Geology of the Molina Member of the Wasatch Formation, Piceance Basin, Colorado

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Description

The Molina Member of the Wasatch Formation has been cored in order to assess the presence/absence and character of microbial communities in the deep subsurface. Geological study of the Molina Member was undertaken in support of the microbiological tasks of this project, for the purposes of characterizing the host strata and of assessing the potential for post-depositional introduction of microbes into the strata. The Molina Member comprises a sandy fluvial unit within a formation dominated by mudstones. Sandy to conglomeratic deposits of braided and meandering fluvial systems are present on the western and eastern margins of the basin respectively, although ... continued below

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36 p.

Creation Information

Lorenz, J.; Nadon, G. & LaFreniere, L. June 1, 1996.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 44 times , with 4 in the last month . More information about this report can be viewed below.

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Authors

  • Lorenz, J. Sandia National Labs., Albuquerque, NM (United States)
  • Nadon, G. Ohio Univ., Athens, OH (United States)
  • LaFreniere, L. FD Services Inc., Casper, WY (United States)

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The Molina Member of the Wasatch Formation has been cored in order to assess the presence/absence and character of microbial communities in the deep subsurface. Geological study of the Molina Member was undertaken in support of the microbiological tasks of this project, for the purposes of characterizing the host strata and of assessing the potential for post-depositional introduction of microbes into the strata. The Molina Member comprises a sandy fluvial unit within a formation dominated by mudstones. Sandy to conglomeratic deposits of braided and meandering fluvial systems are present on the western and eastern margins of the basin respectively, although the physical and temporal equivalence of these systems cannot be proven. Distal braided facies of planar-horizontal bedded sandstones are recognized on the western margin of the basin. Natural fractures are present in all Molina sandstones, commonly as apparent shear pairs. Core from the 1-M-18 well contains natural fractures similar to those found in outcrops, and has sedimentological affinities to the meandering systems of the eastern margin of the basin. The hydrologic framework of the Molina, and thus any potential post-depositional introduction of microbes into the formation, should have been controlled by approximately east-west flow through the natural fracture system, the geometries and extent of the sandstones in which the fractures occur, and hydraulic gradient. Migration to the well site, from outcropping recharge areas at the edge of the basin, could have started as early as 40 million years ago if the cored strata are connected to the eastern sedimentary system.

Physical Description

36 p.

Notes

OSTI as DE96014162

Source

  • Other Information: PBD: Jun 1996

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  • Other: DE96014162
  • Report No.: SAND--96-1135
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/285474 | External Link
  • Office of Scientific & Technical Information Report Number: 285474
  • Archival Resource Key: ark:/67531/metadc664763

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Creation Date

  • June 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • April 13, 2016, 1:59 p.m.

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Lorenz, J.; Nadon, G. & LaFreniere, L. Geology of the Molina Member of the Wasatch Formation, Piceance Basin, Colorado, report, June 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc664763/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.