File:Bulletin (1910) (14781616514).jpg

Identifier: bulletin195unit (find matches)
Title: Bulletin
Year: 1910 (1910s)
Authors: United States. Bureau of Mines
Subjects: Mines and mineral resources Mines and mineral resources Mining engineering
Publisher: Washington U.S. Govt. Print. Off. (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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r he could predict its location to within a fewfeet. Markers should beselected as near the oilhorizon as possible, forwith a shorter distance between the marker and the productive zonethere is less liability for the thickening and thinning of formationsfrom one well to another. Also, there may be a slight unconformitybetween the top beds and the oil zone, then the oil sand would notoccur at the same distance below the top marker. Figure 8 is a hypothetical sketch to show how an unconformitybetween the upper and lower beds might mislead the operator infinding the location of oil horizons in drilling wells. If well 2 wasdrilling after well 1 had been brought in, and the operator used thehard sand A as a marker, he would expect to encounter the oil sandC, in well 2, at 2.400 feet below the top of sand A. Actually, the oilsand would be much deeper. Had he used the top of marker B to-963 Landed 1000 si- iWSEA LEVEL ; CompleiInit. prod. Gravity J Well No. 9 Ele». 1347 Well No. 6 Elev. 1284
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TOP OF si-1255-H 1255 Init. prod. 80 bbl. per day Completed Aug.. 1908 Gravity 19*! Water 2 p ct 1308 Completed Sept.. 1908. Init. prod 150 bbl. per day -SB* JzfyEL Init. prod. 150 bbl. per day Gravity 21° Water 3 p.ct UOI Completed April. 1906nit. prod. 250 bbl. per day.Gravity W. Water 2 p.ct. Completed Sept.. 1906Init prod. 25 bbl per dayGravity 21°. Water I pet. Gravity 21° Water 2 p.ct Line of section 1. n/TCi; s A O CO. > ^ iv. t CARIBOU % T, t, S ,f Sec. 22, T. 19 S., R. 15 E. • Producing Oil Well -f Abandoned Oil Well SCALE 200O 4000 Feet CROSS SECTION OF WELLS OF SAUER DOUGH OIL CO.(For legend of symbols see fig. 4. p. 27.) GRAPHIC PRESEXTATION OF UNDERGROUND CONDITIONS. 41 in well 2 to predict the depth of the oil sand he would expect tofind oil at 1,270 feet below B; the actual depth would be 1,250 feet.No suggestions as to the true underground conditions would befound until after encountering limestone B. In well 2, the top ofsand A in both wells Avould f)arallel t

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