Brennan, S.T. Buursink, M.L. Covault, J.A. Craddock, W.H. Drake II, R.M. Roberts-Ashby, T.L. Rouse, W.A. Warwick, P.D. Blondes, M.S. Freeman, P.A. Cahan, S.M. DeVera, C.A. Lohr, C.D. Tagle, N.B. Fierro, E. 20250314 publication USGS Open-File Report 2012-1024 Reston, Virginia U.S. Geological Survey Carbon Dioxide Storage Resources - California Basins: Chapter Q, Spatial Data https://doi.org/10.5066/P1KEV3C2 Warwick, P.D. (editor) Corum, M.D. (editor) 20120330 publication USGS Open-File Report 2012-1024 Reston, Virginia U.S. Geological Survey Warwick, P.D., and Corum, M.D., eds., 2012, Geologic framework for the national assessment of carbon dioxide storage resources: U.S. Geological Survey Open-File Report 2012–1024, available at https://dx.doi.org/10.3133/ofr20121024. https://dx.doi.org/10.3133/ofr20121024 This data release provides shapefiles that represent storage assessment units (SAUs) and drilling-density cells in the Central California Coast, Los Angeles, Sacramento, San Joaquin, and Ventura Basins of California in the United States. The SAU is the fundamental unit used in the National Assessment of Geologic Carbon Dioxide Storage Resources project for the assessment of geologic CO2 storage resources. The SAU is shown here as a geographic polygon interpreted, defined, and mapped by the geologist responsible for the assessment interval. Individual SAUs are defined on the basis of common geologic and hydrologic characteristics. The resource that is assessed is the mass of CO2 that can be stored in the technically accessible pore volume of a storage formation. The technically accessible storage resource is one that may be available using present-day geological and engineering knowledge and technology for CO2 injection into geologic formations and therefore is not a total in-place resource estimate. The SAU boundary is defined geologically as the limits of the geologic elements that define the SAU, such as limits of reservoir rock, geologic structures, depth, and seal lithologies. The only exceptions to this are SAUs that border the international, or Federal-State water boundary. In these cases, the international or Federal-State water boundary forms part of the SAU boundary. Drilling-density cell maps show the number of wells that have been drilled into the SAU. Each 1-square-mile cell has a count for the number of unique well boreholes drilled into the SAU. For a given sedimentary basin, the National Assessment of Geologic Carbon Dioxide Storage Resources project identifies SAUs containing the potential for storage and sequestration of carbon dioxide. Proprietary well header data from IHS ENERDEQ through 2010 were queried to determine which wells were drilled into specific SAUs. The coordinates of wells are proprietary and cannot be released; however, counts of the number of wells per square mile are presented in the well drilling density data layer. The purpose of these shapefiles is to define and illustrate the geographic extent and geologic boundaries of the SAUs and drilling-density cells within the sedimentary basin. The purpose of the drilling-density cell shapefiles is to identify the amount of drilling that has occurred in the California Basins through 2010. Drilling-density is the number of unique well boreholes drilled per square-mile cell into the SAU as reported to or collected by IHS, Inc. SAU polygon and drilling-density cell shapefiles were generated for each SAU as required for the National Assessment of Geologic Carbon Dioxide Storage Resources project. In 2007, the Energy Independence and Security Act (Public Law 110-140; URL https://www.federalregister.gov/articles/2010/07/08/2010-16236/energy-independence-and-security-act-pub-l-110-140) authorized the USGS to conduct a national assessment of geologic storage resources for CO2. The storage assessment units were used as the fundamental units for the assessment of CO2 geologic storage resources. The zip files provided in this data release product contain data available in ESRI shapefile format. The user must have software capable of uncompressing the zipped file and displaying the shapefile. In lieu of ArcGIS, the user may utilize another GIS application package capable of importing the data. You are currently viewing the primary metadata file for this data release. Please review the detailed descriptions and definitions provided in the metadata files in the SAU and Cell folders within each of the basin folders for information about the meanings of the values which appear as labels, fields, and table entries within each dataset. 2025 publication date Complete As needed -125.7715 -113.8623 42.0982 31.0906 ISO 19115 Topic Category boundaries Energy Keywords Research Thesaurus National Assessment of Geologic Carbon Dioxide Storage Resources U.S. Geological Survey World Energy Region 5 CO2 Storage Resources Carbon Dioxide Resource Assessment Earth Science Natural Resources U.S. Geological Survey USGS Storage Assessment Unit Drilling-density Cell Map USGS Metadata Identifier USGS:67c5c721d34ea599a3b991e1 USGS thesaurus United States California Augmented FIPS 10-4, and FIPS 6-4, version 1.0 US06 National Assessment of Geologic Carbon Dioxide Storage Resources C501101 = Central California Coast Basins C501401 = Los Angeles Basin C500901 = Sacramento Basin C501001 = San Joaquin Basin C501301 = Ventura Basin None - Free Keywords U.S. Geological Survey World Energy Region 5 None. Please see 'Distribution Info' for details. None. Users of this geospatial database and geologic information derived therefrom should acknowledge the U.S. Geological Survey as the source of the data. Although software enables a user to display images at various scales, map data in this report should not be used at scales greater than 1:24,000. Peter D Warwick U.S. Geological Survey, Geology, Energy & Minerals Science Center Research Geologist mailing

Mail Stop 954, 12201 Sunrise Valley Drive

Reston Virginia 20192 U.S.A. 703-648-6469 703-648-6383 pwarwick@usgs.gov Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 The attribute accuracy for each of the datasets contained in this data release are described in the metadata files associated with each dataset. The logical consistency for each of the datasets contained in this data release are described in the metadata files associated with each dataset. The completeness for each of the datasets contained in this data release are described in the metadata files associated with each dataset. The positional accuracy for each of the datasets contained in this data release are described in the metadata files associated with each dataset. Not Applicable The process steps for each of the datasets contained in this data release are described in the metadata files associated with each dataset. 2024 Vector Complete chain 32 0.000001 0.000001 Decimal degrees North American Datum of 1983 (NAD 83) Geodetic Reference System 1980 6378137.000000 298.257222 You are currently viewing the primary metadata file for this data release. Please review the detailed descriptions and definitions provided in the metadata files that are located in the SAU and Cell folders within each of the basin folders, for information about the meanings of the values which appear as labels, fields, and table entries within each dataset. Please review the 'Identification' section of this primary metadata record for citation information. GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it may also contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. Digital Data https://doi.org/10.5066/P1KEV3C2 None 20250314 Steven M Cahan U.S. Geological Survey, Geology, Energy & Minerals Science Center Cartographer mailing

Mail Stop 954, 12201 Sunrise Valley Drive

Reston Virginia 20192 U.S.A. 703-648-6435 703-648-6383 scahan@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998