Duties and Reports of the Subsurface Geologist 845 



Net Sand — This is the actual net-sand thickness, in feet, found 

 within the sand or formation as determined from electrical-log in- 

 terpretation or cores. The net sand figure entered for any sand or 

 formation not completely penetrated should be followed by a plus 

 sign. 



Net Oilsand- — ^This is the number of feet of net saturated-oil sand 

 assigned to the sand or formation from electrical-log interpretation, 

 core valuation, or actual tests. The net oilsand figure entered for 

 any sand or formation not completely penetrated should be fol- 

 lowed by a plus sign. 



Net Producing Sand — This is the number of feet of oil sand which 

 can be effectively drained with the present perforations open. For 

 example, a sand body may contain 23 ft. of net producing oil sand 

 but may have only a 10-ft. section perforated (i.e. in homogeneous 

 sand bodies, vertical permeability may be assumed up to and down 

 to the nearest shale break) . 



Evaluation — This column shows graphically, where possible, the 

 interpretation of the sand as determined by tests, ditch samples, or 

 cores. Production-test results are indicated by modifying, where 

 necessary, the 2-mm. circle appearing on the transparent original 

 in accordance with well symbols for use on reservoir isopach maps. 

 Results of drill-stem tests are similarly represented with the ad- 

 dition of the letters "DST" to the right of the circle. Evaluation 

 of ditch samples or cored intervals are presented in accordance 

 with the symbols. The unit left open to production is designated 

 in accordance with the appropriate symbol. See figure 429. 

 Remarks- — This column will list pertinent information which will 

 further explain or clarify data on the sand or formation under dis- 

 cussion. The "Remarks" column will show "Net Perfd. Oil Sand 

 Open," which is defined as only that number of feet of oil sand 

 opposite the perforated interval (i.e. if 1610-1622 ft. were per- 

 forated in a sand body containing 46 ft. of net oilsand, only 12 ft. 

 would be shown for this "Net Perfd. Sd." figure in the "Remarks" 

 column) . This fact would be indicated by "Perfd. Sd." followed 

 by the number of feet. Also in the "Remarks" column will be 

 shown initial production in BOPD and API gravity of the oil. If 

 producing rates are determined from drill stem or production tests, 

 they are also indicated in the "Remarks" column. 

 Electrical Survey — Under "Electrical Survey" the uppermost and 

 lowermost depths logged should be indicated. The type of equip- 

 ment used for making such a survey should be shown in paren- 

 thesis: i.e. (Schl.) for Schlumberger or (E.G.) for Blau Gemmer. 

 If some other logging unit is used, it should be indicated accord- 

 ingly. 

 Other Surveys — Indicate whether dip-meter, temperature, caliper, 



