Abstract: The dataset includes subsurface stratigraphic picks for the top of the Oldman Formation (base of the Dinosaur Park Formation) in the Alberta Plains (Townships 1 to 47, Ranges 1W4 to 5W5) made from wireline geophysical well logs. The dataset supplements Alberta Geological Survey Open File Report 2011-13, which describes the methodology used to make the picks. Well data were screened to detect errors resulting from deviated wells, as well as incorrect ground and kelly bushing elevation data. We used statistical methods to identify local and regional statistical outliers, which we examined individually.
Metadata:
File identifier:
DIG_2011_0006.xml
Language:
eng; CAN
Character set:
Character set code:
utf8
Hierarchy level:
Scope code:
dataset
Metadata author:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1918
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
Electronic mail address:
AGS-Info@aer.ca
Hours of service:
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Role:
Role code:
pointOfContact
Date stamp:
2016-03-29
Metadata standard name:
North American Profile of ISO 19115:2003 - Geographic information - Metadata (NAP-Metadata)
Metadata standard version:
ISO 19115-1.1
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Vector spatial representation:
Geometric objects:
Geometric objects:
Geometric object type:
Geometric object type code:
point
Geometric object count:
8799
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Grid spatial representation:
Number of dimensions:
2
Axis Dimension Properties:
Dimension:
Dimension name:
Dimension name type code:
column
Dimension size:
unknown
Resolution:
uom: decimalDegrees
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Axis Dimension Properties:
Dimension:
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row
Dimension size:
unknown
Resolution:
uom: decimalDegrees
8.9831528411952133e-009
Cell geometry:
Cell geometry code:
Transformation parameter availability:
false
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Reference system:
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Reference system:
Reference system identifier:
RS Identifier:
Code:
EPSG:4269
Code Space:
http://www.epsg-registry.org/
Version:
8.4.1
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xlink: https://www.ngdc.noaa.gov/docucomp/65f8b220-95ed-11e0-aa80-0800200c9a66 title: North American Datum 1983
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xlink: https://www.ngdc.noaa.gov/docucomp/c3895520-95ed-11e0-aa80-0800200c9a66 title: Geodetic Reference System 1980
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Data identification:
Citation:
Citation:
Title:
Subsurface Stratigraphic Picks for the Top of the Oldman Formation (Base of Dinosaur Park Formation),
Alberta Plains (tabular data, tab-delimited format, to accompany Open File Report 2011-13)
Date:
Date:
Date:
2011-12-14
Date type:
Date type code:
publication
Cited responsible party:
Responsible party:
Organisation name:
Energy Resources Conservation Board
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Glombick, P.M.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Contact info:
Contact:
Address:
Address:
City:
Edmonton
Administrative area:
Alberta, Canada
Role:
Role code:
publisher
Presentation form:
Presentation form code:
tableDigital
Series:
Series:
Name:
Digital Data
Issue identification:
DIG 2011-0006
Abstract:
The dataset includes subsurface stratigraphic picks for the top of the Oldman Formation (base of the Dinosaur
Park Formation) in the Alberta Plains (Townships 1 to 47, Ranges 1W4 to 5W5) made from wireline geophysical
well logs. The dataset supplements Alberta Geological Survey Open File Report 2011-13, which describes the
methodology used to make the picks. Well data were screened to detect errors resulting from deviated wells,
as well as incorrect ground and kelly bushing elevation data. We used statistical methods to identify local
and regional statistical outliers, which we examined individually.
Purpose:
To provide a set of stratigraphic picks for the top of the Oldman Formation in the Alberta Plains.
Status:
Progress code:
completed
Point of contact:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1918
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
Electronic mail address:
AGS-Info@aer.ca
Hours of service:
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Role:
Role code:
pointOfContact
Resource maintenance:
Maintenance information:
Maintenance and update frequency:
Maintenance frequency code:
notPlanned
Descriptive keywords:
Keywords:
Keyword:
bedrock geology
Keyword:
belly river group
Keyword:
campanian
Keyword:
data
Keyword:
dinosaur park formation
Keyword:
oldman formation
Keyword:
stratigraphic picks
Keyword:
stratigraphy
Keyword:
subsurface mapping
Keyword:
upper cretaceous
Keyword:
well log signature
Type:
Keyword type code:
theme
Thesaurus name:
Citation:
Title:
none
Date:
unknown
Descriptive keywords:
Keywords:
Keyword:
72e
Keyword:
72l
Keyword:
72m
Keyword:
73d
Keyword:
73e
Keyword:
82g
Keyword:
82h
Keyword:
82i
Keyword:
82j
Keyword:
82o
Keyword:
82p
Keyword:
83a
Keyword:
83b
Keyword:
83h
Keyword:
alberta
Keyword:
alberta plains
Keyword:
canada
Type:
Keyword type code:
place
Thesaurus name:
Citation:
Title:
none
Date:
unknown
Resource constraints:
Legal constraints:
Access constraints:
Restriction code:
otherRestrictions
Use constraints:
Restriction code:
otherRestrictions
Other constraints:
Access Constraints: Public Use Constraints: Acknowledgement of the Alberta Energy Regulator/Alberta
Geological Survey as the originator/source of this information is required as described in the Open
Government License - Alberta. Distribution Liability: The Alberta Energy Regulator/Alberta Geological
Survey (AER/AGS) licenses this information under the Open Government License - Alberta. Any references
to proprietary software in our documentation, and/or any use of proprietary data formats in our
releases, do not constitute endorsement by the AER/AGS of any manufacturer's product.
Aggregation Info:
AggregateInformation:
Aggregate Data Set Name:
Citation:
Title:
Subsurface Stratigraphic Picks for the Top of the Oldman Formation (Base of Dinosaur Park Formation),
Alberta Plains
Date:
Date:
Date:
2011-12-14
Date type:
Date type code:
publication
Cited responsible party:
Responsible party:
Organisation name:
Energy Resources Conservation Board
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Glombick, P.M.
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Organisation name:
Alberta Geological Survey
Contact info:
Contact:
Address:
Address:
City:
Edmonton
Administrative area:
Alberta, Canada
Online Resource:
Online Resource:
Linkage:
URL:
http://ags.aer.ca/
Role:
Role code:
publisher
Presentation form:
Presentation form code:
documentDigital
Series:
Series:
Name:
Open File Report
Issue identification:
OFR 2011-13
Other citation details:
ISBN: 978-0-7785-8655-5
Association Type:
Association type code:
crossReference
Spatial representation type:
Spatial representation type code:
vector
Language:
eng; CAN
Topic category:
Topic category code:
geoscientificInformation
Extent:
Extent:
Geographic element:
Geographic bounding box:
West bound longitude:
-114.55041
East bound longitude:
-110.005707
South bound latitude:
47.315355
North bound latitude:
53.226604
Temporal element:
Temporal extent:
Extent:
Time period:
Description:
ground condition
Begin date:
2008-01-01
End date:
2011-01-01
Supplemental Information:
Language: In English;
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Feature catalogue description:
Included with dataset:
false
Feature catalogue citation:
Citation:
Title:
Entity and Attribute Information
Date:
Other citation details:
Detailed Entity and Attribute information is provided with the dataset, formatted as Federal Geographic
Data Committee (FGDC) Content Standard for Digital Geospatial Metadata.
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Distribution:
Distributor:
Distributor:
Distributor contact:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1918
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
Electronic mail address:
AGS-Info@aer.ca
Hours of service:
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Role:
Role code:
distributor
Transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://static.ags.aer.ca/files/document/DIG/DIG_2011_0006.zip
Name:
Tabular Data
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Data quality:
Scope:
Scope:
Hierarchy level:
Scope code:
dataset
Report:
Absolute external positional accuracy:
Name of measure:
Horizontal Positional Accuracy
Measure description:
Evaluation method description:
The latitude and longitude co-ordinates for well surface and bottom-hole locations are from IHS (Petra
software). The horizontal positional accuracy is unknown.
Result:
Quantitative result:
Value unit:
Base unit:
Identifier:
Units system: xlink: http://www.bipm.org/en/si/
Value:
Report:
Absolute external positional accuracy:
Name of measure:
Vertical Positional Accuracy
Measure description:
Evaluation method description:
In vertical wells, the subsurface depth of a pick in a well, measured with respect to metres above sea
level, is calculated by taking the elevation of the kelly bushing (on the drilling platform) and
subtracting the measured depth of the pick on the geophysical well log. Some uncertainty in the vertical
depth of the measured pick will result if the borehole is not entirely vertical. The bottom-hole
latitude and longitude of each well location were compared with the surface latitude and longitude for
each well to ensure they were the same. If either the surface or bottom-hole latitude and longitude are
incorrect, some degree of vertical error may result. In general, the amount of vertical depth due to
deviations from the vertical in boreholes is deemed negligible with respect to other potential sources
of vertical error in this study. Perhaps the greatest source of vertical uncertainty in this study is
potential error in the elevation of the kelly bushing (KB). Any errors in surveying the ground elevation
of the well site can result in vertical error. In addition, once the ground elevation is determined, the
site is usually prepared for the drilling rig. If the original survey marker is disturbed or moved, this
can result in potential vertical errors. The KB elevation is usually derived from adding the height of
the drilling platform above the ground surface to the survey ground elevation. If this is done
incorrectly, it can introduce vertical error in the KB elevation, which is then propagated in the
measured depth to the pick and the subsea pick depth. Although incorrect KB elevation data can be
difficult to detect, the data were screened by comparing the ground elevation and the KB elevation
(derrick height) for each well. An acceptable range of derrick height (calculated by subtracting ground
elevation from KB elevation) of two to six metres was used. Wells with derrick heights outside this
range were excluded. To check for potential gross errors in the ground elevation for wells, ground
elevations were compared with shuttle-radar digital elevation model (DEM) elevations extracted for well
surface locations. If the difference between the ground elevation and the elevation derived from the DEM
data was more than 2 ± 6 metres (i.e., -4 to 8 metres; approximately the mean of this difference plus or
minus two standard deviations for all wells in the Alberta Plains), the data from those wells were
excluded. This method potentially excluded wells for which well ground elevation values are correct, but
for which the DEM data for that well location are incorrect. It also may not have detected relatively
small errors in either ground or KB elevation data for a well, as long as those values met the screening
criteria. However, it did detect large errors in well KB or ground elevation data. Vertical error in the
pick subsea elevation can also result from human or geological error resulting from uncertainty or
incorrect placement of the pick on the well logs. The occurrence and magnitude of this error is
difficult to identify, but comparison with existing published pick datasets and checks for internal
consistency (such as identification of global and local outliers using statistical methods and gridding
data while picking) minimized this source of error.
Result:
Quantitative result:
Value unit:
Base unit:
Identifier:
Units system: xlink: http://www.bipm.org/en/si/
Value:
Report:
Completeness commission:
Result:
unknown
Report:
Completeness omission:
Evaluation method description:
The author used a minimum well density of one well per township (about 100 square km). However, in most
areas, the well density greatly exceeded that number, especially in areas with anomalous structures.
About 800 townships were picked, resulting in an average well density of 11 wells per township.
Result:
unknown
Report:
Conceptual consistency:
Measure description:
The data are tabular (point data with X, Y and Z values). The author generated all stratigraphic picks for
the report. All picks are ranked the same in quality. As the dataset includes only vertical wells, all
location data and well identifier data (UWI and UWI_MODIFIED) are unique. In non-vertical wells, surface
and bottom-hole latitude and longitude may be different, and several wells may share a common surface
location but have different bottom-hole locations. By choosing only vertical wells, we avoided this
problem. The data are from the Alberta Plains where deformation of the Cretaceous sedimentary succession
is relatively minor. All points are east of the deformation front at a given latitude. Thus, rocks
should not be thrusted or structurally duplicated. Therefore, the top of the Oldman should only occur
once in any given vertical well. No data are missing. Attribute values were checked to ensure reasonable
values. For instance, the author plotted the well locations on a map and observed no obvious anomalous
locations. A query checked for any deviations from vertical of the well surface location compared with
the bottom-hole location. These wells were removed from the dataset. If a well is deviated, its surface
and bottom-hole co-ordinates should be different. As all remaining wells should be vertical if the
surface and bottom-hole co-ordinates are correct, measured depth and true vertical depth should be equal.
Result:
unknown
Report:
Non quantitative attribute accuracy:
Measure description:
A stratigraphic pick in a well is a point defined in three dimensions (X, Y and Z).
The accuracy of the pick depth, either in measured depth from the kelly bushing or with respect to sea
level, is difficult to quantify and includes (but is not necessarily limited to) errors in
- well surface or bottom-hole latitude and longitude (X and Y);
- well ground elevation (Z);
- well kelly bushing elevation (Z);
- geological or human error resulting from errors in picking the incorrect stratigraphic top (Z);
- data entry or data transfer (X, Y and/or Z); and
- incorrect well-log depth calibration (Z).
Result:
inapplicable
Lineage:
Lineage:
Statement:
The author used a minimum well density of one well per township (about 100 square km). However, in most
areas, the well density greatly exceeded that number, especially in areas with anomalous structures.
About 800 townships were picked, resulting in an average well density of 11 wells per township.
Process step:
Process step:
Description:
Prior to making picks for a given surface, the author studied the published geological literature with
emphasis on type and/or representative sections. Studies including both core and geophysical well
logs were particularly valuable, as they provided a link between the rock and geophysical signatures.
Geophysical well logs (both digital and raster format) were examined using Petra and AccuMap software,
and picks were recorded in a database. When sufficient well density and log availability permitted,
we selected wells according to the following criteria:
1) vertical wells only;
2) wells with a spud date between 1975 and present; and
3) wells with down-hole, geophysical, well-log suites that included gamma-ray, density or sonic, and
resistivity logs.
The author gave preference to wells with a bottom surface-casing shoe of less than 50 metres deep. If
sufficient well density was unavailable using the above criterion, the criterion was expanded to
include wells with the bottom of surface casing in the 50-150 m range. A minimum well density of one
well per township was used, although, in most areas, well density greatly exceeded that number,
especially if an anomalous structure was detected. The author picked about 800 townships, resulting
in an average well density of 11 wells per township.
Date and time:
2011-01-01T00:00:00
Process step:
Process step:
Description:
To correlate and check internal consistency, we used a series of north-south and east-west
cross-sections, with a spacing of about 10 km (one township), to make picks. Therefore, a pick in a
well was typically compared with three to four picks in nearby wells to ensure consistency. During
picking, picks were gridded using the triangulation method using Petra to identify and check
outliers, which appear as bull's eyes on a structure-contour map.
After making picks, and prior to modelling the surface, steps were taken to detect errors in
- depth data (true vertical depth compared with measured depth data for non-deviated wells);
- kelly bushing (KB) elevation data for wells;
- ground-elevation data for wells; and
- pick depth due to human error.
Picks and well header information, including kelly bushing elevation, ground elevation, surface
location (longitude and latitude in decimal format) and bottom-hole location (longitude and latitude
in decimal format), were exported from Petra (IHS) software into a comma-separated value file. The
datum for the well location is NAD83, and the picks are in metres, given as measured depth relative
to KB elevation. Subsea pick depths were calculated by subtracting measured depth from the KB
elevation.
Date and time:
2011-01-01T00:00:00
Process step:
Process step:
Description:
A query of the well-surface location compared with the bottom-hole location was run to check for any
deviations from vertical. We removed these wells from the dataset. If a well is deviated, its
surface and bottom-hole co-ordinates should be different. As all remaining wells should be vertical
if the surface and bottom-hole co-ordinates are correct, measured depth and true vertical depth
should be equal.
Although incorrect kelly bushing (KB) elevation data can be difficult to detect, the author screened
the data by comparing the ground elevation and the KB elevation (derrick height) for each well. An
acceptable range of derrick height (calculated by subtracting ground elevation from KB elevation) of
two to six metres was used. We excluded wells with derrick heights outside of this range.
To check for potential gross errors in the ground elevation for wells, ground elevations were compared
with shuttle-radar digital elevation model (DEM) elevations extracted for well-surface locations. If
the difference between the ground elevation and the elevation derived from the DEM data was more
than 2 ± 6 metres (i.e., -4 to 8 metres; approximately the mean of this difference plus or minus two
standard deviations for all wells in the Alberta Plains), the data from those wells were excluded.
This method potentially excluded wells for which well ground-elevation values were correct, but for
which the DEM data for that well location were incorrect. It also may not have detected relatively
small errors in either ground or KB elevation data for a well, as long as those values met the
screening criteria. However, it did detect large errors in well KB or ground-elevation data.
Date and time:
2011-01-01T00:00:00
Process step:
Process step:
Description:
Data were then screened for both global and local outliers. Outliers are values outside a specified
normal range compared with the entire dataset (global outliers), or within a local area (local
outliers). If caused by errors, outliers can have several detrimental effects on the interpolated
surface. One should either correct or remove outliers before creating a surface. Outliers may result
from one or more of the following factors:
- incorrect ground elevation and/or kelly bushing-elevation data not detected during the initial
screening;
- incorrect location data for a well;
- deviated wells not marked as such with either incorrect surface or bottom-hole location data;
- incorrect pick data due to human error; and
- geological structure.
We used a variety of geostatistical methods to identify outliers, including examining neighbourhood
statistics, inverse-distance weighting interpolation and Voronoi maps. In addition, the
inverse-distance weighted interpolation method was useful in locating outlier data points, which
appeared as bull's eyes on the resulting map. Outliers were flagged and the well data and
geophysical logs were examined to determine whether the outlier was due to geological structure or
bad data. In cases for which no error could be identified, additional data were gathered to refine
the definition of local structure. In these cases, if the data were a single point and no geological
evidence corroborated the structure, then the data point was removed.
Once outliers were either removed or confirmed, we repeated the outlier screening process three times.
This iterative process identified increasingly more subtle outliers. As each pick was made during
this study and all statistical outliers were examined and some removed, the largest source of error
and uncertainty in the elevation of the Oldman Formation pick is likely to be related to the
surveyed kelly bushing (and ground elevation) for a given well.
Date and time:
2011-01-01T00:00:00
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Legal constraints:
Access constraints:
Restriction code:
otherRestrictions
Use constraints:
Restriction code:
otherRestrictions
Other constraints:
Metadata Access Constraints: none Metadata Use Constraints: none
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Maintenance information:
Maintenance and update frequency:
unknown
Maintenance note:
This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial
Metadatastandard version FGDC-STD-001-1998 using the January 2013 version of the FGDC CSDGM to ISO 19115-2
transform.
Metadata author:
Responsible party:
Organisation name:
Alberta Geological Survey
Position name:
AGS Information Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
(780) 638-4491
Facsimile:
(780) 422-1918
Address:
Address:
Delivery point:
Alberta Energy Regulator
Delivery point:
4th Floor, Twin Atria Building
Delivery point:
4999-98 Avenue NW
City:
Edmonton
Administrative area:
Alberta
Postal code:
T6B 2X3
Country:
Canada
Electronic mail address:
AGS-Info@aer.ca
Hours of service:
8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.
Role:
Role code:
custodian
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