Spontaneous potential — Cont. 



effect of variation in 



hydrostatic pressure, 376 



factors influencing resistivity 

 of drilling fluids, 370 



fresh-water-bearing formations, 366 



salt-water-bearing formations, 366 

 Spores and pollen, 108 

 Stain analysis, 193 



benzidine test, 197 



calcite and aragonite, 195 



calcite and dolomite, 195 



clay-mineral stain tests, 197 



copper nitrate method, 195 



crystal-violet test, 198 



Fairbanks method, 195 



Lemberg method, 196 



malachite-green test, 198 



potassium ferricyanide method, 196 



safranine y test, 198 



silver chromate method, 195 

 Stratigraphic geology, 13 



subdivisions of, 13 

 Stratigraphic units, 14 



nature and classes of, 14 



rock units, 15 



time-rock units, 15 



time units, 15 

 Stratigraphy, 12 



definition, 12 

 Subsurface geologist, 1 



duties of, 5 



requirements of, 1 



training of, 7 

 Subsurface geologist, duties 



and reports of, 810 



duties on exploratory well, 810 



report writing, 823 

 Subsurface geologist, duties 



on exploratory well, 810 



caliper logging, 818 



core descriptions, 813 



core sampling, 814 



coring, 811, 818 



ditch sampling, 810 



ditch samples, 818 



drilling rate, 811 



electric logging, 818, 819 



formation testing, 815, 819 



gas samples, 817 



general, 820 



mechanical logging, 819 



mud and water tests, 819 



oil and gas samples, 820 



preparation of core samples for 

 analysis and shipment, 813 



radioactive logging, 818 



recording data, 821 



salinity test, 817 



tests for oil, 817 



well log, 810 



Subsurface geologist, examples 

 of report outlines, 847 

 on exploratory (wildcat) well, 847 

 on oil field, 850 

 on petroliferous province, 853 

 on well in proved field, 848 

 Subsurface geologist, report 

 writing, 823 



completion log report, 834 

 Creole well reports, 825 

 examples of outlines of reports 



on subsurface geology, 847 

 publication, 825 

 sand data report, 844 

 weekly chi-onological 



well report, 825 

 weekly well-sample report, 832 

 Subsurface geology, 1 

 definition, 1 

 future of, 9 



relationship to other sciences, 2 

 Subsurface laboratory methods, 84 

 Subsurface logging methods, 344 

 caliper logging, 439 

 composite-cuttings-analysis 



logging, 495 

 driller's logging, 475 

 drilling-mud and cuttings 



analysis, 449 

 drilling-time logging, 455, 478 

 electrical logs, 345 

 electric logging, 364 

 induction logging, 393 

 micrologging, 399 

 radioactivity logs, 345 

 radioactivity well logging, 419 

 sample logging, 344, 345 

 spectrochemical sample 



logging, 487 

 temperature logging, 444 

 Subsurface maps and illustrations, 894 

 block diagram, one-point 



perspective, 937 

 block diagrams, etc., 933 

 block diagrams showing relation- 

 ship of outcrop bands to 



dip and topography, 925 

 block diagrams showing 



unconformity, 899 

 coloring of geologic maps, 957 

 coloring of lithofacies maps, 947 

 contouring, suggestions on, 906 

 cross sections and projections, 926 

 drafting of maps, 963 

 facies maps, 936 

 isofacies maps, 942 

 isolith maps, 941 

 isopach maps, 912 

 lithofacies maps, 938 

 lithofacies maps, uses of, 951 

 log map, 930 



