Historical produced water chemistry data compiled for the San Ardo Oil Field and vicinity, Monterey County, central California

Dates

Start Date: 1948
End Date: 2016
Publication Date: 2021-03-31

Citation

Metzger, L.F., 2021, Historical groundwater and produced water chemistry data compiled for the San Ardo Oil Field and vicinity, Monterey County, central California: U.S. Geological Survey data release, https://doi.org/10.5066/P9W6KHK2.

Summary

This digital dataset contains historical geochemical and other information for 271 samples of produced water from 143 sites in or near the San Ardo Oil Field in Monterey County, central California. Produced water is a term used in the oil industry to describe water that is produced from oil wells as a byproduct along with the oil and gas. The locations from which these historical samples have been collected include 101 wells; three wells (DataSet_ID 118 ,125, and 130) are located outside of the administrative boundary, but closer to San Ardo (within 3 miles) than any other oil field, and therefore they were included in this dataset. Well depth and (or) perforation depths are available for 91 of these wells. Sample depths are available [...]

Summary

This digital dataset contains historical geochemical and other information for 271 samples of produced water from 143 sites in or near the San Ardo Oil Field in Monterey County, central California. Produced water is a term used in the oil industry to describe water that is produced from oil wells as a byproduct along with the oil and gas. The locations from which these historical samples have been collected include 101 wells; three wells (DataSet_ID 118 ,125, and 130) are located outside of the administrative boundary, but closer to San Ardo (within 3 miles) than any other oil field, and therefore they were included in this dataset. Well depth and (or) perforation depths are available for 91 of these wells. Sample depths are available for six additional wells in lieu of well or perforation depths. Additional sample sites include 11 storage tanks, and 31 unidentifiable sample sources. Designated well use and sample descriptions provide further insight about what the samples represent. The well use designation of most of the wells (79) is OG (oil/gas) and the samples (188) associated with these wells represent produced water. Samples from two wells (Dataset ID 28 and 130) are described as formation water. One well (Dataset ID 30) was drilled as a water-source well (WS) and used to supply groundwater in support of oil production at the time it was sampled, but later converted to an injection well. Another well (Dataset ID 103) was originally drilled as an oil well, but later abandoned and converted to an irrigation well prior to sampling. Eighteen wells have a site type designation of "injectate" based on the sample description combined with the designated well use at the time of sample collection (SF, steam flood, WD, water disposal, or WF, water flood). Most of the historical samples associated with injectate sites may represent water that originated from sources other than the wells at which they were collected. However, samples from two of these wells (Dataset ID 16 and 76) likely represent produced water as they were sampled prior to the wells being used for injection. Limited information is available about historical samples from storage tanks and unidentifiable sample sources, but these may represent pre- or post-treated composite samples of produced water from single or multiple wells. 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

Project Chief :: Matthew K Landon
Point of Contact :: Loren F Metzger
Originator :: Loren F Metzger
Publisher :: U.S. Geological Survey
Metadata Contact :: Loren F Metzger
Distributor :: U.S. Geological Survey - ScienceBase

Attached Files

Click on title to download individual files attached to this item.

SanArdo_PW_metadata.xml Original FGDC Metadata	View	49.89 KB	application/fgdc+xml
SanArdo_PW_Summary_Data.xlsx		445.3 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
SanArdo_PW_Summary_Data.csv		29.27 KB	text/csv
SanArdo_PW_Geochemistry.xlsx		741.46 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
SanArdo_PW_Geochemistry.csv		132.3 KB	text/csv
SanArdo_PW_Data-Dictionary.xlsx		435.3 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
SanArdo_PW_Data-Dictionary.zip		5.44 KB	application/zip

Purpose

The data were compiled by the USGS California Oil, Gas, and Groundwater (COGG) project as part of the California State Water Resources Control Boards Oil and Gas Regional Monitoring Program. The historical data were compiled to determine potential contrasts and overlap in water chemistry between water from oil-bearing formations 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 the San Ardo Oil Field and vicinity, Monterey County, central California

Dates

Citation

Summary

Summary

Contacts

Attached Files

Purpose

Map

Spatial Services

Communities

Tags

Provenance

Item Actions

View Item as ...

Save Item as ...

View Item...