838 Subsurface Geologic Methods 



drafted on the left side of log in accordance with the draftsman's 

 guide on one line. Abbreviations are used when necessary, Wrico 

 Guide 90, Pen No. 7 are recommended. 



i. Fossil zones or subzones are indicated in accordance with the 

 draftsman's guide. The name of the zone and the depths are 

 written with an inclined Wrico Guide 90, Pen No. 7. 



j. A recognized or accepted fault encountered in a well is repre- 

 sented as shown on the log. Postulated faults are represented b) 

 similarly located, dashed lines. Throw (vertical displacement) of 

 fault or fault zone, when known, is included in accordance with 

 the draftsman's guide on the resistivity side of the log. 



k. Dipmeter readings and bearings are represented by the conven- 

 tional dipmeter symbol — an 8-mm., four-quadrant circle with the 

 direction of dip indicated therein — drafted on the resistivity side 

 of the log at the depth where measured. The type of instrument 

 used is represented by the letters "EM" (electro-magnetic) , "SP" 

 (self potential) or "RES" (resistivity) drafted above the circle. 

 Angle of dip is drafted below the symbol in accordance with the 

 draftsman's guide. Doubtful dipmeter results are indicated by a 

 question mark in parenthesis after the dip. 



1. Wire-line or conventional coring is represented by a symbol 2 mm. 

 wide adjacent to the zero line on the resistivity side of the log. A 

 line 3 mm. long marks the top and bottom of the cored interval. 

 The amount recovered is filled in solid black opposite the section 

 from where recovery is believed to have been obtained; whereas 

 the unrecovered section is left blank between the two vertical lines 

 which are 2 mm. apart. When Schlumberger negatives, with 

 depths recorded down the center of the log, are used, cored in- 

 tervals are limited to the 10-mm. strip in the middle of log. Place- 

 ment of such graphic data will vary with the type of log used. 

 In all other respects the representation is identical. The core 

 number is indicated to the right of the symbol for cored section, 

 m. Graphic representation of cored sections is in accordance with the 

 legend of lithologic symbols. Ditch sample and core data may 

 be represented on a percentage basis. 



n. Dips measured in cores are represented in degrees and drafted to 

 the immediate right of the core-recovery symbol of the log at the 

 depth where measured. 



o. Side-wall cores are represented in accordance with the lithologic- 

 symbol legend in a box approximately 3x6 mm., conveniently 

 located to the right of the zero line of the resistivity curve. 



p. Ditch samples are not normally represented graphically on com- 

 pletion logs unless they can materially aid in the log's interpre- 

 tation. When designated, they appear as approximate percentage 

 of each lithology represented. Clastics are plotted on left side and 



