Graphic representations — Cont. 



contour maps of oil and gas 



reservoirs, 879 

 correlation between electric-log 



profile and formational units, 865 

 correlation charts, 857 

 correlation of well sections with 



control surface sections, 870 

 directional drilling on complex 



faulted structure, 875 

 electric profiles for plotting litho- 



logic logs, 861 

 final well log, 860 

 geologic cross sections, 884 

 isopach and lithofacies map, 880 

 lithologic graphic symbols, 859 

 oil and gas distribution and 



stratigraphic relationships, 869 

 paleogeologic map, 881 

 paleotectonic map, 882 

 plan structural view, 877 

 panel diagram, 873 

 relationship of well and surface 



sections, 867 

 scale, vertical exaggeration of, 883 

 standard well-log strips, 858 

 subsurface oil, gas, and water 



symbols, 862 

 symbols, misc., 863 

 well logs, 856 

 well symbols, 862 

 Grass seeds. 111 

 Gravitational prospecting, 1060 

 applications, 1074 

 basic principles, 1060 

 control, minimum and maxi- 

 mum, 1072 

 earth's gravitational field, 1064 

 instruments, 1067 

 interpretation, 1069 

 regional gradient, 1073 

 rock properties, 1063 

 torsion-balance data, 1073 

 Heavy minerals, 131 



errors in analysis of, 135 

 mineral identification, 133 

 preparation of sample, 131 

 use of data on, 134 

 Heavy-mineral separation, 174 

 Hydrafrac treatment, 723 

 application, 725 

 procedure, 724 

 Induction logging, 393 

 geometry of, 397 

 resistivity measurements, 394 

 Insoluble residues, 140 

 chart for, 144 

 data, plotting of, 154 

 description of, 143 

 descriptions, 154 

 preparation of, 140 



Insoluble Residues — Cont. 



terminology for, 146 



use of, 150 

 Lineations, 163 



map symbols, 163 

 Magnetic core orientation, 596 



applications, 608 



cores from deflected wells, 606 



experimental results, 606 



magnetic field of core barrel 

 and drill pipe, 605 



residual magnetic minerals, 

 distribution in core, 604 



rock movements, 604 



secondary residual magnetism, 603 



secular variation of earth's 

 magnetic poles, 601 



sediment, coarseness of, 600 



theory, 597 



variable geologic factors, 600 

 Magnetic prospecting, 1042 



applications, 1054 •" 



basic principles, 1043 



earth's magnetic field, 1045 



instruments, 1048 



interpretation, 1050 



rock properties, 1044 

 Micrologging, 399 



equipment, 402 



field examples, 417 



interpretation of, 404 



interpretation, quantitative, 418 



principle of, 399 

 Micropaleontologic analysis, 84 



calcareous algae, 95 



conodonts, 105 



diatoms, 101 



fish scales, 113 



Foraminifera, 86 



grass seeds. 111 



ostracods, 94 



otoliths, 108 



Radiolaria, 105 



spores and pollen, 108 

 Micropaleontologic laboratories, 114 

 Micropaleontologic studies, 114 

 Micro (petrographic) analysis, 172 

 Mining geology, subsurface and 



office representation in, 989 



area! map grid system, 999 



coordinate system, 998 



data and map sheets, 

 specifications of, 1002 



field-recording and office- 

 ledger survey sheet, 1003 



filing, 1010 



geologic representation, 

 essentials of, 993 



geologic representation, 

 objectives of, 990 



