822 SlUBSURFACE GEOLOGIC METHODS 



Location 



Enter the following data under this heading in the following order: 

 Designation — The designation of the prospect or area, such as "Gualanday 

 No. 1 anticline," "Totumal anticline," "Berreberre anticline"; the general con- 

 cession, such as "Dubasa"; and the state or province, such as "Choco." 



Location Details — Enter coordinates and coordinate reference point where 

 known; otherwise enter shot point or reference to other generally known survey 

 point. 



Elevation 



Enter elevation in feet referred to local standard elevation datum. Specify 

 "derrick floor" (DF) or "ground" (Gd). Enter both if available. 



Spudded 



Enter spud date. 



Depth 



Enter last available depth. Indicate total depth by "T.D." Add date on 

 which depth was reached. 



Operational Status (and Date) 



Enter current operational status as of date, such as "gravelling road," 

 "rigging up," "drilling," "coring," "suspended," and "abandoned." Add date 

 on which current status was reached if different from current date, as: "Com- 

 pleted (Aug. 17, 1946)." 



Casing 



First enter size and shoe depth for strings already set. Immediately under- 

 neath last string list, enter the word "programmed" and add casing program 

 for remainder of hole. 



Structure 



Indicate type of structure and closure and method of exploration used to 

 determine these factors, such as "fold closure, fault, seismic." 



Objective 



Indicate the principal stratigraphic objective zone. 



Production Tests and Shows 



Present the best summary of tests and shows to current date, which can 

 be shown within the space allotted on the form for this purpose. 



Stratigraphy 



Outline stratigraphy as indicated below, including all potential producing 

 formations within reach of the drill (about 15,000 feet for a standard deep- 

 drilling rig), regardless of scheduled drilling depth. 



Formation — Refer to the example given. List geologic epochs, formational 

 units, and important members (sand and/or others) of formations in outline 

 order under "Formation." As main headings in this outline, use terms qualify- 

 ing the degree of certainty of the interval and depth figures given, such as 

 "final," "tentative," and "estimated." Insert these main-heading terms wher- 

 ever they properly apply to the data. For instance, after drilling into the Eocene, 



