Qualitative assessment of composition and reservoir quality of Albian-Cenomanian Nanushuk Formation sandstones, measured outcrop sections, central North Slope, Alaska

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Frequently anticipated questions:


What does this data set describe?

Title:
Qualitative assessment of composition and reservoir quality of Albian-Cenomanian Nanushuk Formation sandstones, measured outcrop sections, central North Slope, Alaska
Abstract:
Raw Data File 2021-13, Qualitative assessment of composition and reservoir quality of Albian-Cenomanian Nanushuk Formation sandstones, measured outcrop sections, central North Slope, Alaska, presents a qualitative appraisal of thin sections collected from Nanushuk outcrops to ascertain their reservoir potential. The DGGS sample collection was searched for petrographic thin sections collected from stratigraphic sections of the Nanushuk Formation measured by David LePain working with various colleagues, including Russ Kirkham, Paul Decker, Dave Houseknecht, and Nina Harun over the past 22 years. The search yielded 264 thin sections of Nanushuk siltstone and sandstone. Three additional thin sections of the Seabee Formation mudstone, siltstone, and sandstone were collected from the upper portion of a measured section that straddles the Nanushuk - Seabee contact. These 267 samples were collected from 32 stations located in eight geographic areas on the North Slope, including Slope Mountain, May Creek, Arc Mountain, Rooftop Ridge, Big Bend of the Chandler River, Ninuluk Bluff on the Colville River, Killik Bend of the Colville River, and Horseshoe Bend of the Colville River. The thin sections were examined qualitatively to ascertain several petrographic properties, including grain size, detrital composition, cement and matrix content, the abundance of burrows and laminations, and porosity distribution. Sedimentary structures observed in the field were noted, as was the interpreted sedimentary facies association. The results are compiled in a spreadsheet along with information on geographic location, latitude, longitude, and measured petrophysical properties (porosity, permeability, and grain density) of the few samples where available. All files are available from the DGGS website: http://doi.org/10.14509/30746.
Supplemental_Information:
petrographic-data:    Petrographic properties of mudstones, siltstones, and sandstones in spreadsheet format.	
photomicrographs:    Collection of photomicrographs or mudstones, siltstones, and sandstones in pdf format
  1. How might this data set be cited?
    Helmold, K.P., LePain, D.L., and Harun, N.T., 2021, Qualitative assessment of composition and reservoir quality of Albian-Cenomanian Nanushuk Formation sandstones, measured outcrop sections, central North Slope, Alaska: Raw Data File RDF 2021-13, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 8 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -155.762933
    East_Bounding_Coordinate: -149.025190
    North_Bounding_Coordinate: 69.141325
    South_Bounding_Coordinate: 68.643059
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 1999
    Ending_Date: 2021
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: table
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a point 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 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is WGS84.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257223563000025.
  7. How does the data set describe geographic features?
    rdf2021-13-petrographic-data.csv
    Petrographic properties of mudstones, siltstones, and sandstones in spreadsheet format. (Source: Alaska Division of Oil & Gas)
    sort_order
    short integer (Source: this report) Ordinal number given to each sample in this dataset
    dggs_sample_number
    text (Source: this report) DGGS sample number
    latitude_wgs84
    long integer (Source: this report) sample latitude using WGS84 datum
    longitude_wgs84
    long integer (Source: this report) sample longitude using WGS84 datum
    cnt
    text (Source: this report) point counted; presence is indicated by "X", absence is indicated by null values
    rpk
    text (Source: this report) porosity and permeability measurement taken; presence is indicated by "X", absence is indicated by null values
    pho
    text (Source: this report) photo taken; presence is indicated by "X", absence is indicated by null values
    image_number
    short integer (Source: this report) image number of sample
    perm_a
    short integer (Source: this report) ambient permeabilty in millidarcies
    perm_k
    short integer (Source: this report) klinkenberg permeability in millidarcies
    por_a
    short integer (Source: this report) ambient porosity in percent
    por_cns
    short integer (Source: this report) porosity NCS (net confining stress) in percent
    density_g_per_cc
    short integer (Source: this report) density measurement in grams per cubic centimeter
    formation
    text (Source: this report) sample formation
    location_gen
    text (Source: this report) general location of sample
    location_spec
    text (Source: this report) specific location of sample
    location_details
    text (Source: this report) other sample location details
    grain_size
    short integer (Source: this report) sample grain size
    porosity
    text (Source: this report) qualitative sample porosity estimates from thin section
    mineralogy
    text (Source: this report) sample mineralogy
    cement_matrix
    text (Source: this report) sample cement and/or matrix
    petrographic_features
    text (Source: this report) sample petrographic features
    facies_association
    text (Source: this report) sample facies association (see description in text table)
    sedimentary_structures
    text (Source: this report) sample sedimentary structures
    comments
    text (Source: this report) sample comments
    rdf2021-13-photomicrographs
    Collection of photomicrographs or mudstones, siltstones, and sandstones in pdf format (Source: Alaska Division of Oil & Gas)

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?
    Funding was provided over the past 22 years by an industry consortium comprised of various companies, including Anadarko Petroleum, BP Exploration, Chevron USA Production Company, ConocoPhillips, Encana, Eni, Oil Search, PetroCanada, Pioneer Resources, Shell Western Exploration and Production, TotalFinaElf, and Unocal; some of these companies no longer exist. Additional funding was provided by the U.S. Geological Survey and the State of Alaska.
  3. To whom should users address questions about the data?
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

Why was the data set created?

The DGGS Energy Resources Section generates new, unbiased information on the geologic framework of frontier areas in Alaska that may host undiscovered oil, gas, coal, and geothermal resources. Northern Alaska is a world-class petroleum province that includes some of North America's most prospective onshore regions. Despite this potential, the North Slope remains underexplored relative to other sedimentary basins around the world. New exploration ventures are hampered by the limited amount of published geologic data, and much of the available information is reconnaissance in nature. This work has been spurred by the hydrocarbon discoveries announced between 2015 and 2018 that are associated with stratigraphic traps in the Nanushuk Formation. These discoveries form two roughly parallel fairways; a western trend that includes the Willow and West Willow oil accumulations, located in the northeastern National Petroleum Reserve in Alaska, and an eastern trend comprised of the Pikka, Narwhal, and Horseshoe oil accumulations, located on state land in the Colville Delta area.

How was the data set created?

  1. From what previous works were the data drawn?
    Harris, E.E. and others, 2002 (source 1 of 1)
    Harris, E.E., Mull, C.G., Reifenstuhl, R.R., and Montayne, Simone, 2002, Geologic map of the Dalton Highway (Atigun Gorge to Slope Mountain) area, southern Arctic Foothills, Alaska: Preliminary Interpretive Report PIR 2002-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: digital data
    Source_Scale_Denominator: 63360
    Source_Contribution: Convert SRTM DEM files to ArcGRID format
  2. How were the data generated, processed, and modified?
    Date: 2019 (process 1 of 3)
    Sample selection - The DGGS sample collection was searched for petrographic thin sections collected from stratigraphic sections of the Nanushuk Formation measured by David LePain working with various colleagues, including Russ Kirkham, Paul Decker, Dave Houseknecht, and Nina Harun over the past 22 years. These 267 samples were collected from 32 stations located in eight geographic areas on the North Slope, including Slope Mountain, May Creek, Arc Mountain, Rooftop Ridge, Big Bend of the Chandler River, Ninuluk Bluff on the Colville River, Killik Bend of the Colville River, and Horseshoe Bend of the Colville River.
    Date: 2020 (process 2 of 3)
    Petrographic analysis - The thin sections of the DGGS samples were examined qualitatively to ascertain several petrographic properties, including grain size, detrital composition, cement and matrix content, abundance of burrows and laminations, and distribution of porosity. Sedimentary structures observed in the field were noted, as was the interpreted sedimentary facies association. The results are compiled in a spreadsheet along with information on geographic location, latitude, longitude, and measured petrophysical properties (porosity, permeability, and grain density) of the few samples where available. Photomicrographs included in this data release document key petrographic features of select samples.
    Date: 2021 (process 3 of 3)
    Field observation location verification - This work incorporates a careful review of sample sites relative to ESRI basemap imagery and field notebooks. Observers corrected sample numbering and location transcription errors that were included in prior releases. Location coordinates of older stations were converted to the WGS84 coordinate system.
  3. What similar or related data should the user be aware of?
    Harris, E.E., Delaney, P.R., Mull, C.G., LePain, D.L., and Burns, P.A.C., 2009, Geologic map of the Kanayut River area, Chandler Lake Quadrangle, Alaska: Preliminary Interpretive Report PIR 2009-7, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    LePain, D.L., Decker, P.L., Helmold, K.P., and Wartes, M.A., 2017, Depositional setting and potential reservoir facies in the Nanushuk formation (Albian-Cenomanian), Brookian topset play, North Slope, Alaska: Poster and Presentation LePain, D.L. and others, 2017, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet
    LePain, D.L., Decker, P.L., and Helmold, K.P., 2018, Brookian core workshop: Depositional setting, potential reservoir facies, and reservoir quality in the Nanushuk Formation (Albian-Cenomanian), North Slope, Alaska: Miscellaneous Publication MP 166, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 58 p
    LePain, D.L., Decker, P.L., and Wartes, M.A., 2008, Measured sections and preliminary interpretations of the Nanushuk Formation exposed along the Colville River near the confluences with the Awuna and Killik rivers: Preliminary Interpretive Report PIR 2008-1D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: p. 41-45, 4 sheets
    LePain, D.L., Kirkham, R.A., and Montayne, Simone, 2021, Measured stratigraphic section, Nanushuk Formation (Albian-Cenomanian), Nanushuk River (Rooftop Ridge), Alaska: Preliminary Interpretive Report PIR 2021-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 8 p., 1 sheet
    LePain, D.L., McCarthy, P.J., and Kirkham, R.A., 2009, Sedimentology and sequence stratigraphy of the middle Albian-Cenomanian Nanushuk Formation in outcrop, central North Slope, Alaska: Report of Investigation RI 2009-1 v. 2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 76 p., 1 sheet
    Reifenstuhl, R.R., Mull, C.G., Harris, E.E., LePain, D.L., Pinney, D.S., and Wallace, W.K., 2000, Geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 15 p., 1 sheet, scale 1:63,360
    Reifenstuhl, R.R., Mull, C.G., Harris, E.E., LePain, D.L., and Wallace, W.K., 2000, Interpretive bedrock geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 11 p., 1 sheet, scale 1:63,360
    Wartes, M.A., Decker, P.L., Gillis, R.J., Herriott, T.M., and LePain, D.L., 2014, Predicting deep-water reservoirs in the Brookian Sequence: Underexplored plays on the North Slope, Alaska (presentation): Alaska Geological Society Technical Conference, Anchorage, Alaska, May 15, 2014: Poster and Presentation Wartes, M.A. and others, 2014, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 46 p
    Wartes, M.A., Wallace, W.K., Loveland, A.M., Gillis, R.J., Decker, P.L., Reifenstuhl, R.R., Delaney, P.R., LePain, D.L., and Carson, E.C., 2011, Geologic map of the Kavik River area, northeastern Brooks Range, Alaska: Report of Investigation RI 2011-3A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 14 p., 1 sheet, scale 1:63,360

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

  1. How well have the observations been checked?
    This work provides a qualitative analysis of textural and petrophysical features visible in petrographic sections. The accompanying report provides a comprehensive description and discussion of the petrographic classifications and observed properties.
  2. How accurate are the geographic locations?
    This publication provides locations converted to the WGS84 coordinate system. Sample collection spans several decades, and the originating GPS coordinate system varies by year. Locations have been plotted using ESRI software and visually verified for accuracy. Location coordinates for samples collected along a measured stratigraphic section reflect the GPS reading at the base of the measured section.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This publication is a DGGS Raw Data File (RDF). The RDF series is intended for reports that present raw field data and analytical results with limited or no interpretation by DGGS staff or project collaborators. The report and accompanying data have been evaluated by project staff for general readability and logical consistency but have not undergone technical peer review. This data release is complete.
  5. How consistent are the relationships among the observations, including topology?
    Not applicable

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  1. Who distributes the data set? (Distributor 1 of 1)
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set? RDF 2021-13
  3. What legal disclaimers am I supposed to read?
    The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 04-Nov-2021
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.50 on Wed Nov 03 21:07:33 2021