844 Subsurface Geologic Methods 



a fireproof location. The heading should be filed in a folder 

 in numerical order so they may be readily available. It is em- 

 phasized that the original logs are to be carefully preserved. 



Sand Data Report 



The sand data report is used by subsurface geologists to record in a 

 readily available manner certain formation and test data obtained during 

 the drilling of a well. See figure 428. 



Heading Entries — Heading entries to be made in sand data report are 



1. General 



a. A sand data sheet, which contains in a convenient form the name 

 of sand or formation, interval, subsea depths, net sand, net oil 

 sand, net producing sand, evaluation, and remarks, is prepared 

 upon the completion of each well by the district geological group. 



b. Data and symbols are entered on a blank sand data sheet by a 

 geologist. Any necessary drafting of symbols on a transparent 

 original is then accomplished and the well data is typed in. A 

 good typewriter ribbon is used. A piece of carbon paper is placed 

 behind the original in such a manner that the letters are typed on 

 both sides of the transparent original. Upon completion, a suf- 

 ficient number of copies are reproduced by the Ozalid method to 

 provide distribution in accordance with the current distribution 

 chart. 



c. The symbols used on the sand data sheets are distinctive and re- 

 quire no coloring. 



2. Preparation of Sand Data Sheet 



a. Age — In the column entitled "Age" are placed the correct age des- 

 ignations for the sands or formations within the over-all determina- 

 tion (i.e. Miocene, Eocene, Paleocene, Cretaceous). 



b. Sand or Formations — In the column entitled "Sand or Formation" 

 are listed, in stratigraphic order, the important sands or forma- 

 tions normally encountered in the area where the well is situated. 

 Wherever the stratigraphic section is somewhat questionable, blank 

 spaces are to be provided to permit the recording of the sands 

 or formations at a later date when the encountered sequence has 

 been definitely established. 



c. Interval — Insert the top and bottom electrical-log depths of each 

 sand and/or formation encountered. Whenever a sand or forma- 

 tion, normally encountered in the area, is found to be absent in the 

 well, the abbreviation "Abs" is entered in the "Interval" column. 

 When drilling ceases before a sand or formation is completely 

 penetrated, no bottom depth is indicated; and the letters "TD" are 

 substituted. 



d. Top Subsea — This calls for the subsea depth, preceded by a minus 

 sign, of the tops of the horizons encountered. 



