Shapefile
Tags
Monterey Formation, acoustic anomaly, active hydrocarbon seep, beach tar, biomarker, carbon isotope, chemometric fingerprint, chemometric model, chirp high-resolution seismic reflection, coastal geology, depositional environment, geologic age, hydrocarbon gas plume, hydrocarbon seep, lithology, multivariate statistics, natural offshore oil seep, natural tar, oil slick, organic geochemistry, passive hydrocarbon seep, petroleum system history, platform oil, production oil, seafloor tar mound, sidescan sonar, tar whip, tarball, water column anomaly, environment, geoscientificInformation, oceans
These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.
Oil spillage from natural sources is very common in the waters of southern California. Active oil extraction and shipping is occurring concurrently within the region and it is of great interest to resource managers to be able to distinguish between natural seepage and anthropogenic oil spillage. The major goal of this study was to establish the geologic setting, sources, and ultimate dispersal of natural oil seeps in the offshore southern Santa Maria Basin and Santa Barbara Basins. Our surveys focused on likely areas of hydrocarbon seepage that are known to occur between Point Arguello and Ventura, California. The USGS collected and analyzed almost 700 samples from the focus area and, for comparison, from other California sites between 1996 and 2007. This metadata file describes the location of samples used in this study and includes a subset of the attributes from Appendix 2-1. Location, classification, and geochemical data for crude oil, seep oil, and tarball samples, and Appendix 3-1 Location, classification, and source/age related geochemical data for crude oil, seep oil, and tarball samples from coastal California, used in the chemometric model with classification of non-model tarballs.
There are no credits for this item.
Not suitable for navigation Read and fully comprehend the metadata prior to data use. Acknowledge the U.S. Geological Survey (USGS), the Originator, when using the data set as a source. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale. This information is not intended for navigational purposes. The data set is NOT a survey document and should not be utilized as such. Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
Extent
| West | -124.289960 | East | -117.280104 |
| North | 40.374210 | South | 32.827345 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Additional information about the field activities from which this data set was derived are available online at > <http://walrus.wr.usgs.gov/infobank/z/z206sc/html/z-2-06-sc.meta.html> > <http://walrus.wr.usgs.gov/infobank/g/g107sc/html/g-1-07-sc.meta.html> > <http://walrus.wr.usgs.gov/infobank/z/z107sc/html/z-1-07-sc.meta.html> > > <http://walrus.wr.usgs.gov/research/projects/oilandgasseep.html#tasks> Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
ground condition
This information is not intended for navigational purposes. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Physical materials are under controlled on-site access. Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
If physical samples or materials are available, constraints on their on-site access are described in "WR CMG Sample Distribution Policy" at URL: http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html
Not suitable for navigation Read and fully comprehend the metadata prior to data use. Acknowledge the U.S. Geological Survey (USGS), the Originator, when using the data set as a source. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale. This information is not intended for navigational purposes. The data set is NOT a survey document and should not be utilized as such. Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
Point features present.
Except for a test blank sample 05-89, all samples included in Appendix 2 of USGS Open-file Report 2009-1225 are included in this shapefile. Sample 05-89 is a laboratory test blank and has no geographic location relevant to the other samples.
Refer to the Open-File Report for information about the accuracy of the identification of the entities and assignments of values in the data set and description of tests used.
Location data were collected by GPS. Nominal accuracy is +/- 5m.
Vertical coordinate measurements were not included in this data set.
The attributes Lab No., Color, Sample Date, Lat. N, Long. W, Type, Type Code, Model Group, and Description from Appendix 2-1 were combined with the attribute Beach_well from Appendix 3-1 and converted to ESRI shapefile for plotting. This shapefile includes the attributes used in plots of the data that appear in this report and does not include the geochemical analytes (d13C, alkanes, etc.), which may be found in the accompanying Appendices 2-1 and 3-1. Date fields are hard-coded as text (mm/dd/yy) because the native Microsoft Excel date numbers differ depending on whether the user is viewing the table in Windows Excel 2003 (date system begins 1900) or Mac Excel 2004 (date system begins 1904).
This 2007 field activity collected field data in the Santa Barbara Channel.
ground condition
This 2007 field activity collected field data in the Coal Oil Point area.
ground condition
This 2006 field activity collected field data in the Santa Barbara Channel.
ground condition
Location and properties of hydrocarbon samples.
This study.
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Feature geometry.
ESRI
Coordinates defining the features.
Sample sequence number.
This study
sorting column from spreadsheet
Laboratory processing number
This study.
sample identification including 2-digit year and sample number
Biodegradation scale.
This study.
<5, >5, >6, na (not applicable to this sample)
Date sample was collected mm/dd/yyyy.
This study.
date
geographic y-coordinate
conventional usage
y-coordinate of sample location in degrees
geographic x-coordinate
conventional usage
x-coordinate of sample location in degrees
Hydrocarbon type of sample from field description.
This study.
description of hydrocarbon type
Classification of hydrocarbon
This study
T- Tarball, S- seep; O- produced oil; M- seep oil slick from unverified location; R- source rock
Chemometric model group - 2 or 3 digit number for which the first digit is the oil tribe - samples that are broadly similar in their geochemical characteristics, but may originate from different source rocks or different organofacies of the same source rock. The second and/or third digits indicate a family - a division of a tribe that consists of geochemically similar samples that originated from the same or very similar source rock.
This study, chapter 3.
Name of sample location, whether beach area, well, or offshore seep
This study
name of sample location
Description of sample from field notes.
This study.
description of sample, location
The shapefile ca_seeps included in this report describes the location of samples used in this study and includes a subset of the attributes from Appendix 2-1. Location, classification, and geochemical data for crude oil, seep oil, and tarball samples, and Appendix 3-1 Location, classification, and source/age related geochemical data for crude oil, seep oil, and tarball samples from coastal California, used in the chemometric model with classification of non-model tarballs. Appendix 2-1 includes 34 chemical fingerprint parameters evaluated for each sample. This group of parameters includes bulk carbon isotope analysis and 33 biomarker ratios or descriptors. A more extensive description is presented in the Open-File Report, in Chapter 2, Biomarker and carbon isotope analysis. Appendix 3-1 includes 19 biomarker and stable isotopic ratios calculated for each sample. A more detailed description is in the Open-File Report, in Chapter 3, Chemometric modeling, tarball sources, and distribution. Records in the appendices and shapefile are related by the item "Sample" or "Lab No."
Lorenson, T.D, Hostettler, F.D., Rosenbauer, R.J., Peters, K.E., Kvenvolden, K.A., Dougherty, J.A., Gutmacher, C.E., Wong, F.L., and Normark, W.R., 2009, Natural offshore seepage and related tarball accumulation on the California coastline; Santa Barbara Channel and the southern Santa Maria Basin; source identification and inventory: U.S. Geological Survey Open-File Report 2009-1225 and MMS report 2009-030, 116 p. and spreadsheets.
Last metadata review date: 2010
Oil spillage from natural sources is very common in the waters of southern California. Active oil extraction and shipping is occurring concurrently within the region and it is of great interest to resource managers to be able to distinguish between natural seepage and anthropogenic oil spillage. The major goal of this study was to establish the geologic setting, sources, and ultimate dispersal of natural oil seeps in the offshore southern Santa Maria Basin and Santa Barbara Basins. Our surveys focused on likely areas of hydrocarbon seepage that are known to occur between Point Arguello and Ventura, California. The USGS collected and analyzed almost 700 samples from the focus area and, for comparison, from other California sites between 1996 and 2007. This metadata file describes the location of samples used in this study and includes a subset of the attributes from Appendix 2-1. Location, classification, and geochemical data for crude oil, seep oil, and tarball samples, and Appendix 3-1 Location, classification, and source/age related geochemical data for crude oil, seep oil, and tarball samples from coastal California, used in the chemometric model with classification of non-model tarballs.
These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.
Additional information about the field activities from
which this data set was derived are available online at
> <http://walrus.wr.usgs.gov/infobank/z/z206sc/html/z-2-06-sc.meta.html>
> <http://walrus.wr.usgs.gov/infobank/g/g107sc/html/g-1-07-sc.meta.html>
> <http://walrus.wr.usgs.gov/infobank/z/z107sc/html/z-1-07-sc.meta.html>
>
> <http://walrus.wr.usgs.gov/research/projects/oilandgasseep.html#tasks>
Any use of trade, product, or firm names is for descriptive purposes
only and does not imply endorsement by the
U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata
file is intended to document the data set in nonproprietary form,
as well as in ArcInfo format, this metadata file may include some
ArcInfo-specific terminology.
ground condition
If physical samples or materials are available, constraints on their on-site access
are described in "WR CMG Sample Distribution Policy" at URL:
http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html
Not suitable for navigation
Read and fully comprehend the metadata prior to data use.
Acknowledge the U.S. Geological Survey (USGS), the Originator, when using the data set
as a source. Any use of trade, firm, or product names is for descriptive purposes only
and does not imply endorsement by the U.S. Government.
Share data products developed using the source data set with the Originator.
Data should not be used beyond the limits of the source scale. This information is
not intended for navigational purposes.
The data set is NOT a survey document and should not be utilized as such. Some USGS
information accessed through this means may be preliminary in nature and presented
without the approval of the Director of the USGS. This information is provided with
the understanding that it is not guaranteed to be correct or complete and conclusions
drawn from such information are the responsibility of the user.
Refer to the Open-File Report for information about the accuracy of
the identification of the entities and assignments of values in the
data set and description of tests used.
Point features present.
Except for a test blank sample 05-89, all samples included in Appendix 2 of USGS Open-file Report 2009-1225 are included in this shapefile. Sample 05-89 is a laboratory test blank and has no geographic location relevant to the other samples.
Location data were collected by GPS. Nominal accuracy is +/- 5m.
Vertical coordinate measurements were not included in this data set.
This 2006 field activity collected field data in the Santa Barbara Channel.
This 2007 field activity collected field data in the Coal Oil Point area.
This 2007 field activity collected field data in the Santa Barbara Channel.
The attributes Lab No., Color, Sample Date, Lat. N, Long. W, Type, Type Code, Model Group, and Description from Appendix 2-1 were combined with the attribute Beach_well from Appendix 3-1 and converted to ESRI shapefile for plotting. This shapefile includes the attributes used in plots of the data that appear in this report and does not include the geochemical analytes (d13C, alkanes, etc.), which may be found in the accompanying Appendices 2-1 and 3-1.
Date fields are hard-coded as text (mm/dd/yy) because the native Microsoft Excel date numbers differ depending on whether the user is viewing the table in Windows Excel 2003 (date system begins 1900) or Mac Excel 2004 (date system begins 1904).
Metadata imported.
The shapefile ca_seeps included in this report
describes the location of samples
used in this study and includes a subset of the
attributes from
Appendix 2-1. Location, classification, and
geochemical data for crude oil, seep oil, and tarball
samples, and
Appendix 3-1 Location, classification, and source/age
related geochemical data for crude oil, seep oil, and
tarball samples from coastal California, used in the
chemometric model with classification of non-model
tarballs.
Appendix 2-1 includes 34 chemical fingerprint parameters
evaluated for each sample.
This group of parameters includes bulk carbon isotope analysis and
33 biomarker ratios or descriptors.
A more extensive description is presented in the Open-File Report,
in Chapter 2, Biomarker and carbon isotope analysis.
Appendix 3-1 includes 19 biomarker and stable isotopic ratios
calculated for each sample.
A more detailed description is in the Open-File Report,
in Chapter 3, Chemometric modeling, tarball sources, and distribution.
Records in the appendices and shapefile are related by the item
"Sample" or "Lab No."
Lorenson, T.D, Hostettler, F.D., Rosenbauer, R.J.,
Peters, K.E., Kvenvolden, K.A., Dougherty, J.A.,
Gutmacher, C.E., Wong, F.L., and Normark, W.R., 2009,
Natural offshore seepage and related tarball
accumulation on the California coastline; Santa
Barbara Channel and the southern Santa Maria Basin;
source identification and inventory: U.S. Geological
Survey Open-File Report 2009-1225 and MMS report
2009-030, 116 p. and spreadsheets.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and
does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended
to document the data set in nonproprietary form, as well as in ArcInfo format,
this metadata file may include some ArcInfo-specific terminology.
Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Physical materials are under controlled on-site access.
Some USGS information accessed through this means may be preliminary in nature and
presented without the approval of the Director of the USGS. This information is
provided with the understanding that it is not guaranteed to be correct or complete
and conclusions drawn from such information are the responsibility of the user.