The Alaska Geological Materials Center Inventory

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Frequently anticipated questions:

What does this data set describe?

Title: The Alaska Geological Materials Center Inventory
Abstract:
The Alaska Geologic Materials Center (GMC) in Eagle River holds non-proprietary rock core and cuttings that represent over 13 million feet of exploration and production drilling in Alaska. Additionally, the collection holds more than 252,000 linear feet of diamond-drilled hard-rock mineral core, representing more than 1,800 exploratory boreholes; 76,000 linear feet of oil and gas core and rock samples from more than 1,650 exploratory or production wells; samples for geotechnical boreholes; and numerous surface rock and sediment samples. The collection also includes extensive geochemical data and processed material derived from this rock. This publication represents the GMC inventory in accessible, intuitive digital formats for use by the general public.
Supplemental_Information:
The GMC inventory is available as a Keyhole Markup Language (KML) file, an international standard used by the Open Geospatial Consortium and can be viewed with Google Earth, NASA World Wind, or Microsoft Bing Maps 3D geobrowsers . Attribute information for the following files is included in this metadata file under the "Entity_and_Attribute_Information" section. GMC oil and gas and "hard-rock" mineral inventory summaries are also included as Portable Document Format (PDF) files. Files include: 
Alaska-GMC-Inventory (KML)
Alaska-GMC-Oil-Gas-Summary (PDF)
Alaska-GMC-Minerals-Summary (PDF)
  1. How should this data set be cited?

    Johnson, K.J., Riordan, J.A., Papp, K.R., Johnson, K.A., Skutca, J.E., Mansavage, H.L., and Hartman, D., 20100409, The Alaska Geological Materials Center Inventory: None None, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Eagle River, Alaska - USA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -130.0
    East_Bounding_Coordinate: 179.0
    North_Bounding_Coordinate: 72.0
    South_Bounding_Coordinate: 50.0

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 09-Apr-2010
    Ending_Date: Present
    Currentness_Reference: On-going development

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: document, vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set.

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001 degree. Longitudes are given to the nearest 0.000001 degree. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is WGS 1984.
      The ellipsoid used is WGS 1984.
      The semi-major axis of the ellipsoid used is 6356752.3142.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The GMC materials inventory KML file contains four main folders: Alaska Core Inventory, Geologic Materials Center Information, the Alaska Inventory Legend, and Geologic Overlays for Alaska. The list of detailed descriptions below will describe the contents of first three folders listed above. The latter folder contains KML layers related to the Map of Alaska's coal resources (Merritt and Hawley, 1986), the Alaska Resource Data File (U.S. Geological Survey, 2008), and the Historical Mining Regions and Districts of Alaska (Sturmann and Clement, 1993) and are documented elsewhere (see the "Online_Linkage" entries in the "Lineage" section). The GMC inventory is updated continuously and, as a result, the main GMC inventory KML file utilizes network links to call and load the individual well and prospect layers over the Internet. This methodology allows the user to always have the most current GMC inventory information. As a result, an Internet connection is required to view each layer and load the inventory data.
    Entity_and_Attribute_Detail_Citation: None
    Materials Inventory (Main Folder 1 of 4)
    Inventory summary of oil and gas and "hard-rock" minerals material at the GMC. This folder contains two network subfolders: Alaska Oil & Gas Well Summary and Alaska Mineral Borehole Summary (Source: Alaska Geological Materials Center)

    Alaska Oil & Gas Well Summary (Materials Inventory Sub-folder 1 of 5)
    Inventory summary of oil and gas materials at the GMC. Click the folder link to download a PDF version of the oil and gas inventory summary. Check/uncheck the option box to enable/disable the layer. Users may open the Alaska Oil & Gas Well Summary folder and press Ctrl-F (Windows) or Cmd-F (Mac) keys to search well names only. (Source: Alaska Geological Materials Center)

    Alaska Oil & Gas Well Summary Header (Placemark)
    Inventory summary of a given oil and gas well at the GMC. Click on the red and black dot at each well location to view the summary balloon. (Source: Alaska Geological Materials Center)

    Well Name
    AOGCC listed well name (Source: Alaska Oil and Gas Conservation Commission)

    Formal codeset
    Codeset Name:AOGCC_DataExtract.zip
    Codeset Source:AOGCC <http://doa.alaska.gov/ogc/publicdb.html>

    Mystery Dot
    Single <li> HTML tag to force underlined links in the KML placemark balloon (Source: Alaska Geological Materials Center)

    A bug in Google Earth can disable HTML links in the placemark balloon from being shown as underlined. Placing a single <li> tag in the markup seems to ensure that all links are underlined.

    API
    A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States. (Source: American Petroleum Institute)

    Example: 42-501-20130-03-00. The "42" means that this well is located in "State Code" 42 which is Texas. The "501" means that this well is located in "County Code" 501 which is Yoakum County. The "20130" is a "Unique Well Identifier" within the county. The "03" is the "Directional Sidetrack Code" for wells that have been sidetracked. The "00" is the "Event Sequence Code" to indicate how many operations have taken place (i.e. redrill).

    Operator
    AOGCC listed operator of the well (Source: Alaska Oil and Gas Conservation Commission)

    Formal codeset
    Codeset Name:AOGCC_DataExtract.zip
    Codeset Source:AOGCC <http://doa.alaska.gov/ogc/publicdb.html>

    Well Permit
    AOGCC permit number with links to AOGCC website (Source: Alaska Oil and Gas Conservation Commission)

    Unique well permit number.

    Total Depth
    Total depth of well (TD). (Source: Alaska Oil and Gas Conservation Commission)

    Range of values
    Minimum:0
    Maximum:23000
    Units:Feet

    Vertical Depth
    True Vertical Depth of well (TVD). Vertical distance from Kelly Bushing (KB), in feet. Requires a directional survey if hole is deviated. (Source: Alaska Oil and Gas Conservation Commission)

    Range of values
    Minimum:0
    Maximum:23000
    Units:Feet

    Completion Date
    AOGCC well drilling completion date (Source: Alaska Oil and Gas Conservation Commission)

    Date in MM/DD/YYYY format.

    Area
    AOGCC basin or area for well (Source: Alaska Oil and Gas Conservation Commission)

    Formal codeset
    Codeset Name:AOGCC_DataExtract.zip
    Codeset Source:AOGCC <http://doa.alaska.gov/ogc/publicdb.html>

    Digital Well Logs
    Well logs available in digital (LAS) format <http://www.cwls.org/las_info.php> from the AOGCC. Digital well logs are not currently available for all wells. (Source: Alaska Oil and Gas Conservation Commission)

    File in LAS, Log ASCII Standard, format. File name prefix is "DigLog," followed by the well area, then the well API number (see above).

    Oil & Gas Summary Explanation
    Link to a brief explanation of this entity type label (Source: Alaska Geological Materials Center)

    Online HTML version of the oil and gas summary explanation <http://dggs.alaska.gov/gmc_inventory/google_earth/html/oilandgas-summary-meta.html>

    Reality Check
    Link to a web page regarding advice and inventory data limitations (Source: Alaska Geological Materials Center)

    Online HTML version of the GMC Materials Use Advisory <http://dggs.alaska.gov/gmc_inventory/google_earth/html/gmc_advisory.html>

    Alaska Oil & Gas Well Summary Table
    Inventory summary of oil and gas well materials at the GMC (Source: Alaska Geological Materials Center)

    Materials Details
    Types of material available at the GMC (Source: Alaska Geological Materials Center)

    ValueDefinition
    CoreUnprocessed sample material
    CuttingsWashed/unwashed sample material
    ApatiteProcessed slides
    ClayProcessed slides
    ForaminiferaProcessed slides
    Heavy MineralsProcessed slides
    KerogenProcessed slides
    NannoplanktonProcessed slides
    PalynologyProcessed slides
    ResiduesProcessed residuals
    Siliceous FossilsProcessed slides
    Thin SectionsProcessed slides
    VitriniteProcessed mounts
    Formation Top PicksList of geologic formations through which the well was drilled.

    Top
    Topmost (shallowest) well interval having available sample material (Source: Alaska Geological Materials Center)

    Range of values
    Minimum:0
    Maximum:23000
    Units:Feet

    Bottom
    Bottommost (deepest) well interval having available sample material (Source: Alaska Geological Materials Center)

    Range of values
    Minimum:0
    Maximum:23000
    Units:Feet

    Count
    Count of unprocessed/processed well material over a given depth range having inventoried samples for a given well (Source: Alaska Geological Materials Center)

    Number could represent boxes, slides, bags of cuttings, etc.

    GMC Data Report Title(s) for Well
    Link to downloadable GMC publications containing analytical and interpretive data for a given well (Source: Alaska Geological Materials Center)