Duties and Reports of the Subsurface Geologist 847 



should be shown between the top and bottom depths. Under 

 "SWC," if side-wall cores are taken, "Yes" should be inserted. 

 If no side-wall cores are taken, "No" should be inserted. Rotary 

 table elevation, name of recorder, whom prepared by, maximum 

 deviation and depth of same, and area or field should all be in- 

 dicated. The well number should be drafted in with Wrico Tem- 

 plate No. 175. 

 3. Trimming — Trim lines 81 x 11- or 12-in. lengths are indicated on the 

 sand-data-sheet forms. Copies distributed to well files should be 

 trimmed to an 11-in. length, whereas those distributed for insertion 

 in books of sand-data sheets should be trimmed to a 12-in. length. 

 The 12-in. -length prints will be filed in a special folder which will 

 be prepared for the accumulation of sand-data sheets. 



Date Due — The sand-data report is due as soon as possible after com- 

 pletion, suspension, or abandonment of the well. 



Method of Preparation — Material is typewritten (elite type pre- 

 ferred) with carbon paper reversed to print on back also. Symbols are 

 drawn in ink by the draftsman. 



Copies — Copies of the sand-data report are in the following: 



Creole well files (5) Trimmed 8^ in. x 11 in.) 



Sand Data Sheet Book (5) Trimmed 8^ in. x 12 in.). 



Examples of Outlines of Reports on Subsurface Geology 



The organization of reports on subsurface geology varies according to 

 the subject. Thus, reports of regional scope differ from those devoted to 

 more local assignments. 



Examples of outlines of various types of subsurface reports follow: 



Report on Exploratory (Wildcat) Well 



I. Introduction 



Name of well and company, location of well, elevation (derrick floor and ground), 

 date commenced, date of completion or abandonment, date of final depth, casing 

 record (perforated intervals, size, cement data), total depth, type of drilling equip- 

 ment, summary of well history (hole deviation, coring program, logging surveys, 

 mechanical difficulties, etc.) 



II. Purpose of drilling well 



III. Summary 



1. Age, thickness (with corresponding depths) , relationships, and lithologic 

 summary of formations. 



2. Statement on the regional and local structure. 



3. Comments on oil and gas shows; age of host sediment. 



IV. Conclusions and recommendations 



V. Geology 



1. Stratigraphy (general statement) 



(a) Regional: variation in facies, thickness, unconformities, etc. 



(b) Local: (Based primarily on penetrated section) ; relationship to re- 

 gional stratigraphy; paleontologic and mineralogic summary (con- 

 tributed by stratigraphic laboratory) . 



