836 Subsurface Geologic Methods 



ing are listed under "TUBING." Care is taken, and abbreviation 

 of unit names made, to assure that the names appear in the proper 

 column. In normal completions when there is no entry to be 

 made under "CASING," dashes are entered to indicate that nothing 

 has been omitted. 

 1. Self-potential and resistivity scales are drafted on the completion 

 log heading using Wrico lettering guide No. 90, Pen No. 7. When 

 ever the recorded curves run off the negative, they commence 

 again at the zero-scale line and are usually recorded at an altered 

 scale. When this is the case, altered scales should be included in 

 the log heading. The second galvanometer portion of the normal 

 curve, however, is shaded for clarification. If a scale unlike that 

 of the normal scale is used for the fourth curve, the altered scale 

 is included in the heading immediately below the normal re- 

 sistivity scale. 

 .02 Location Map 



a. Map is normally traced from a convenient scale company map. 



b. A 1:20,000 scale is preferred for exploitation wells. Wildcats or 

 outpost wells sometimes require smaller-scale maps. 



c. All wells are represented by a 2-mm. dot on a l:20,000-scale loca- 

 tion map, by a l|-mm. dot on 1 :50,000-scale location map, and 

 by a 1-mm. dot on all location maps 1:100,000 or smaller. The 

 scale of completion log heading-location maps is always indi- 

 cated in lower right-hand corner. The surveyed well to which the 

 log pertains is identified by a circle 5 mm. in diameter drawn 

 around the dot representing the well. 



d. The surveyed well is placed as close as possible to the center of 

 the map, yet not so close that such a position prevents the inclu- 

 sion, normally, of at least three nearby, previously drilled wells. 



e. All well numbers are drafted with Wrico Lettering Guide 90, 

 Pen No. 7. 



f. One north-south and one east-west, finely drawn, coordinate lines 

 are included on the map. Even thousand coordinate lines are 

 preferable. Coordinate numbers are drafted free-hand, as incon- 

 spicuously as possible, parallel to and to the left of the north- 

 south line as one reads from bottom to top, and parallel to and 

 above the east-west line as one reads from left to right. 



g. Concession lines are drafted somewhat heavier than coordinate 

 lines. 



h. The title of the concession in which a well occurs is shown on the 

 location plat by using Wrico Lettering Guide 90, Pen No. 7. 

 .03 Miscellaneous 



a. Whenever an entry is not made in the heading, a dash indicates 

 nothing has been omitted. 



b. The heading transparent is not attached to log negative but is left 



