Hearon, J.S. [0000-0002-1370-8169] 20231030 raster digital data USGS Data Release 10.5066/P9NAFL9H Denver, Colorado U.S. Geological Survey, Central Energy Resources Science Center https://doi.org/10.5066/P9NAFL9H Jane S. Hearon 2023 publication USGS SIM 10.3133/sim3511 in review https://doi.org/10.3133/sim3511 This file contains 15 net sand isopach grids that represent the summed true vertical thickness (TVT) of sand intervals between 15 stratigraphically adjacent horizons picked on borehole geophysical logs in the Southwestern Wyoming Province. In wells where adjacent horizons are missing, no TVT value is calculated. The TVT values are a measure of vertical thickness and do not account for the structural dip of units encountered in the wellbore. The 15 stratigraphic horizons are the tops of 15 regional flooding surfaces F1-15. Net Sand was determined by normalizing gamma ray logs and using a cut-off of 85 API units and then summing each interval. For more detailed stratigraphic information, please see the associated USGS SIM file XXXX, data table, and type log image. This file is a child item of a larger data release titled "Digital Stratigraphic and Structural Grids of the Lewis Shale in the Eastern Part of the Southwestern Wyoming Province, Wyoming and Colorado". The net sand isopach grids highlight the distribution of sand over time for the Lewis Shale-Fox Hills Sandstone-Lance Formation depositional system in the eastern part of the Southwestern Wyoming Province. All picks were made by the author from borehole geophysical logs drilled for oil and gas exploration and production. These data and interpretations were collected to support a geologic assessment of the Lewis Shale as part of a broader, multi-year project to assess the various petroleum systems of the Southwestern Wyoming Province (USGS Province 37). 2023 publication date Complete None planned -109.6000 -106.4000 42.6000 39.5000 ISO 19115 Topic Category geoscientificInformation USGS Thesaurus geology sedimentology stratigraphic thickness energy resources Lewis Shale USGS Energy Resources Thesaurus Southwest Wyoming Lewis Shale USGS Metadata Identifier USGS:64f9f87dd34ed30c2054aebd Common geographic areas State of Wyoming State of Colorado Province 37 United States of America None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Jane S. Hearon U.S. Geological Survey, ROCKY MOUNTAIN REGION mailing address

Mail Stop 939, W 6th Ave & Kipling St

Lakewood CO 80225 US 303-236-1746 jhearon@usgs.gov Christopher Skinner and Benjamin Johnson for review of spatial components and data architecture. This dataset was developed on Windows 10 Enterprise using IHS Markit's Kingdom version 2020, ESRI Inc. ArcGIS Pro version 3.0.2, Interactive Petrophysics version 2023 and Microsoft Excel. No formal attribute accuracy tests were conducted. The main attribute reported in these data are the true vertical thickness, which is the thickness of a geological unit, in a well measured in the vertical direction. The attribute is determined by calculating the difference between the true vertical depth of two adjacent horizons picked on borehole geophysical logs. Their accuracy is dependent on several other attributes from the original IHS Markit (2020) data source (see horizontal and vertical positional accuracy reports below). In addition, the TVT is difficult to calculate in deviated wells that penetrate non-horizontal units. No independent data source was used to constrain the dip of geological units in the basin. The grids have been spot checked for consistency. There are no duplications or omissions of data elements. No formal topology tests were conducted, but all the grids are readable in ArcGIS Pro without topology errors. The data extend over the eastern portion of the USGS Southwestern Wyoming Province (Province 37) A formal assessment of the horizontal positional accuracy of the original IHS Markit ® (2022) data source has not been conducted. The horizontal position of the well points is derived from various sources filed with state agencies. These include land plat maps, drilling permits, drilling reports, and directional drilling surveys. A formal assessment of the vertical positional accuracy of the original IHS Markit ® (2022) data source has not been conducted. Vertical accuracy of the formation top on a borehole log is generally considered to range between 10 to 100s of feet, but this depends on many factors, including when the well was drilled and if a directional survey was acquired during the drilling. IHS Markit ® 2022 tabular digital data 15 Inverness Way East, Englewood, CO 80112 IHS Markit ® https://spglobal.com/commodityinsights Digital and/or Hardcopy 2021 2022 publication date Well header The horizontal position and the vertical datum applied to all the wells in this data release are originally derived from the IHS Markit ® (2022) data source IHS Markit ® 2022 digital .las and raster image wireline log files 15 Inverness Way East, Englewood, CO 80112 IHS Markit ® https://spglobal.com/commodityinsights Digital and/or Hardcopy 2021 2022 publication date Well logs Formation tops were picked on borehole geophysical logs downloaded from the IHS Markit ® (2022) US Well Log Catalog. The picks for all stratigraphic horizons in the "Lewis_Shale_Data_Summary.csv" data table were made using gamma ray and resistivity borehole geophysical logs from IHS Markit. This step was conducted using Kingdom software. Well header Well logs 2022 Borehole geophysical logs were normalized using Interactive Petrophysics software version 2023. Once the wells were all normalized to one another, a gamma ray cut-off of 85 API units was used to represent “sand”. This absolute value of the GR cut-off was subjective, but consistent for all the grids. 2022 Jenny LaGesse U.S. Geological Survey, ROCKY MOUNTAIN REGION mailing

Mail Stop 939, W 6th Ave & Kipling St

Lakewood CO 80225 303-236-1623 jlagesse@usgs.gov After using a gamma ray cut-off of 85 API units, true vertical thickness (TVT) values were calculated and summed by measuring the true vertical distance between adjacent stratigraphic horizons in the "Lewis_Shale_Data_Summary.csv" data table. See the Lewis_Shale_Type_Log for more information. For example, values stored in the "NET_C03" grid represent the summed true vertical distance of net sand between the top of F03 and F02. If one of the adjacent formation tops was not picked in a well, no TVT value was calculated. The grids were created in Kingdom using the “Flex Gridding” algorithm on zone calculated data. 2022 Edge effects from the gridding algorithm produced negative values on the edges of some grids. All erroneous negative values were corrected to a "0" value. 2023 Raster Grid Cell Transverse_Mercator 500000.0 0.0 0.0 -108.75 0.0 0.0 coordinate pair 0.6096 0.6096 survey feet North_American_Datum_1927 Clarke 1866 6378206.4 294.9786982 Fifteen ASCII raster files recording the summed true vertical thickness between adjacent stratigraphic horizons. No data or null values are represented with a -9999 value. Raster cell size is 5,000 feet. n/a U.S. Geological Survey GS ScienceBase mailing address

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata, and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P9NAFL9H None 20231030 Jane S. Hearon U.S. Geological Survey, ROCKY MOUNTAIN REGION mailing address

Mail Stop 939, W 6th Ave & Kipling St

Lakewood CO 80225 US 303-236-1746 jhearon@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998