OCR Text |
Show Summitt Well Proves Theory Of Geology Infomation released to news media serving the petroleum industry by Shell Oil Com-ipany Com-ipany indicates that Shell's No. 1 Dahlgreen Creek Unit 'test, SE NE NW Section 1, T2N, R14E, Summit County, penetrated the North Flank Fault at shallow depth thus proving that the fault is a reverse type or thrust fault with a south-dipping plane (See Quarterly Review, Feb. '67, p. 1 and Aug. 67, p 7). The well is located 3.5 miles southwest of the Bridger Lake Oil Field under development devel-opment by Phillips Petroleum. Petrole-um. It is about one mile so. (mountainward) of the concealed con-cealed trace of the North Flank Fault and four miles '! north of the boundry of the proposed High Uintas Wilderness Wilder-ness area. Spudded on galcial deposits the well encountered question able Madison Limestone (Mis sissippian age) at 445 feet, then drilled limestone for a-bout a-bout another 370 feet. The North Flank Fault was crossed cross-ed at about 815 feet and the drilling' passed into formations forma-tions identified at Tertiary, possibly the Fort Union Formation For-mation of Paleocene age. Be tween 2434 and 2602 three thin porous sandstones with shows of live oil were encountered. en-countered. However, a drill stem test from 2400 to 2605 recovered only drilling mud. Preliminary information1 from this single well thus indicates in-dicates the North Flank Fault is a very shallow thrust which dips to the south beneath be-neath the Uinta Mountains at between 10 and 15 degrees. The hypothesis that oil-bearing formations of the Green River Basin might extend southward for many miles beneath be-neath the overthrust sheet has become a distinct geologic geo-logic possiblity. Shell was last reported drilling below 4800 feet toward to-ward the Dakota Formation oil sands expected at 15,800 ft. |