Seismic Upholes
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SARIG Metadata
Citation
Description
Data currency
Dataset status
Access
Data quality
Contact information
Metadata information
Supplementary information
Responsible party
Description
Usage
Dataset associations
Origin
Metadata management
Citation
Unique record ID:
Title: Seismic Uphole
Originator:
Custodian: Petroleum Group - Office of Minerals and Energy Resources, South Australia.
Jurisdiction: South Australia
Description
Abstract:
Seismic 'upholes' are shallow drill holes (20–50m in depth) placed at regular intervals (1–2km) along exploration seismic lines. 'Uphole shooting' allows estimation of the thickness and seismic velocity of the weathered zone as well as the sub-weathering velocity. These data are then used in computing time corrections to a nominal seismic datum, which is a fundamental step in computer processing of seismic field data. Uphole shooting involves successive detonation of a series of charges at varying depths inside the drill hole and recording of the 'uphole time' with a surface geophone placed near the uphole.
The data set contains some 44,000 individual uphole locations recorded over a period from 1975–2002 primarily in the prospective areas of the Cooper-Eromanga, Otway, Pedirka, Arrowie, Arckaringa and Officer basins.
ANZLIC search words:
seismic, geophysics, seismic line, seismic survey, survey, petroleum, hydrocarbon, oil, gas, exploration, geophysics, uphole
Spatial domain:
Geographic extent name: South Australia
Geographic extent polygon: 129 -38.5, 129 -26, 141 -26, 141 -38.5, 129 -38.5
Bounding coordinates:
North Bounding Coordinate: -26
South Bounding Coordinate: -38.5
East Bounding Coordinate: 141
West Bounding Coordinate: 129
Data currency
Beginning date: 01JAN1975
Ending date: 31DEC2002
Dataset status
Progress: In progress
Maintenance and update frequency: As required
Access
Stored data format:
Digital ArcInfo, vector data, geographicals GDA94
Available format type:
Digital ARC/INFO
Digital ArcView Shapefiles
Digital ASCII
Non-Digital Plotted maps
Access constraints:
None
Data quality
Lineage:
Source Data History: PIRSA receives uphole data from exploration companies during submission of all seismic field data according to statutory requirements. The uphole data generally contains a seismic line reference, shotpoint number, coordinate date, a series of time depth pairs, elevation and lithological information. Digital information for some 35,000 locations were received from Santos from their Cooper Basin operations while the remaining points were generally collated from hard copy. All upholes are referred to by their seismic line name and shot point reference. As such, all locations have been linked, tied and validated against the shotpoint data base.
Processing Steps: Location data for all points has been taken from existing shotpoint location data. This applies for both the original Santos data set and any subsequent data. The validation for data integrity is achieved then by ensuring that upholes then plot on their relevant seismic line.
Positional accuracy:
Positional accuracy is ultimately dependent on original seismic line accuracy (see details for seismic lines).
Seismic line accuracy:
The accuracy of the surveyed data is dependant on the survey techniques used to acquire the data and the quality of the horizontal and vertical control to which the seismic shotpoints were connected. The relative accuracy between points, rather than absolute accuracy, is the main criteria in seismic surveying methodology. The absolute accuracy is defined to be within the minimum specifications of (2.5*sqrt(kilometres length of line)) metres for horizontal accuracy and (10*sqrt(kilometres length of line)) centimetres for vertical accuracy. Generally, this accuracy is a factor of 5 times better than the minimum survey specifications. The relative accuracy between points is generally better than a couple of centimetres. The data is stored in the database to 1m precision. The original data is archived in its native format including the original precision which may be quoted to two decimal places.
Attribute accuracy:
Various attribute data aer soruced from original plots, digital files and survey reports. Details are checked by screen preview when entering into PEPS database.
Logical consistency:
Highly consistent
Completeness:
Database is considered to be 100% complete. Updates are performed whenever new data is submitted which is some 3-6 months after survey completion.
Contact information
Contact organisation: Petroleum Group - Office of Minerals and Energy Resources, South Australia.
Contact position: Senior Geophysicist
Postal address: GPO Box 1671
City: Adelaide
State: South Australia
Country: Australia
Postcode: 5001
Telephone: +61 8 8463 3204
Facsimile: +61 8 8463 3229
Electronic mail address: pirsa.petroleum@sa.gov.au
Metadata information
Metadata date: 01AUG2002
Metadata reference:
Supplementary information
Refer to additional user information on our web site.
Responsible party
Responsible: Owner
Description
Dataset classification: Derived
Spatial representation type: Vector
Feature type: Polygon
Dimension: x, y
Sample graphic:
Usage
Purpose:
Use:
Use limitation:
None
Dataset associations
Dependant dataset title:
None.
Attribute information:
Attribute table type: Vector - Line
| Attribute name | SARIG attribute name | Description |
|---|---|---|
| SURVEY | Survey | PIRSA Survey code |
| NAME | Survey name | Survey name |
| DIMENSION | Dimension | Refers to how survey data is collected; either along a line or over an area (one of 2D, 2.5D or 3D) |
| PROVINCE | Province | Sedimentary basin or petroleum province within which the survey is carried out |
| TENEMENT | Tenement | Licensed areas where the survey was carried out |
| REFERENCES | References | PIRSA documents which provide associated survey information |
| OPERATOR | Operator | Company that manages survey operations within the licenced area |
| CONTRACTOR | Contractor | Company that carries out the seismic recording |
| ENERGY_SOU | Energy Sou | Device which releases energy for seismic recording |
| RECMODE | Recmode | Nature of the seismic recording (one of D (Digital) or A (Analog)) |
| INSTRUMENT | Instrument | Seismic recording instrument |
| CHANNELS | Channels | The number of geophone groups which are recorded simultaneously |
| FOLD | Fold | The multiplicity of common-midpoint data |
| LINEKMS | Linekms | Length (km) of all seismic lines which have been recorded for the survey |
| GROUP | Group Inte | The number of geophones in a group that collectively feed a single channel |
| SPVP | Spvp Inter | The distance (m) between geophone groups |
| SECURITY | Security | The status of the seismic survey (one of Open File or Confidential) |
| DATEBEG | Datebeg | The date on which the seismic survey was commenced |
| DATEEND | Dateend | The date on which the seismic survey was completed |
| ONOFF | Situation | Indicates whether the survey is anonshore or offshore survey |
| COMMENT | Comment | Additional comments that clarify survey details |
Origin
Dataset size: 14Mb (ArcView shapefile)
Projection: Geographicals
Datum: Geocentric Datum of Australia (GDA94)
Metadata management
Date modified: 26AUG2002
Modified officer: Hough, Peter
Date authorised: 26AUG2002
Authorisation officer: Hough, Peter
- Page URL: http://www.pir.sa.gov.au/minerals/sarig/metadata/seismic_lines/seismic_upholes
- Page Last Modified: November 8, 2011