Historical produced water chemistry data compiled for selected oil fields in Los Angeles and Orange Counties, southern California

Dates

Publication Date: 2020-03-30
Start Date: 1933
End Date: 2016

Citation

Metzger, L.F., Morris, D., and Watson, E., 2020, Historical produced water chemistry data compiled for selected oil fields in Los Angeles and Orange Counties, southern California: U.S. Geological Survey data release, https://doi.org/10.5066/P9JXQ3SD.

Summary

This digital dataset contains historical geochemical and other information for 200 samples of produced water from 182 sites in 25 oil fields in Los Angeles and Orange Counties, southern California. Produced water is a term used in the oil industry to describe water that is produced as a byproduct along with the oil and gas. The locations from which these historical samples have been collected include 152 wells. Well depth and (or) perforation depths are available for 114 of these wells. Sample depths are available for two additional wells in lieu of well or perforation depths. Additional sample sites include four storage tanks, and two unidentifiable sample sources. One of the storage tank samples (Dataset ID 57) is associated with [...]

Summary

This digital dataset contains historical geochemical and other information for 200 samples of produced water from 182 sites in 25 oil fields in Los Angeles and Orange Counties, southern California. Produced water is a term used in the oil industry to describe water that is produced as a byproduct along with the oil and gas. The locations from which these historical samples have been collected include 152 wells. Well depth and (or) perforation depths are available for 114 of these wells. Sample depths are available for two additional wells in lieu of well or perforation depths. Additional sample sites include four storage tanks, and two unidentifiable sample sources. One of the storage tank samples (Dataset ID 57) is associated with a single identifiable well. Historical samples from other storage tanks and unidentifiable sample sources may also represent pre- or post-treated composite samples of produced water from single or multiple wells. Historical sample descriptions provide further insight about the site type associated with some of the samples. Twenty-four sites, including 21 wells, are classified as "injectate" based on the sample description combined with the designated well use at the time of sample collection (WD, water disposal or WF, water flood). Historical samples associated with these sites may represent water that originated from sources other than the wells from which they were collected. For example, samples collected from two wells (Dataset IDs 86 and 98) include as part of their description “blended and treated produced water from across the field”. Historical samples described as formation water (45 samples), including 38 wells with a well type designation of OG (oil/gas), are probably produced water, representing a mixture of formation water and water injected for enhanced recovery. A possible exception may be samples collected from OG wells prior to the onset of production. Historical samples from four wells, including three with a sample description of "formation water", were from wells identified as water source wells which access groundwater for use in the production of oil. The numerical water chemistry data were compiled by the U.S. Geological Survey (USGS) from scanned laboratory analysis reports available from the California Geologic Energy Management Division (CalGEM). Sample site characteristics, such as well construction details, were attributed using a combination of information provided with the scanned laboratory analysis reports and well history files from CalGEM Well Finder. The compiled data are divided into two separate data files described as follows: 1) a summary data file identifying each site by name, the site location, basic construction information, and American petroleum Institute (API) number (for wells), the number of chemistry samples, period of record, sample description, and the geologic formation associated with the origin of the sampled water, or intended destination (formation into which water was to intended to be injected for samples labeled as injectate) of the sample; and 2) a data file of geochemistry analyses for selected water-quality indicators, major and minor ions, nutrients, and trace elements, parameter code and (or) method, reporting level, reporting level type, and supplemental notes. A data dictionary was created to describe the geochemistry data file and is provided with this data release.

Contacts

Point of Contact :: Loren F Metzger
Originator :: Loren F Metzger, Devin T Adsit-Morris, Elise Watson
Metadata Contact :: Loren F Metzger
Publisher :: U.S. Geological Survey
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: California Water Science Center
USGS Mission Area :: Water Resources

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Data-Dictionary_UIC_LosAngeles_Orange.xlsx		435.49 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Data-Dictionary_UIC_LosAngeles_Orange_csv.zip		5.01 KB	application/zip
metadata.xml Original FGDC Metadata	View	41.38 KB	application/fgdc+xml
ProdWtr_UIC_LosAngeles_Orange_Geochemistry.csv		119.73 KB	text/csv
ProdWtr_UIC_LosAngeles_Orange_Geochemistry.xlsx		599.29 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
ProdWtr_UIC_LosAngeles_Orange_Sites_Summary.csv		60.05 KB	text/csv
ProdWtr_UIC_LosAngeles_Orange_Sites_Summary.xlsx		494.71 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Purpose

The data were compiled by the USGS California Oil, Gas, and Groundwater (COGG) project as part of the California State Water Resources Control Board’s Regional Monitoring Program of water quality in areas of oil and gas production. The historical data were compiled for forthcoming interpretative reports and publications that will compare historical produced water chemistry data and newly collected groundwater and produced water chemistry data in order to determine potential contrasts and overlap in water chemistry between oil-field water and groundwater at regional scales. These historical data are intended to be used to broadly characterize the range and central tendencies of produced water chemistry in comparison with groundwater from water wells. Because the collection and analysis methods and circumstances under which the historical samples were collected cannot be fully known, the intent is that the historical samples will be used in grouped analysis including many sample results rather than detailed interpretation of each individual sample, which may be affected by unknown sampling and analysis conditions. Caution should be used in basing interpretations of the data on single sample results.

Historical produced water chemistry data compiled for selected oil fields in Los Angeles and Orange Counties, southern California

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