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1995 National Oil and Gas Assessment Continuous-Type Plays within the Denver Basin Province

Metadata also available as - [Outline] - [Parseable text] - [DIF]

Frequently-anticipated questions:

What does this data set describe?

Title:
1995 National Oil and Gas Assessment Continuous-Type Plays within the Denver Basin Province
Abstract:
The fundamental geologic unit used in the 1995 National Oil and Gas Assessment was the play, which is defined as a set of known or postulated oil and or gas accumulations sharing similar geologic, geographic, and temporal properties, such as source rock, migration pathways, timing, trapping mechanism, and hydrocarbon type. The geographic limit of each play was defined and mapped by the geologist responsible for each province. The play boundaries were defined geologically as the limits of the geologic elements that define the play, such as the limits of the reservoir rock, geologic structures, source rock, and seal lithologies. The only exceptions to this are plays that border the Federal-State water boundary. In these cases, the Federal-State water boundary forms part of the play boundary. The play boundaries were defined in the period 1993-1994.
Supplemental_Information:
Continuous oil and gas plays within province 39 (Denver Basin) are listed here by play number and name: 
Number  Name
 3904   Greater Wattenberg Codell/Niobrara Oil and Gas
 3906   J Sandstone Deep Gas (Wattenberg)
 3920   Fractured Niobrara - Greater Silo/Dale Salt-Edge Oil
 3921   Fractured Niobrara - Greater Northern Denver Basin Oil
  1. How should this data set be cited?

    United States Geological Survey (USGS), 1996, 1995 National Oil and Gas Assessment Continuous-Type Plays within the Denver Basin Province: U.S. Geological Survey Digital Data Series DDS-30, USGS Central Energy Team, Denver, Colorado.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -106.1954371
    East_Bounding_Coordinate: -101.9844606
    North_Bounding_Coordinate: 43.85678569
    South_Bounding_Coordinate: 37.73470367

  3. What does it look like?

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

    Calendar_Date: 1996
    Currentness_Reference: 1996

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

  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. It contains the following vector data types (SDTS terminology):

      • Complete chain
      • Entity point
      • GT-polygon composed of chains
      • Point

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    pr"playnum"g.pat or pr"playnum"g.dbf
    Polygon Attribute Table. For each play, "playnum" is replaced with the actual play number in either a file, pr"playnum"g.pat, or a table, pr"playnum"g.dbf. (Source: U.S. Geological Survey)

    REG_NUM
    Region Number (Source: U.S. Geological Survey Energy Resource Regions)

    ValueDefinition
    4Rocky Mountains and Northern Great Plains

    REG_NAME
    Region Name (Source: U.S. Geological Survey Energy Resource Regions)

    ValueDefinition
    Rocky Mountains and Northern Great Plains 

    PROV_NUM
    Province Number (Source: U.S. Geological Survey Energy Resource Provinces)

    ValueDefinition
    39Denver Basin

    PROV_NAME
    Province Name (Source: U.S. Geological Survey Energy Resource Provinces)

    ValueDefinition
    Denver Basin 

    PLAY_NUM
    Play Number (Source: U.S. Geological Survey Energy Resource Plays)

    ValueDefinition
    3904Greater Wattenberg Codell/Niobrara Oil and Gas
    3906J Sandstone Deep Gas (Wattenberg)
    3920Fractured Niobrara - Greater Silo/Dale Salt-Edge Oil
    3921Fractured Niobrara - Greater Northern Denver Basin Oil

    PLAY_NAME
    Play Name (Source: U.S. Geological Survey Energy Resource Plays)

    ValueDefinition
    Greater Wattenberg Codell/Niobrara Oil and Gas 
    J Sandstone Deep Gas (Wattenberg) 
    Fractured Niobrara - Greater Silo/Dale Salt-Edge Oil 
    Fractured Niobrara - Greater Northern Denver Basin Oil 

    EUR_F100
    100% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_F95
    95% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_F75
    75% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_F50
    50% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_F25
    25% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_F5
    5% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_F0
    0% Fractile estimates for the distribution of estimated ultimate recovery for the entire play (in barrels of oil or millions of cubic feet of gas) (Source: USGS DDS-36)

    Stored as a floating-point value

    EUR_MEAN
    The mean estimate of volume of estimated ultimate recovery (in barrels of oil or millions of cubic feet of gas). (Source: USGS DDS-36)

    Stored as a floating-point value

    GAS_F95
    95% Fractile estimates for the distribution of volume of potential reserve additions of gas for the entire play (in billions of cubic feet) (Source: USGS DDS-36)

    Stored as a floating-point value

    GAS_F75
    75% Fractile estimates for the distribution of volume of potential reserve additions of gas for the entire play (in billions of cubic feet) (Source: USGS DDS-36)

    Stored as a floating-point value

    GAS_F50
    50% Fractile estimates for the distribution of volume of potential reserve additions of gas for the entire play (in billions of cubic feet) (Source: USGS DDS-36)

    Stored as a floating-point value

    GAS_F25
    25% Fractile estimates for the distribution of volume of potential reserve additions of gas for the entire play (in billions of cubic feet) (Source: USGS DDS-36)

    Stored as a floating-point value

    GAS_F5
    5% Fractile estimates for the distribution of volume of potential reserve additions of gas for the entire play (in billions of cubic feet) (Source: USGS DDS-36)

    Stored as a floating-point value

    GAS_MEAN
    The mean estimate of volume of potential reserve additions of gas (in billions of cubic feet). (Source: USGS DDS-36)

    Stored as a floating-point value

    LIQ_F95
    95% Fractile estimates for the distribution of volume of potential reserve additions of liquid for the entire play (oil for oil plays, NGL for gas plays; in millions of barrels) (Source: USGS DDS-36)

    Stored as a floating-point value

    LIQ_F75
    75% Fractile estimates for the distribution of volume of potential reserve additions of liquid for the entire play (oil for oil plays, NGL for gas plays; in millions of barrels) (Source: USGS DDS-36)

    Stored as a floating-point value

    LIQ_F50
    50% Fractile estimates for the distribution of volume of potential reserve additions of liquid for the entire play (oil for oil plays, NGL for gas plays; in millions of barrels) (Source: USGS DDS-36)

    Stored as a floating-point value

    LIQ_F25
    25% Fractile estimates for the distribution of volume of potential reserve additions of liquid for the entire play (oil for oil plays, NGL for gas plays; in millions of barrels) (Source: USGS DDS-36)

    Stored as a floating-point value

    LIQ_F5
    5% Fractile estimates for the distribution of volume of potential reserve additions of liquid for the entire play (oil for oil plays, NGL for gas plays; in millions of barrels) (Source: USGS DDS-36)

    Stored as a floating-point value

    LIQ_MEAN
    The mean estimate of volume of potential reserve additions of liquid (oil for oil plays, NGL for gas plays; in millions of barrels). (Source: USGS DDS-36)

    Stored as a floating-point value

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Christopher J. Schenk
    USGS
    Geologist
    U.S. Geological Survey MS939, Box25046
    Denver, Colorado 80225
    USA

    (303) 236-5796 (voice)
    schenk@usgs.gov

Why was the data set created?

The purpose of the play map is to illustrate the geologic boundary of the play as defined for the 1995 U.S. National Assessment. The play was used as the fundamental assessment unit.

How was the data set created?

  1. From what previous works were the data drawn?

    USGS DDS-30, Release 2 (source 1 of 3)
    U.S. Geological Survey, Gautier, D.L. (ed.), Dolton, G.L. (ed.), Takahashi, K.I. (ed.), and Varnes, K.L. (ed.), 1996, 1995 National Assessment of United States Oil and Gas Resources--Results, Methodology, and Supporting Data: U.S. Geological Survey Digital Data Series DDS-30.

    Type_of_Source_Media: CD-ROM

    USGS DDS-35 (source 2 of 3)
    U.S. Geological Survey, Beeman, W.R. (compiler), Obuch, R.C. (compiler), and Brewton, J.D. (compiler), 1996, Digital Map Data, Text, and Graphical Images in Support of the 1995 National Assessment of United States Oil and Gas Resources: U.S. Geological Survey Digital Data Series DDS-35.

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    digital map data in support of the 1995 U.S. National Oil and Gas Assessment

    USGS DDS-36 (source 3 of 3)
    U.S. Geological Survey, Charpentier, R.R. (compiler), Klett, T.R. (compiler), Obuch, R.C. (compiler), and Brewton, J.D. (compiler), 1996, Tabular Data, Text, and Graphical Images in Support of the 1995 National Assessment of United States Oil and Gas Resources: U.S. Geological Survey Digital Data Series DDS-36.

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    digital tabular data in support of the 1995 U.S. National Oil and Gas Assessment

  2. How were the data generated, processed, and modified?

    Date: Apr-2001 (process 1 of 1)
    We ran lins2cov.aml on the .lin files (from USGS DDS-35) to create the play coverages. The lins2cov.aml takes files from the NOGA 95 Spatial Data Disk (DDS-35), and reformats into Arc/Info Generate format (ASCII) files. They are then imported into ArcInfo coverages using the GENERATE command; subsequently they are cleaned to remove any potential overlap of polygons (using .000001 weed and fuzzy tolerances). Region/province/play numbers and names and the fractile estimates from the assessment of unconventional undiscovered accumulations are appended to the file using lookup information acquired from tables on the NOGA 95 Tabular Information Disk (DDS-36). Plays with insufficient data or that were given low probability of containing an accumulation of minimum size, were not quantitatively assessed during the 1995 National Oil and Gas Assessment. Plays that were not quantitatively assessed contain only the attributes defining region/province/play names and numbers. The coverage is then converted to a shape file.

    Data sources used in this process:

    • USGS DDS-30, Release 2
    • USGS DDS-35
    • USGS DDS-36

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    The main attribute for the play in this coverage is the play number, in which the first two digits represent the province number, and the next two digits represent the play number. Other attributes include the play name, and the region and province names and numbers. Also included are the output fractiles for the distribution of estimated ultimate recovery (in barrels of oil or millions of cubic feet of gas), the distribution of volume of potential reserve additions of gas (in billions of cubic feet) and, for continuous-type plays other than coalbed gas, the distribution of volume of potential reserve additions of liquid (oil for oil plays, NGL for gas plays; in millions of barrels).

  2. How accurate are the geographic locations?

    The play boundary was meant to delineate the gross boundary of the geologic elements that define the play.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Plays with insufficient data or that were given low probability of containing an accumulation of minimum size, were not quantitatively assessed during the 1995 National Oil and Gas Assessment. Plays that were not quantitatively assessed contain only the attributes defining region/province/play names and numbers.

  5. How consistent are the relationships among the observations, including topology?

    The play boundaries were defined on the basis of the surface and subsurface geology of the play, and the oil and gas production within the play. The province geologist was required to defend the geologic boundary of the play in a formal play review meeting.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: none
Use_Constraints: none

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey, Central Energy Team
    GIS Coordinator
    U.S. Geological Survey MS939, Box 25046
    Denver, Colorado 80225
    USA

    (303) 236-7773 (voice)
    lbiewick@usgs.gov

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although the data has been processed on the computer system at the U.S. Geological Survey, U.S. Department of the Interior, no warranty, expressed or implied, is made by the Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 17-Apr-2001
Last Reviewed: 30-Apr-2001
Metadata author:
U.S. Geological Survey, Central Energy Team
GIS Coordinator
U.S. Geological Survey MS939, Box 25046
Denver, Colorado 80225
USA

(303) 236-7773 (voice)
lbiewick@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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