. (Courtesy of 

 Lane-Wells Company.) 



ivity cell for measuring the resistivity of the mud, etc. In addition they 

 must carry a source of power. All of the equipment may be carried in one 

 truck, as illustrated in Figures 664 and 665, or it may be divided between 

 a hoist truck and an instrument car. The two-car set-up is shown 

 schematically in Figure 666. 





