3 Files: Volume 1: Central California. Volume 2: Southern, Central Coastal, and Offshore California. Volume 3: Northern California. Contour maps, cross section, data sheets and representative well logs for California’s oil and gas fields.

Metadata for 60 30x60 minute, 1:100,000, geologic quadrangle maps for California.

Metadata for 60 7.5 minute, 1:24000, geologic quadrangle maps for California.

This spreadsheet is a compilation of Well header information compiled by the California Division of Oil, Gas and Geothermal Resources, published as a Web feature service for the National Geothermal Data System. The document contains 8 worksheets, including information about the template, notes related to revisions of the template, Resource provider information, the data, a field list (data mapping view) and a worksheet with vocabularies for use in populating the spreadsheet (data valid terms). Data from 23,198 wells are included. Fields found in the template are: HeaderURI, WellName , APINo, OtherID, OtherName, BoreholeName, ParentWellURI, Operator, MineralOwner, Driller, LeaseName, SpudDate, EndedDrillingDate, DrillingMethod, WellType, Status, CommodityOfInterest, StatusDate, Function, Production , ProducingInterval , ReleaseDate, County, State, Field, OtherLocationName, PLSS_Meridians, TWP, RGE, Section_, SectionPart, Parcel, UTM_E, UTM_N, UTMDatumZone, LatDegree, LongDegree, SRS, LocationUncertaintyStatement, LocationUncertaintyCode, LocationUncertaintyRadius, DrillerTotalDepth, DepthReferencePoint, LengthUnits, WellBoreShape, TrueVerticalDepth, ElevationKB, ElevationDF, ElevationGL, FormationTD, BitDiameterCollar, BitDiameterTD, DiameterUnits, RelatedResource, Notes, CasingLogger, CasingBottomDepthDriller, CasingTopDepth, CasingPipeDiameter, CasingWeight, CasingWeightUnits, CasingThickness and InformationSource.

Geothermal Administrative Boundaries (Fields). Digital well locations can be found in a compressed EXE file that contains the well location database geothermal wells in the state of California. The data contained in the dataset includes Geothermal field polygons names, and area.The file should be downloaded to your computer, then uncompressed by double clicking on it. The file will extract into a DBF file that can be imported into your mapping software. The software used by the Division of Oil, Gas, & Geothermal Resources to prepare the maps is MapInfo, but other mapping software should be able to import the DBF files. The information contained in the file includes API number, operator, well name and number, section, township, and range, and the latitude and longitude (the map projection used is Latitude/Longitude-NAD27 for Continental United States).Projection: Lat/Long; Datum: NAD 27, Clark 1866; Units: Feet; Coverage: State of California

Data collected since 1985 from test drilling, fluid sampling, and geologic and geophysical investigations provide a clearer definition of the hydrothermal system in Long Valley caldera than was previously available. This information confirms the existence of high-temperature (> 200°C) reservoirs within the volcanic fill in parts of the west moat. These reservoirs contain fluids which are chemically similar to thermal fluids encountered in the central and eastern parts of the caldera. The roots of the present-day hydrothermal system (the source reservoir, principal zones of upflow, and the magmatic heat source) most likely occur within metamorphic basement rocks beneath the western part of the caldera. Geothermometer-temperature estimates for the source reservoir range from 214 to 248°C. Zones of upflow of hot water could exist beneath the plateau of moat rhyolite located west of the resurgent dome or beneath Mammoth Mountain. Lateral flow of thermal water away from such upflow zones through reservoirs in the Bishop Tuff and early rhyolite accounts for temperature reversals encountered in most existing wells. Dating of hot-spring deposits from active and inactive thermal areas confirms previous interpretations of the evolution of hydrothermal activity that suggest two periods of extensive hot-spring discharge, one peaking about 300 ka and another extending from about 40 ka to the present. The onset of hydrothermal activity around 40 ka coincides with the initiation of rhyolitic volcanism along the Mono-Inyo Craters volcanic chain that extends beneath the caldera's west moat.

This is the California document metadata as an Excel files listing all documents gathered for Year 1 of the DOE NGDS project. Documents available in the USGIN catalog.

Collection of 80 Temperature depth logs from a geothermal well field in Long Valley, California. Spreadsheets include temperature at depth and graphs of data. Data courtesy of the US Geological Survey.

This Geothermal Permitting Guide was created as a reference tool for geothermal stakeholders interested in developing low temperature direct use and/or power production projects. It addresses the environmental regulatory requirements beginning after acquisition of the land and/or mineral rights. Organized by development activity, it begins with resource exploration and continues to well abandonment and project closure. No one set of standard regulations applies to geothermal projects due to the differences in land and/or mineral rights ownership, location and resource chemistry. Geothermal resources in California occur in disparate environments from mountainous to desert terrains. The resource also differs from being liquid dominated high or low temperature to steam-dominated high temperature. Regional regulators such as counties, regional water quality control boards and air districts develop regulations based on the needs of their jurisdictions. The document contains websites and regulatory citations as statutes and regulations change.

PROGRAM HIGHLIGHTS: GEOTHERMAL DRILLING ACTIVITY In 2008, 32 new high-temperature geothermal wells were drilled in California compared to 12 wells drilled in 2007. Twenty- two of these wells were drilled in the Brawley field, 3 in the Salton Sea field and 7 at The Geysers (Figure 1). Total footage drilled in 2008 increased 5.7 times over the total footage drilled in 2007-- 194,758 feet ompared to 49,355 feet (Figure 2). The need for sustainable power set against the turmoil of the world’s economies created a chaotic 2008. What 2009 will bring in terms of developing geothermal projects is uncertain. However, one thing is certain, the increasing population’s need for electricity. This need alone would seem to indicate increased geothermal development in California especially in areas of known potential. GEOTHERMAL REGULATIONS The regulations used by Division staff to regulate geothermal wells in California were updated in 2008. Requirements were added for the maintenance of leases, well construction, spill contingency plans, and subsidence monitoring. Definitions were made clearer for observation wells and injection projects. CALIFORNIA ENVIRONMENTAL QUALITY ACT (CEQA) In 2008, no new applications were received. ENVIRONMENTAL AWARDS The Geysers Power Company, LLC (Calpine Corporation) received an award from the Department of Conservation for eight years of outstanding lease-enhancement activities at The Geysers Geothermal field. Mammoth Pacific also received an outstanding lease award for its maintenance of the Casa Diablo field.