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Lithofacies Mapping at the Hanford Site - Data Management, Analysis, and Visualization -

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Title: Lithofacies Mapping at the Hanford Site - Data Management, Analysis, and Visualization -


1
Lithofacies Mappingat the Hanford Site- Data
Management, Analysis, and Visualization -
  • George V. Last, Presenter
  • Christopher J. Murray
  • Mark L. Rockhold
  • Paul D. Thorne
  • Bruce N. Bjornstad
  • Robert D. Mackley
  • Michael J. Truex
  • Mart Oostrom
  • April 30, 2005

2
Key Points
  • Lithofacies mapping is a valuable tool for
    estimating the spatial distribution of physical
    and chemical transport properties in support of
    long-term performance assessments.
  • Progress is being made to advance access to and
    interpretation of subsurface geologic data to
    define the spatial distribution of lithofacies.
  • Progress is also being made to improve
    understanding of the petrophysical and
    geochemical properties within these lithofacies
    to support groundwater flow and transport
    simulations.

3
Contaminant Transport in ClasticSediments is
Highly Controlled by the Physical and Chemical
Properties of the Sediments
  • Particle Size/Pore Size
  • Sedimentary Fabric/Structures
  • Mineralogy
  • Secondary Mineralization (Cementation)
  • Compaction/Lithification
  • Secondary Structures (Bioturbation, Jointing,
    Fracturing)

Hanford formation (Gravel-dominated facies
association)
These are the same properties controlled by the
depositional environment and geologic history
4
Sequence Stratigraphic Architecture and
Lithofacies Relationships Beneath the Hanford Site
5
Elements of Lithofacies Mappingto Constrain
Spatial Distributionof Transport Parameters
  • Raw Field Data and Samples
  • Borehole Data
  • Trench Excavation Studies
  • Outcrop Studies
  • Field Testing
  • Infiltration Tests
  • Tracer Tests
  • Physical and Geochemical Testing
  • Borehole Data
  • Trench Excavation Studies
  • Outcrop Studies
  • Flow and Transport
  • Parameter Distributions
  • Laboratory Results
  • Upscaling
  • Facies Modeling
  • Borehole Interpretation (1-D)
  • Cross-Hole 2-D Interpretation
  • 3-D Integration and Interpretation
  • Paleogeography/Basin Modeling

Geostatistical Quantification of Spatial
Distribution
6
Hanford Borehole GeologicInformation System
(HBGIS )
  • A secure online web application supported by
    Microsoft SQL Server? as a back end database.
  • Uses a user friendly GUI (graphical user
    interface) to provide the Hanford Community with
    a comprehensive information management system for
    archival, retrieval, and interpretation of
    borehole geologic data.

7
The Integrated Borehole GeologicInformation
System Approach
8
Synergistic Analysis of Borehole Data
9
Spatial Modelingof the Geologic Framework
10
Assignment of Hydraulic Properties
Mean Lithofacies Specific Hydraulic Conductivity
Curves (After Last et. al. 2004)
11
Dissolved Aqueous Concentrations of Carbon
Tetrachloride (g/L) in the Ringold E Unit in 1993
12
Geostatistical Simulations ofLithofacies
Distributions
Simulation of the Median Values of the 100
Simulations
One of 100 Simulations
Courtesy of Debbie A. Bush
13
Summary
  • Uncertainty in flow and transport parameters are
    among the primary contributors to overall
    uncertainty in performance assessment results.
  • Flow and transport parameters are a function of
    the geologic framework, thus, lithofacies mapping
    provides a valuable mechanism for constraining
    the spatial distribution of these parameters.
  • Work is ongoing to identify and map a number of
    lithofacies beneath the Hanford site and to
    delineate the physical and geochemical parameter
    distributions for these lithofacies.
  • Data management and integration are key to the
    success and defensibility of estimating the
    spatial distribution of transport properties.

14
Acknowledgements
  • This work is being conducted as part of the
    Groundwater Remediation Project managed by Fluor
    Hanford, Inc. in support of the US Department of
    Energy
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