RECOMPILATION OF THE
GEO-HEAT
CENTER's GEOCHEMICAL DATABASE
for the GREAT BASIN GEOTHERMAL
GIS
version 00, 12 Sept. 2003
Data Download and Documentation Page
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This database
contains fluid geochemical data from low to moderate temperature (up to 150°C)
wells and thermal springs in the Great Basin. The Great Basin subset
includes portions of the following states that fall within an expanded buffered
boundary of the Great Basin: Arizona, California, Idaho, Nevada, Oregon, Utah,
and Wyoming. In addition to geochemical analyses, the database contains
information on hole depth (for wells), flow rate, references, and geothermometer
and charge balance calculations.
Data Downloads and Documentation
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Acknowledgment of source data:
GEO-HEAT CENTER GEOCHEMICAL DATABASE
The original database was
compiled by the Geo-Heat Center, Klamath Falls, OR. in February 2002 with the
help of organizations in 16 western states that contributed data (click
here for acknowledgments of source data for the Great Basin states).
The full version of the Geo-Heat Center databases includes a database of direct
use applications, a listing of geothermal resources lying near communities, and
fluid geochemical data for many western states outside the Great Basin.
Funding for this compilation was provided by United States Department of Energy
grant DE-FG07-99ID13827 (Geo-Heat Center). The full database is available
from the Geo-Heat center on CD at a modest price at:
Geo-Heat Center
Oregon Institute of
Technology
3201 Campus Drive
Klamath Falls, OR 97601
(541) 885-1750
geoheat@oit.edu
http://geoheat.oit.edu
RECOMPILATION by GREAT BASIN CENTER FOR GEOTHERMAL ENERGY
The recompiled Great Basin database was created by merging
portions of 21 files from the original Geo-Heat database into a single
spreadsheet (3 files from each state in the buffered Great Basin boundary).
Merging was accomplished using Microsoft Access and Excel. Geothermometer
temperature estimates and a charge balance calculation have been added.
Funding for this recompilation was provided by United States Department of Energy
grant DE-FG07-99ID13827 (Geo-Heat Center) and DE-FG36-02ID14311 (Great
Basin Center for Geothermal Energy).
The Great Basin
database files:
This is a spreadsheet of well and thermal
spring geochemical analyses, including coordinates and a key to references. Geochemical
elements with reported values of “<x.xx” (with the “less than” symbol) have been
left “as is” in this database. Abbreviated references contained in this
spreadsheet correspond (in most cases) to complete references contained in the
“GeoHeat Great Basin References.pdf” file.
This is a comma-delimited ASCII text file
equivalent to “GeoHeat_GB.xls”.
This is an
ArcView and ArcGIS-compatible shapefile of the database (Lambert
projection). Missing geochemical
data are represented by “-1”. Geochemical data with “less-than” (<) symbols
have been converted to one-half the detection limit value, with the exception of
arsenic data, for which all entrees with “less than” symbols have been converted
to “-1” (no data).
GeoHeat_GB_References_v0.pdf [download]
This is a list
of references for the Geo-Heat database, listed by state. Short references
contained in the geochemical spreadsheet and shapefile can be used to look up
the full reference in this file.
DESCRIPTIONS OF GREAT BASIN GEO-HEAT CENTER DATA FILES:
This is a spreadsheet of well and thermal spring
geochemical analyses, including coordinates and references. Geochemical
elements with reported values of “<x.xx” (with the “less than” symbol) have been
left “as is” in this database. Abbreviated references contained in this
spreadsheet correspond (in most cases) to complete references contained in the
“GeoHeat Great Basin References.pdf” file.
Description of columns (fields) in the spreadsheet:
State:
Two-letter abbreviation for state.
Site_ID:
Site identification number or name. Represented as text, not a number,
because some states have alphanumeric codes for this field.
SampleNo:
Sample number. Available only for Arizona.
Date:
Date. Format varies from state to state.
Name:
Site name.
Type:
Type of sample site: CLT = commercial low-temperature; INJ = injection well; M =
mine; NLT = non-commercial low temperature; OIL = petroleum well; S = spring, SP
= spring, SW = well drilled to control spring; TG = temperature gradient well; W
= well; WW = well; X = type not confirmed.
Depth_m:
Depth of well in meters. “-1” values indicate no data.
Flow_lpm:
Flow rate in liters per minute. “-1” values indicate no data.
Latitude:
Decimal degrees of latitude.
Longitude:
Decimal degrees of longitude.
Reference:
Abbreviated reference, which can be used to look up the full reference in the
file “GeoHeat_GB_References_v0.pdf”.
Temp_C:
Temperature in degrees centigrade.
TDS:
Total dissolved solids, milligrams per liter.
Field_pH:
pH measured in field.
Lab_pH:
pH measured in laboratory.
Conduct:
Conductivity measured in field, in units of
microseimens.
Na:
Sodium, milligrams per liter.
K:
Potassium, milligrams per liter.
Ca:
Calcium, milligrams per liter.
Mg:
Magnesium, milligrams per liter.
Fe:
Iron, milligrams per liter.
Sr:
Strontium, milligrams per liter.
Li:
Lithium, milligrams per liter.
B:
Boron, milligrams per liter.
SiO2:
Silica, milligrams per liter.
HCO3:
Bicarbonate, milligrams per liter.
SO4:
Sulfate, milligrams per liter.
Cl:
Chloride, milligrams per liter.
F:
Fluoride, milligrams per liter.
As:
Arsenic, milligrams per liter.
Calc_TDS:
Calculated total dissolved solids, milligrams per liter.
NO3:
Nitrate, milligrams per liter.
T_Na_K_Ca:
Estimated reservoir temperature in degrees centigrade based on the
sodium-potassium-calcium geothermometer, with a magnesium correction when a
magnesium analysis is available. Values of “-1” indicate that insufficient data
were available to estimate a temperature. Caution should be used in
interpreting geothermometer temperature estimates, which don’t always accurately
estimate reservoir temperatures. Geothermometer calculations are the same as
those employed and documented by Mariner et al., 1983 (Mariner, R.H., Presser,
T.S., and Evans, W.C., 1983, Geochemistry of active geothermal systems in the
northern Basin and Range province: Geothermal Resources Council Special Report
No. 13, p. 95-119.
T_SiO2:
Estimated reservoir temperature in degrees centigrade based on the silica
geothermometer. Values of “-1” indicate that insufficient data were available
to estimate a temperature. Caution should be used in interpreting
geothermometer temperature estimates, which don’t always accurately estimate
reservoir temperatures. Geothermometer calculations are the same as those
employed and documented by Mariner et al., 1983 (Mariner, R.H., Presser, T.S.,
and Evans, W.C., 1983, Geochemistry of active geothermal systems in the northern
Basin and Range province: Geothermal Resources Council Special Report No. 13, p.
95-119.
Ave_Gtemp:
Average of the Na-K-Ca-Mg and the silica geothermometer temperature estimates,
in degrees centigrade.
Chg_Bal:
A charge balance based on the analyses listed in the spreadsheet. The formula
used is: 100 * (cations – anions)/[(cations + anions)/2]. Values of “-999”
indicate insufficient data to calculate a charge balance.
This is an ArcView and
ArcGIS-compatible shapefile of the database. Missing geochemical data are
represented by “-1”. Geochemical data with “less-than” (<) symbols have been
converted to one-half the detection limit value, with the exception of arsenic
data, for which all entrees with “less than” symbols have been converted to “-1”
(no data).
Projection
and Datum:
Lambert,
Central Meridian = -117,
Central
Parallel = 0,
Standard
Parallel 1 = 33,
Standard
Parallel 2 = 45;
False Easting
and False Northing = 0,
Datum = NAD27
Description of columns (fields) in the attribute table of the shape file:
State:
Two-letter abbreviation for state.
Site_ID:
Site identification number or name. Represented as text, not a number,
because some states have alphanumeric codes for this field.
SampleNo:
Sample number. Available only for Arizona.
Date:
Date. Format varies from state to state.
Name:
Site name.
Type:
Type of sample site: CLT = commercial low-temperature; INJ = injection well; M =
mine; NLT = non-commercial low temperature; OIL = petroleum well; S = spring, SP
= spring, SW = well drilled to control spring; TG = temperature gradient well; W
= well; WW = well; X = type not confirmed.
Depth_m:
Depth of well in meters. “-1” values indicate no data.
Flow_lpm:
Flow rate in liters per minute. “-1” values indicate no data.
Latitude:
Decimal degrees of latitude.
Longitude:
Decimal degrees of longitude.
Reference:
Abbreviated reference, which can be used to look up the full reference in the
file “GeoHeat_GB_References_v0.pdf”.
Temp_C:
Temperature in degrees centigrade.
TDS:
Total dissolved solids, milligrams per liter.
Field_pH:
pH measured in field.
Lab_pH:
pH measured in laboratory.
Conduct:
Conductivity measured in field, in units of
microseimens.
Na:
Sodium, milligrams per liter.
K:
Potassium, milligrams per liter.
Ca:
Calcium, milligrams per liter.
Mg:
Magnesium, milligrams per liter.
Fe:
Iron, milligrams per liter.
Sr:
Strontium, milligrams per liter.
Li:
Lithium, milligrams per liter.
B:
Boron, milligrams per liter.
SiO2:
Silica, milligrams per liter.
HCO3:
Bicarbonate, milligrams per liter.
SO4:
Sulfate, milligrams per liter.
Cl:
Chloride, milligrams per liter.
F:
Fluoride, milligrams per liter.
As:
Arsenic, milligrams per liter.
Calc_TDS:
Calculated total dissolved solids, milligrams per liter.
NO3:
Nitrate, milligrams per liter.
T_Na_K_Ca:
Estimated reservoir temperature in degrees centigrade based on the
sodium-potassium-calcium geothermometer, with a magnesium correction when a
magnesium analysis is available. Values of “-1” indicate that insufficient data
were available to estimate a temperature. Caution should be used in
interpreting geothermometer temperature estimates, which don’t always accurately
estimate reservoir temperatures. Geothermometer calculations are the same as
those employed and documented by Mariner et al., 1983 (Mariner, R.H., Presser,
T.S., and Evans, W.C., 1983, Geochemistry of active geothermal systems in the
northern Basin and Range province: Geothermal Resources Council Special Report
No. 13, p. 95-119.
T_SiO2:
Estimated reservoir temperature in degrees centigrade based on the silica
geothermometer. Values of “-1” indicate that insufficient data were available
to estimate a temperature. Caution should be used in interpreting
geothermometer temperature estimates, which don’t always accurately estimate
reservoir temperatures. Geothermometer calculations are the same as those
employed and documented by Mariner et al., 1983 (Mariner, R.H., Presser, T.S.,
and Evans, W.C., 1983, Geochemistry of active geothermal systems in the northern
Basin and Range province: Geothermal Resources Council Special Report No. 13, p.
95-119.
Ave_Gtemp:
Average of the Na-K-Ca-Mg and the silica geothermometer temperature estimates,
in degrees centigrade.
Chg_Bal:
A charge balance based on the analyses listed in the spreadsheet. The formula
used is: 100 * (cations – anions)/[(cations + anions)/2]. Values of “-999”
indicate insufficient data to calculate a charge balance.
The full database can be obtained from the Geo-Heat Center,
Oregon Institute of Technology, 3201 Campus Drive, Klamath Falls, OR. 97601 tel:
(541)885-1750;
geoheat@oit.edu;
http://geoheat.oit.edu.
Acknowledgments for individual state compilations are as
follows:
Arizona:
“Geothermal Resource
Database - Arizona” by James C. Witcher from Southwest Technology Development
Institute, Las Cruces, NM.
California:
“California
Low-Temperature Geothermal Resources Update - 1993" by Les Youngs, Department of
Conservation, Division of Mines and Geology, Sacramento, CA.
Idaho: “Overview of
Geothermal Investigations in Idaho, 1989 to 1993" by William J. Dansart, John D.
Kauffman and Leland L. Mink, University of Idaho, Moscow, ID.
Nevada: “Nevada Low
Temperature Geothermal Resource Assessment: 1994" by Larry J. Garside, Nevada
Bureau of Mines and Geology, University of Nevada, Reno.
Oregon: “Open-File
Report 0-94-9 Low-Temperature Geothermal Database for Oregon” by Gerald Black,
Oregon Department of Geology and Mineral Industries, Portland, OR.
Utah:
“Low-Temperature Geothermal Water in Utah: A Compilation of Data for Thermal
Wells and Springs Through 1993" - Open File Report 311, Utah Geological Survey
by Robert E. Blackett.
Wyoming: The well
and spring information came from the original GEOTHERM database which was
provided by Henry Heasler, University of Wyoming, Special Data and Visualization
Center, Laramie, WY.
This data has been assembled together “as is” into a Great Basin data set. No
further editing for errors has been done beyond that already completed as part
of the original Geo-Heat database construction. Caution should be used in
interpreting geothermometer temperature estimates, which don’t always accurately
estimate reservoir temperatures.
Please contact us if you have questions, comments, or suggestions concerning the
posting and availability of this database. Mark Coolbaugh:
mfc@unr.nevada.edu; tel: (775) 784-1415.