Geothermal Anomaly in the Salton Basin

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Jeffrey B. Hulen, Dennis Kaspereit, Denis L. Norton, William Osborn, and Fred S. Pulka

Publication_Date: 2003

Title: Geothermal Anomaly in the Salton Basin

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

http://www.institute.redlands.edu/salton/downloads/shapefiles/SS_GeothermalAnomaly.zip

Description:

Abstract:

Interim results of a new conceptual modeling effort for the Salton Sea geothermal field (SSGF), in the Salton Trough of southernmost California, show that this resource: (1) is hotter at depth (up to at least 389 degrees Centigrade at 2 km) than initially thought; (2) is probably driven by a still-cooling felsic intrusion rather than (or in addition to) the primitive mafic magmas previously invoked for this role; (3) may be just the most recent phase of hydrothermal activity initiated at this site as soon as the Trough began to form ~4 m.y. ago; (4) is thermally prograding; and (5) in spite of 30 years' production has yet to experience significant pressure declines. Thick (up to 400 m) intervals of buried extrusive rhyolite are now known to be common in the central SSGF, where temperatures at depth are also the hottest. The considerable thicknesses of these concealed felsic volcanics and the lack of corresponding intermediate-composition igneous rocks imply coeval granitic magmas that probably originated by crustal melting rather than gabbroic magmatic differentiation. In the brine-saturated, Salton Trough sedimentary sequence, granitic plutons inevitably would engender convective hydrothermal systems. Results of preliminary numerical modeling of a system broadly similar to the one now active in the SSGF suggest that a still-cooling felsic igneous intrusion could underlie deep wells in the central part of the field by no more than a kilometer. The model results also indicate that static temperature profiles for selected Salton Sea wells could have taken 150,000 to 200,000 years to develop, far longer than the 20,000 years cited by previous investigators as the probable age of the field. The two viewpoints conceivably could be reconciled if the likely long hydrothermal history here were punctuated rather than prolonged. Configurations of the temperature profiles indicate that portions of the current Salton Sea hydrothermal system are still undergoing thermal expansion. A newly consolidated, field-wide reservoir database for the SSGF has enabled us to reassess the field's ultimate resource potential with an unprecedented level of detail and confidence. The new value, 2330 MWe (30+ year lifetime assured) closely matches an earlier estimate of 2500 MWe (Elders, 1989). If this potential were fully developed, the SSGF might one day satisfy the household electrical-energy needs of a fourth the present population of the State of California.

Purpose:

This dataset was developed to provide a cartographic representation of the shallow gradient geothermal anomaly that bounds the Salton Sea Geothermal Field. This delineation includes the total resource area, including the proven plus the potential to probable areas with a total production estimated at 2330 MWe. This depiction was required to evaluate its impact on potential mitigation measures in the restoration of the Salton Sea, given its location near the mouth of the Alamo River and proximity to desalination plants or other facilities proposed for the restoration of the Salton Sea.

Supplemental_Information:

This data, corresponding to the mapped edges of the entire geothermal anomaly, was rectified to other geospatial layers, especially via infrastructure, i.e. road intersections. This rectification is subject to coordinate revision.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2003

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -115.688386

East_Bounding_Coordinate: -115.556424

North_Bounding_Coordinate: 33.257054

South_Bounding_Coordinate: 33.128248

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: geothermal

Theme_Keyword: hydrothermal

Theme_Keyword: electricity

Theme_Keyword: total resource area

Theme_Keyword: potential to probable resource area

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: Geological and geophysical

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Salton Sea geothermal field

Place_Keyword: Salton Sea

Place_Keyword: Salton Trough

Place_Keyword: California

Access_Constraints: None.

Use_Constraints: None'

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Althiser, Kenneth C.

Contact_Organization: Redlands Institute

Contact_Position: Senior GIS Analyst

Contact_Voice_Telephone: (909) 335-5268

Browse_Graphic:

Browse_Graphic_File_Name: None

Data_Set_Credit:

This data was rectified by staff of the Redlands Institute from information provided in the source reference. This rectification is an interpretation by Institute staff, and is subject to revision by the authors or other appropriate, qualified professionals.

Security_Information:

Security_Classification_System: None

Security_Classification: Unclassified

Security_Handling_Description: None

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780

Cross_Reference:

Citation_Information:

Title: None

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: All attributes fields have been filled.

Logical_Consistency_Report:

Polygon topology is present; the data was processed through the standard ArcInfo and ArcEdit checks on polygon topology.

Completeness_Report:

The file is a complete representation of the currently known boundary of the geothermal anomaly located at the south end of the Salton Sea, also known as the Salton Sea Geothermal Field.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: Data is good to +/- 10 meters.

Lineage:

Process_Step:

Process_Description:

The image was taken from the mentioned reference, and photorectified to nearby infrastructure using GIS tools. Topology was achieved through use of the ArcInfo command BUILD.

Source_Used_Citation_Abbreviation: m:\projects\us_filter\geothermal\geo_region

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Althiser, Kenneth C.

Contact_Organization: Redlands Institute

Contact_Position: Senior GIS Analyst

Contact_Voice_Telephone: (909) 335-5268

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation:

M:\projects\cd_atlas\gis\env\hydro\geothermal\geo_region\metadata.xml

Process_Step:

Process_Description: Dataset moved.

Source_Used_Citation_Abbreviation: R:\temp\SS\therm_anomaly_polygon

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

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Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

Server=ri-dbserv-2.institute.redlands.edu; Service=5151; Database=sde; User=sde; Version=sde.DEFAULT

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

Server=ri-dbserv-2.institute.redlands.edu; Service=5181; Database=sde_temp; User=sde_admin; Version=sde.DEFAULT

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

Server=ri-dbserv-2; Service=5151; Database=sde; User=sde_admin; Version=sde.DEFAULT

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

Server=ri-dbserv-2.institute.redlands.edu; Service=5185; Database=sde_ssdp; User=sde_admin; Version=sde.DEFAULT

Cloud_Cover: N/A

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 1

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Label point

Point_and_Vector_Object_Count: 1

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Point_and_Vector_Object_Count: 1

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 4

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Resolution: 1.000000

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: SS_GeothermalAnomaly

Entity_Type_Definition: Polygon Attribute Table

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: SHAPE_LENG

Attribute:

Attribute_Label: OBJECTID

Attribute:

Attribute_Label: THERM_AN_1

Attribute:

Attribute_Label: THERM_ANOM

Attribute:

Attribute_Label: OBJECTID_1

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE_area

Attribute_Definition: Area of feature in internal units squared.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically generated.

Attribute:

Attribute_Label: SHAPE_len

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 0.003

Metadata_Reference_Information:

Metadata_Date: 20060906

Metadata_Review_Date: 20030728

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Redlands Institute

Contact_Person: Althiser, Kenneth C.

Contact_Position: Senior GIS Analyst

Contact_Address:

Address_Type: mailing and physical address

Address: 1200 East Colton Avenue

Address: PO Box 3080

City: Redlands

State_or_Province: CA

Postal_Code: 92373

Country: United States of America

Contact_Voice_Telephone: (909) 335-5268

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None

Metadata_Security_Information:

Metadata_Security_Classification_System: None

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description: None

Metadata_Extensions:

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Profile_Name: ESRI Metadata Profile