4 . "* ^'■' >--. 



SUBJECT INDEX 



Absorbancy of media, effect on seismic wave 



intensity, 93 

 Acoustic rigidity, effect on seismic wave 



reflection, 27-8, 38, 41 

 Anisotrophy coefficient, of sedimentary 



deposits, 244 

 Anticlinal folds, effect on electrical probing, 



289-91 

 Azimuthal-dipole probes, 198-206, 223^0 

 arrangement, 223 

 errors in, 231-6 

 practical procedure, 236^0 

 theory of, 224-31 



B 



Berezovka gas deposits, 210 

 Beryllium, detection by radiation, 415 

 Boreholes, 



camera for, 340-4 



optical studies of, 328-48 

 Boring rate, 



effect on gas saturation of drilling fluid, 



311 



variation in, 310 



Camera, for boreholes, 340^ 

 Caspian Sea area, geology of, 254-6 

 Cis-Baltic depression, geoelectric survey, 198 

 Cis-Carpathian depression, seismic wave 



reflection in, 75, 85 

 Clay suspensions, 



effect on oil detection, 320-2 



optical properties, 328-38 

 Cretaceous deposits, and multiple wave 



reflection, 75 

 Crimean steppes, geology of, 252 



D 



Damping of seismic waves, with distance, 29 



37, 38-9, 90-4 

 Density, effect on seismic wave intensity, 30 

 Devonian sandstones, 



oil-bearing, permeability, 349 



specific resistance, 335, 350, 354, 361, 



363 

 Diffracted seismic waves, 99-119 



dynamic properties, 108-110 



kinematic properties, 100-8 

 Diffraction, 



structural formation causing, 99 



from tapering strata, 110-9 

 Dipole probes, 



azimuthal, 197, 223-40 



effect of non-horizontal rock boundaries 



on, 292-7 



for inaccessible country, 214 



practical appUcation, 196-206 



theory of, 169-95 

 DP degasifier, for drilling fluid analysis, 311-2 

 DrilUng fluid, 



degasification, 311 



gas saturation, 

 estimation, 302 

 factors affecting, 302, 305, 310 



luminescence of, 289-92, 319-22 



luminescent spectral properties, 322-5 



optical properties, 308, 328-38 



E 



Echoes, single/double comparison, 40, 42 

 Elastic properties of media, 12 

 Electrical probing, 



distortion by non-horizontal rocks, 271- 

 -97 



in inaccessible country, 214, 223 

 Western Siberia, 196-222 

 strata relief studies, 201-6 



426 



