ER-12-1 completion report

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Description

The objective of drillhole ER-12-1 was to determine the hydrogeology of paleozoic carbonate rocks and of the Eleana Formation, a regional aquitard, in an area potentially downgradient from underground nuclear testing conducted in nearby Rainier Mesa. This objective was addressed through the drilling of well ER-12-1 at N886,640.26 E640,538.85 Nevada Central Coordinates. Drilling of the 1094 m (3588 ft) well began on July 19, 1991 and was completed on October 17, 1991. Drilling problems included hole deviation and hole instability that prevented the timely completion of this borehole. Drilling methods used include rotary tri-cone and rotary hammer drilling with conventional ... continued below

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Medium: P; Size: 205 p.

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Russell, C.E.; Gillespie, D.; Cole, J.C. & Drellack, S.L. December 1, 1996.

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Description

The objective of drillhole ER-12-1 was to determine the hydrogeology of paleozoic carbonate rocks and of the Eleana Formation, a regional aquitard, in an area potentially downgradient from underground nuclear testing conducted in nearby Rainier Mesa. This objective was addressed through the drilling of well ER-12-1 at N886,640.26 E640,538.85 Nevada Central Coordinates. Drilling of the 1094 m (3588 ft) well began on July 19, 1991 and was completed on October 17, 1991. Drilling problems included hole deviation and hole instability that prevented the timely completion of this borehole. Drilling methods used include rotary tri-cone and rotary hammer drilling with conventional and reverse circulation using air/water, air/foam (Davis mix), and bentonite mud. Geologic cuttings and geophysical logs were obtained from the well. The rocks penetrated by the ER-12-1 drillhole are a complex assemblage of Silurian, Devonian, and Mississippian sedimentary rocks that are bounded by numerous faults that show substantial stratigraphic offset. The final 7.3 m (24 ft) of this hole penetrated an unusual intrusive rock of Cretaceous age. The geology of this borehole was substantially different from that expected, with the Tongue Wash Fault encountered at a much shallower depth, paleozoic rocks shuffled out of stratigraphic sequence, and the presence of an altered biotite-rich microporphyritic igneous rock at the bottom of the borehole. Conodont CAI analyses and rock pyrolysis analyses indicate that the carbonate rocks in ER-12-1, as well as the intervening sheets of Eleana siltstone, have been thermally overprinted following movement on the faults that separate them. The probable source of heat for this thermal disturbance is the microporphyritic intrusion encountered at the bottom of the hole, and its age establishes that the major fault activity must have occurred prior to 102.3+0.5 Ma (middle Cretaceous).

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Medium: P; Size: 205 p.

Notes

INIS; OSTI as DE97004833

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  • Other Information: PBD: Dec 1996

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  • Other: DE97004833
  • Report No.: DOE/NV/10845--36
  • Report No.: DRI--45120
  • Grant Number: AC08-90NV10845
  • DOI: 10.2172/465859 | External Link
  • Office of Scientific & Technical Information Report Number: 465859
  • Archival Resource Key: ark:/67531/metadc685251

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Creation Date

  • December 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Aug. 9, 2016, 12:47 p.m.

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Russell, C.E.; Gillespie, D.; Cole, J.C. & Drellack, S.L. ER-12-1 completion report, report, December 1, 1996; Las Vegas, Nevada. (https://digital.library.unt.edu/ark:/67531/metadc685251/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.