Subject index 



429 



Sandstone, detection by radiation, 415 

 Sea probes, electrical apparatus for, 169-83 

 Seismic rays, spatial direction, 44-73 

 Seismic waves, 



damping with distance, 29, 37-9 

 diffracted, dynamic properties, 108-110 

 kinematic properties, practical, 105-8 

 properties, theoretical, 100-5 

 doubly reflected, 39-10, 91 

 intensity calculation, 15-27 

 longitudinal, intensity, 11-43 

 multiple reflected, damping with distance, 

 90-4 



reflected, dynamic properties, 80-95 

 intensity, 18, 20, 85-90 

 interference by, 75 

 kinematic properties, 76-80 

 primary, in multi-layered media, 28-37 

 factors affecting, 30-7 

 intensity of, 15-8, 28-37 

 reflected, hodograph construction for, 

 55-73 



intensity of, 18-27, 37-43 

 in multi-layered media, 40, 55-73 

 refracted, intensity of, 28-37 

 simple reflected, 18 

 Seismical studies, 



comparison with loop method, 250-4 



with telluric currents, 212 

 of Kerch peninsular, 250 

 Siberia, west, 



electro -geological survey, 196-222, 256 

 gravimetric survey, 161-3 

 telluric current fields in, 209 

 Specific gravity of clay suspensions, 

 effect on light transmittance, 331 

 Specific resistance, 



of Devonian sandstones, 350, 354, 361, 

 363 



drilhng fluid, errors in measurement, 

 384-90 



marine electrical probe instruments, 

 178-83 



Mezo-Cenezoic deposits, 204 

 oil-bearing strata, 349-53 

 measurement (see Resistivity meters) 



-permeabihty of rock strata, 360-4, 



368-82 



-porosity of rock strata, 368-73 

 Spectral characteristics, 



of oil products, 323 

 Stereographic nets, construction of, 46-7 

 Stereographic projections, 44-73 



Taman peninsula, 



geology of, 254 

 Telluric currents, 



electronic measuring apparatus, 219-21 



in geological surveys, 206-13 



in Western Siberia, 209 

 Transverse waves, effect on longitudinal wave 



intensity, 30, 39^0 

 Turkmenia, geology, 256 

 Two-layered media, wave intensity in, 28-9, 

 37 



U 



Ust-Urt plateau, 



geology of, 258, 267 



Volcano -sedimentary strata, 



effect on electrical surveys, 199, 204, 210 



W 



Water saturation, 



-permeability of rock strata, 373-4, 

 377-^, 380-2 



-specific resistance of oil strata 351, 353, 

 358-60 



theoretical value, 364 

 Well camera, 



design of, 340-4. 

 Wulir net, 45, 55, 57 



accuracy of, 73 



uses of, 47-53, 65, 68-9 



