Janice M. Gillespie Tracy A. Davis Lyndsay B. Ball Phillip J. Herrera Zachary Wolpe Victor Medrano Maryanne Bobbitt Michael J. Stephens 20190423 Tabular digital data San Diego, CA U.S. Geological Survey data release https://doi.org/10.5066/P90QH6CI Janice M. Gillespie Tracy A. Davis Michael J. Stephens Lyndsay B. Ball Matthew K. Landon 201909 publication Environmental Geosciences vol. 26, issue 3 n/a American Association of Petroleum Geologists AAPG/Datapages ppg. 73-96 https://doi.org/10.1306/eg.02271918009 The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board compiled and analyzed data for mapping groundwater salinity and characterizing aquifer systems in and near selected oil and gas fields in California. Data for the Lost Hills, North Belridge, and South Belridge oil fields include production and injection volumes, oil show data, formation pressure data, digitized borehole geophysical data, geochemical analyses of produced water samples, geological formation depths, and geophysical data associated with estimating groundwater total dissolved solids (TDS) of formation water. All data reported here are used in an accompanying interpretive manuscript. These data have been compiled from many sources and span several decades. Some of these data have been in archived scanned pages in raster format on the California Division of Oil, Gas, and Geothermal Resources (DOGGR) website, but now have been compiled into computer readable numerical data sets. Other data were created by this project. All the data compiled and analyzed are part of the California State Water Resources Control Board’s Program of Regional Monitoring of Water Quality in Areas of Oil and Gas Production and the USGS California Oil, Gas, and Groundwater (COGG) program. These data were compiled to describe aquifer architecture and groundwater quality in the Lost Hills and Belridge oil fields area. 2019 publication date Complete None planned -119.8322 -119.6426 35.7169 35.3977 ISO 19115 Topic Category inlandWaters None Aquifer architecture Groundwater salinity Oil and gas Borehole geophysics USGS Metadata Identifier USGS:5b4d123ce4b06a6dd17c59ab None Lost Hills North Belridge South Belridge Central Valley California none None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations. Matthew K Landon PACIFIC REGION Supervisory Hydrologist mailing and physical

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San Diego CA 92101-0821 United States 619-225-6109 landon@usgs.gov California State Water Resources Control Board (SWRCB); California Department of Conservation, Division of Oil, Gas, and Geothermal Resources (DOGGR); U.S. Geological Survey; California State University, Sacramento, Water Resources Group; California Department of Water Resources (DWR); DOGGR Underground Injection Control (UIC) program Crangle, R.D. 2007 publication https://pubs.usgs.gov/of/2007/1142/ No formal attribute accuracy tests were conducted Data were checked for duplication and values fell within expected ranges. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable. California Department of Conservation, Division of Oil, Gas, and Geothermal Resources 2016 raster digital data California California Department of Conservation, Division of Oil, Gas, and Geothermal Resources ftp://ftp.consrv.ca.gov/pub/oil/chemical_analysis Digital and/or Hardcopy Unknown Unknown ground condition DOGGR chemical analysis Data were entered by hand into spreadsheets from scanned lab reports. The well name, API number, location, perforation depth, and formations were found on the original well records available from DOGGR (https://secure.conservation.ca.gov/WellSearch/). U.S. Geological Survey and the California State Water Resources Control Board 2018 tabular digital data California California State Water Resources Control Board http://geotracker.waterboards.ca.gov/ Digital and/or Hardcopy Unknown Unknown ground condition GeoTracker Geochemical data from groundwater wells originated from this dataset. California Department of Conservation, Division of Oil, Gas, and Geothermal Resources 2015 publication California California Department of Conservation, Division of Oil, Gas, and Geothermal Resources ftp://ftp.consrv.ca.gov/pub/oil/Summary_of_Operations Digital and/or Hardcopy Unknown Unknown ground condition DOGGR summary of operations Pre-1977 production and injection values were extracted from annual reports for each well field available from Summery of Operation documents. California Department of Conservation, Division of Oil, Gas, and Geothermal Resources Unknown raster digital data California California Department of Conservation, Division of Oil, Gas, and Geothermal Resources http://www.conservation.ca.gov/dog/pages/wellfinder.aspx Digital and/or Hardcopy Unknown Unknown ground condition DOGGR Well Finder Scanned files of well data, including depths of perforations, geologic markers, oil show data from core samples, pressure test profiles, and well geophysical logs were downloaded from the DOGGR website. Information from these pages were added as attribute data in the study. Scanned files of well data, including depths of perforations, geologic markers, oil show data from core samples, pressure test profiles, and well geophysical logs were downloaded from the DOGGR website (http://www.conservation.ca.gov/dog/pages/wellfinder.aspx). Depths of perforations, geologic markers, and oil shows were manually entered into spreadsheets. Neuralog software (http://www.neuralog.com/pages/NeuraLog.html, version 1.0.0.1) was used to digitize the geophysical log image files. The digital output from the software were then zipped into a file and provided with this data release. The output file format (Log ASCII Standard (las)) is an oil industry standard and is described in Crangle, 2007. Production and injection volumes were also downloaded from the DOGGR website for 1977-2009; pre-1977 values prior to that time where extracted from annual reports for each well field available from Summery of Operation documents (ftp://ftp.consrv.ca.gov/pub/oil/Summary_of_Operations/) and annual reports (http://www.conservation.ca.gov/dog/pubs_stats/annual_reports/Pages/annual_reports.aspx). 2018 In September 2019, the Data Release was updated to version 2.0. Data used in the Gillespie and others (in press) larger work was not included in version 1 of this data release. This update is being made to add data described in the larger work. The changes include adding two spreadsheets of data ("wells affected by disposal sumps.xlsx" and "wells affected by injection.xlsx") and a mislabeled well number in "geophysical_log_analysis.xlsx" was updated. The original log analysis file is available upon request from Michael Stephens at mjstephens@usgs.gov. 2019 In 2022, the data release was updated to version 3.0. The update purpose was to correct some erroneous data points found in the “geologic_markers.xlsx” file. This file was updated to “geologic_markers (ver 2).xlsx”. One well (02975040) was added to “geophysical_log_analysis (ver 3).xlsx”. The changes from version 2 to version 3 were: • 02937672: Amnicola base from 1,310 ft to 1,348 ft. • 02935522: Removed well. • 02909463: Removed well. • 03034569: Changed longitude from -119.717958 to -119.7356734. • 02929577: Changed Tulare base from 2,074 ft to 1,717 ft. • 02936507: Removed the middle Tulare clay pick. • 02945653: Removed the middle Tulare clay pick. • 03012267: Removed the middle Tulare clay pick. • 02975040: Removed the base of <10,000 mg/L water. • 02977811: Changed longitude from -119.672067 to -119.6627439. • 02977811: Changed latitude from 35.528805 to 35.5433201. • 02989264: Changed middle Tulare clay top from 150 ft to 348 ft. • 02903874: Changed middle Tulare clay top from 327 ft to 464 ft. • 02975040: Added well. • 02974435: Added well. 2022 Vector G-polygon 3 0.0197670583 0.0241811234 Decimal seconds North_American_Datum_1983 GRS_1980 6378137.0 298.257222101 geochemistry_belridge.xlsx Table containing attribute information associated with total dissolved solid measurements from wells. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ well_number A number assigned to the well by the well operator. Project defined The number of the well. elevation The elevation, in feet relative to sea level, of the well's kelly bushing, derrick floor, or ground level. This is used as a proxy for the elevation of the well. Project defined na na feet, relative to sea level latitude The latitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na decimal degrees longitude The longitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na decimal degrees date_tested The date of the laboratory analysis of total dissolved solids of the sample. Project defined na na perfd_int The interval of the perforation of the well, in feet below ground surface. Project defined na na feet, relative to ground level top_perf The most shallow depth of the perforated interval of the well in feet below the ground surface. Project defined na na feet, relative to ground level TDS The laboratory measurement of total dissolved solids from produced water samples in parts per million. Project defined na na parts per million (ppm) date_perf The date that the well was perforated. Project defined na na formation The name of the geologic formation from which the produced water sample originated. Project defined The name of the formation sampled. formation1 A more detailed description of the location within the geologic formation from which the produced water sample originated. Not always available. Parenthesis indicate there was uncertainty in the location reported. Letters (i.e. D, E) are widely used used names for zones within the formation. Project defined A more detailed name of the formation sampled. pct_error The percent error of the charge balance found using the cation and anion milliequivalents. Project defined na na percent geochemistry_lost_hills.xlsx Table containing attribute information associated with total dissolved solid measurements of produced water samples from oil wells and groundwater wells within the oil field used in salinity mapping. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. Value is blank for groundwater wells. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ well_name Name of the groundwater well. Value is blank for oil wells. Project defined The name of the well. well_number A number assigned to the oil well by the well operator. Project defined The number of the well. elevation The elevation, in feet relative to sea level, of the well's kelly bushing, derrick floor, or ground level. This is used as a proxy for the elevation of the well. Project defined na na feet, relative to sea level latitude The latitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na decimal degrees longitude The longitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na decimal degrees date_tested The date of the laboratory analysis of total dissolved solids of the sample. Project defined na na perf_int The interval of the perforation of the well, in feet below ground surface. Project defined na na feet, relative to ground level top_perf The most shallow depth of the perforated interval of the well. Project defined na na feet, relative to ground level TDS The laboratory measurement of total dissolved solids from produced water and groundwater samples in parts per million. Project defined na na parts per million (ppm) date_perf The date that the well was perforated. Project defined na na formation The name of the geologic formation from which the produced water sample originated. Project defined The name of the formation sampled. formation1 A more detailed description of the location within the geologic formation from which the produced water sample originated. Not always available. Parenthesis indicate there was uncertainty in the location reported. Letters (i.e. D, E) are widely used used names for zones within the formation. Project defined A more detailed name of the formation sampled. pct_error The percent error of the charge balance found using the cation and anion milliequivalents. Project defined na na percent geologic_markers (ver 2).xlsx Location coordinates and depths for selected geologic formations, depth to 10,000 ppm TDS, and the desaturated zone. The depths of these features were determined from borehole geophysical log analysis. Blank cells indicate data not available. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. Value is blank for groundwater wells. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ well_name Name of the groundwater well. Producer Defined The name of the well. latitude The latitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na decimal degrees longitude The longitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na decimal degrees elevation The elevation in feet relative to sea level. Producer Defined na na feet, relative to sea level elevation_ref The reference point for the elevation data. Producer Defined DF Derrick floor Producer defined KB Kelly bushing Producer defined GL Ground level Producer defined MAT Drilling pad Producer defined depth_to_10k The depth, in feet below the ground surface, that groundwater reaches 10,000 ppm TDS. Project defined na na parts per million (ppm) desat_base The depth, in feet below the ground surface, at which the water table is first observed. Project defined na na feet, relative to ground level Corcoran_top The depth, in feet below the ground surface, that the top of the Corcoran Clay is present. Project defined na na feet, relative to ground level Corcoran_base The depth, in feet below the ground surface, that the base of the Corcoran Clay is present. Project defined na na feet, relative to ground level Mid_Tulare_Clay_top The depth, in feet below the ground surface, that the top of the Mid-Tulare Clay is present. Project defined na na feet, relative to ground level Amnicola_top The depth, in feet below the ground surface, that the top of the Amnicola clay is present. Project defined na na feet, relative to ground level Amnicola_base The depth, in feet below the ground surface, that the base of the Amnicola clay is present. Project defined na na feet, relative to ground level Tulare_base The depth, in feet below the ground surface, that the base of the Tulare Formation is present. Project defined na na feet, relative to ground level oil_shows.xlsx Table recording the depth intervals of oil shows from various sources. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ show_ref The reference for the show information in adjacent column. This column contains five indicators: 1) SHOWFLAG indicates the start of a new well, 2) SHOWFT indicates the total length of the oil show interval in feet, 3) SHOWMIN indicates the shallowest depth, in feet below the ground surface, of the oil show interval, 4) SHOWMAX indicates the deepest depth, in feet below the ground surface, of the oil show interval, 5) SHOWTYPE indicates the source of the oil show depths. SWC = sidewall core, CONV = conventional core. Project defined The show reference of the well. show_data The depths, in feet below the ground surface, of oil show intervals. See "show_ref" column explanation for further details. Project defined The show data of the well. production_injection_data.xlsx Table of production and injection data for North and South Belridge and the Lost Hills oil fields. Project defined year The year that the production or injection occurred. Project defined na na LH_NB_SB_oil Amount of oil produced in the Lost Hills, North Belridge, and South Belridge fields in barrels. Note: This column contains oil volumes from all three oil fields because the volumes were reported together until 1930. Producer Defined na na bbl LH_NB_SB_water Amount of water produced in the Lost Hills, North Belridge, and South Belridge fields in barrels. Note: This column contains water volumes from all three oil fields because the volumes were reported together until 1930. Producer Defined na na bbl NB_SB_oil Amount of oil produced in the North Belridge and South Belridge fields in barrels. Note: This column contains oil volumes from both oil fields because the volumes were reported together until 1942. Producer Defined na na bbl NB_SB_water Amount of water produced in the North Belridge and South Belridge fields in barrels. Note: This column contains water volumes from both oil fields because the volumes were reported together until 1942. Producer Defined na na bbl NB_oil Amount of oil produced in the North Belridge field in barrels. Project defined na na bbl NB_water Amount of water produced in the North Belridge field in barrels. Project defined na na bbl NB_WD Amount of water injected labeled WD (water disposal) in the North Belridge field in barrels. Project defined na na bbl NB_water_flood Amount of water injected labeled WF (water flood) in the North Belridge field in barrels. Note: Column contains both steam and water after 1977. Project defined na na bbl NB_steam Amount of steam injected in the North Belridge field in Mcf (the volume of 1,000 cubic feet). Project defined na na Mcf (the volume of 1,000 cubic feet) SB_oil Amount of oil produced in the South Belridge field in barrels. Project defined na na bbl SB_water Amount of water produced in the South Belridge field in barrels. Project defined na na bbl SB_WD Amount of water injected labeled WD (water disposal) in the South Belridge field in barrels. Project defined na na bbl SB_water_flood Amount of water injected labeled WF (water flood) in the South Belridge field in barrels. Note: Column contains both steam and water after 1977. Project defined na na bbl SB_steam Amount of steam injected in the South Belridge field in Mcf (the volume of 1,000 cubic feet). Project defined na na Mcf (the volume of 1,000 cubic feet) Lost_Hills_oil Amount of oil produced in the Lost Hills field in barrels. Project defined na na bbl Lost_Hills_water Amount of water produced in the Lost Hills field in barrels. Project defined na na bbl Lost_Hills_WD Amount of water injected labeled WD (water disposal) in the Lost Hills field in barrels. Project defined na na bbl Lost_Hills_water_flood Amount of water injected labeled WF (water flood) in the Lost Hills field in barrels. Note: Column contains both steam and water after 1977. Project defined na na bbl Lost_Hills_steam Amount of steam injected in the Lost Hills field in Mcf (the volume of 1,000 cubic feet). Project defined na na Mcf (the volume of 1,000 cubic feet) pressure_tests.xlsx Table of geologic formation pressure test data. All data are from the year 1985. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ SI_pressure Shut-in pressure data. All these data are RFT (repeat formation test). During shut-in periods, the flowline valve is closed. Ideally, pressure in the closed tool gradually builds up until it reaches equilibrium with the pressure of the isolated formation. rendering a pressure value for the formation at the tested depth. Project defined na na psi (pounds per square inch) depth The depth, below ground level, that the pressure test was performed. Project defined na na feet below land surface geophysical_log_analysis.xlsx Table of data used in estimating TDS from "clean sand" depths using geophysical well log measurements. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ well_name Name of the well if the well does not have an API number. Project defined The name of the well. omitted Whether or not the data were used in the analysis. See criteria below. Project defined TRUE Rows marked "TRUE" were not used in the analysis because the data did not meet data quality standards of the study. The data failed quality standards because 1) the caliper on the well log indicated a problem therefore inaccurate data may have been recorded, 2) the sand bed was too thin (~ <10 ft), 3) the formation was too shaly, or 4) porosity was over 0.42. Excessive shale content determined by the "V_shale" data (>0.25). Project defined FALSE Rows marked "FALSE" were used. Producer defined formation The name of the geologic formation or zone from which the geophysical data originated. Project defined The name of the geologic formation. show_type The source of the oil/water show data. SWC is sidewall core. Project defined mudlog The oil show data source was a mudlog. Producer defined SWC The oil show data source was a side wall core analysis. Producer defined show Whether the show was recorded as oil or wet. Only wet sands were used in the analysis. Blanks represent no data or presumed wet. Project defined Show information of the well. perfd_int The interval of the perforation of the well, in feet below ground surface. Project defined na na feet, relative to ground level depth The depth, in feet below the ground surface, that was selected as a "clean sand". At this depth, geophysical data were collected and used to estimate TDS. Project defined na na feet, relative to ground level dphi The density porosity read from the well log. Project defined na na unitless nphi The neutron porosity read from the well log. Project defined na na unitless nphi_dphi_diff The difference between neutron and density porosity. Project defined na na unitless V_shale The estimated volume of shale content at a given depth. This is calculated by assuming the largest difference between neutron and density porosity in the well represents 100% shale. Then dividing the difference at any given depth by this largest separation. Project defined na na unitless phi_pred The estimated porosity found by weighting density porosity twice as much as neutron porosity. Density was used if neutron was not available. Project defined na na unitless dres The deep-reading resistivity read from the well log in ohm-m. Project defined na na ohm-m a The "a" parameter in the Archie Equation (unitless) used in the TDS calculations. See "archie_m_core_analysis" file. Project defined na na unitless m The "m" parameter in the Archie Equation (unitless) used in the TDS calculations. See "archie_m_core_analysis" file. Project defined na na unitless R_w_pred The estimated resistivity (ohm-m) of the formation water at the formation temperature. Project defined na na ohm-m R_w75_pred The estimated resistivity (ohm-m) of the formation water at 75 degrees Fahrenheit. Project defined na na ohm-m surface_temp The estimated temperature, in degrees Fahrenheit, of the ground surface to calculate a subsurface temperature gradient. Project defined na na degrees Fahrenheit BHT_depth The depth, in feet below the ground surface, that the bottom hole temperature was recorded. Project defined na na feet, relative to ground level BHT The temperature, in degrees Fahrenheit, of the bottom of the borehole as recorded on the well log header. Project defined na na degrees Fahrenheit zone_temp_pred The estimated temperature, in degrees Fahrenheit, of the clean sand depth were TDS is to be estimated. Uses the calculated temp gradient. Project defined. na na degrees Fahrenheit temp_grad The estimated subsurface temperature gradient (temp/ft). Project defined na na degrees Fahrenheit / foot (relative to ground level) TDS_pred The estimated TDS value in parts per million using the Bateman and Konen 1977 equation. Project defined na na parts per million (ppm) depth_to_10k If marked "TRUE" the corresponding depth was used to create the depth to 10,000 ppm TDS map in related manuscript. If marked "FALSE" it was not used in the map. Project defined TRUE If marked "TRUE" the corresponding depth was used to create the depth to 10,000 ppm TDS map in related manuscript. Project defined FALSE If marked "FALSE" it was not used in the map. Producer defined field The oil field associated with the well analyzed. Producer Defined Belridge, South Well associated with the South Belridge oil field. Producer defined Belridge, North Well associated with the North Belridge oil field. Producer defined Lost Hills Well associated with the Lost Hills oil field. Producer defined archie_m_core_analysis.xlsx A table of data from a well where core analysis was performed to determine Archie Equation parameters. Project defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ depth The depth, in feet below the ground surface, from which the core sample originated. Project defined na na feet, relative to ground level temp_C The temperature, in degrees Celsius, at which the test was conducted. Project defined na na degrees Celsius R_w The resistivity, in ohm-m, that was measured from the core sample. Project defined na na ohm-m porosity The porosity measured from the core sample. Project defined na na unitless kHz The frequency of the test. Project defined na na kHz R_rock The resistivity, in ohm-m, of the water saturated rock. Project defined na na ohm-m a Archie Equation parameter "a". Held constant at one for all tests. Project defined na na unitless m Archie Equation parameter "m". This parameter is the objective of the test. Project defined na na unitless wells affected by disposal sumps.xlsx A table of data that contains oil and gas wells that have documented affects from disposal sumps. Project Defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ latitude The latitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na longitude The longitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na year_logged The year the well was logged with geophysical tools. Project Defined na na affected_intervals The depth (below ground surface / reference datum, i.e. Kelly bushing, in feet) of the interval found to be affected by disposal sumps, separated by commas. Project Defined Each interval is separated by commas. For example, 130-180, 305-330. possibly_affected The depth (below ground surface / reference datum, i.e. Kelly bushing, in feet) of the interval found to be possibly affected by disposal sumps, separated by commas. Project Defined Each interval is separated by commas. For example, 130-180, 305-330. comments This column contains comments to further clarify conditions. Project Defined CCE = Corcoran Clay Equivalent. Where present it marks the boundary between the Tulare Formation and overlying alluvium. It may serve as a barrier to downward migration of fluids. MD = measured depth WD = water disposal (by injection) ft = feet wells affected by injection.xlsx A table of data that contains oil and gas wells that have documented affects from injection. Producer Defined API_number A unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United States according to the standards of the American Petroleum Institute; the state code (04 for California), which are normally the first two digits of every API number, has been left off since all API numbers are in California. American Petroleum Institute (API) American Petroleum Institute (API) http://www.api.org/ latitude The latitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na longitude The longitude of the well in decimal degrees from the NAD83 coordinate system. California Division of Oil, Gas, and Geothermal Resources (DOGGR) na na year_logged The year the well was logged with geophysical tools. Project Defined na na affected_intervals The depth (below ground surface / reference datum, i.e. Kelly bushing, in feet) of the interval found to be affected by injection, separated by commas. Project Defined Each interval is separated by commas. For example, 130-180, 305-330. possibly_affected The depth (below ground surface / reference datum, i.e. Kelly bushing, in feet) of the interval found to be possibly affected by injection, separated by commas. Project Defined Each interval is separated by commas. For example, 130-180, 305-330. comments This column contains comments to further clarify conditions. Project Defined Oil shows and production noted within area because it makes it harder to determine whether resistivity fluctuations are caused by fresh and saline water rather than by oil and saline water--introduces more uncertainty. Well logs with 2" depth scales or resistivity scales from 0-80 ohms are difficult to interpret accurately and introduce uncertainty. U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase mailing and physical

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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. Tabular digital data None https://doi.org/10.5066/P90QH6CI None. No fees are applicable for obtaining the data set. 20220609 Michael J Stephens PACIFIC REGION Hydrologist mailing and physical

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Sacramento CA 95819 US 916-278-9240 mjstephens@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998