Depth_K90
Grid depicting the modelled depth, in metres, beneath sea level to the K90 horizon in the Northwest Province mapping area (Taranaki, Deepwater Taranaki, and Reinga-Northland basins), for the Atlas of Petroleum Prospectivity. The grid was generated in Paradigm 2015 SeisEarth software using an adaptive fitting algorithm and a grid resolution of 1 km x 1 km. Faults have not been incorporated into the regional-scale gridding of either the TWT or depth maps in this project. The depth grids were then exported from SeisEarth (Zmap format), checked for internal consistency in Zetaware (Trinity 4.61), edited as needed to account for gridding errors and then exported as ArcView Ascii grids. For more information about the depth conversion and gridding process used, please refer to: Arnot, M.J. and Bland, K.J. et al. (Compilers), 2016. Atlas of Petroleum Prospectivity, Northwest Province: ArcGIS geodatabase and technical report. GNS Science Data Series 23b. Given the considerable variability in the spacing and density of 2D seismic data over the entire NWP area the "smoothness" of the depth maps varies accordingly. In the central Taranaki Basin, where seismic line spacing may be 5 km or less, the 1 km x 1 km grid resolution captures the geological complexity well. However, in areas of the NWP such as the Deepwater Taranaki Basin to the west and Reinga Basin in the north, seismic line spacing may be in the order of 15 to 30 km. In such areas the underlying geological complexity is only captured where seismic interpretation exists along the available 2D seismic lines. It is recognised that whilst the APP NWP seismic mapping was completed at an appropriate resolution for a frontier basin, GNS Science has over the past decade put significant effort into mapping, modelling, and depth conversion in the southern Taranaki Basin region (Bull et al., 2015). In particular, the more sophisticated velocity modelling in the southern Taranaki Basin results in a more robust depth conversion in the areas that have experienced significant uplift and erosion during the Miocene compressional phases. Due to the availability of better resolution depth-converted data in the south, the APP's NWP grids were overwritten with the relevant southern Taranaki Basin mapped intervals to take advantage of this more robust depth conversion. As the cell size of the Bull et al. (2015) grids is finer than the NWP grids, the former were down sampled to 1 km x 1 km cell size to match the NWP gridding. Although the TWT interpretation is constant across the models' boundary, it was found that due to the different depth conversion methods applied there was a marked step in between depth grids. It was decided to leave this footprint artefact to help differentiate between the two modelled areas rather than smoothing the join.
Simple
- Date (Publication)
- 2016-12-14
- Presentation form
- Digital map
- Purpose
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Depth to K90 (in metres, below sea level) in the Northwest Province mapping area.
- Credit
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We acknowledge the many members of the APP and 4D Taranaki project teams, past and present, for their interpretations, comments, and inputs into developing these data. Previous GNS Science TWT mapping of the NWP has been incorporated into these data. This includes interpretation and reports by: Uruski et al. (2002, 2004, 2008); Stagpoole et al. (2009); Bland et al. (2014); GNS Science and NIWA (2014); and Bull et al. (2015). GNS Science thanks Paradigm Ltd, for use of seismic interpretation software (SeisEarth), and geological modelling software (SKUA-GOCAD), and Zetaware.com for use of Trinity software for grid QC. GNS Science also thanks the many companies that over many years have provided seismic data for use in research programmes such as APP, and also to the open-file petroleum data system administered by New Zealand Petroleum and Minerals. <br/><br/>This work programme is funded by the New Zealand Government, through the Ministry of Business, Innovation and Employment's (MBIE) Energy and Minerals targeted research fund. Contract C05X1406 to GNS Science. This work is also supported by the Petroleum Basins Research (PBR) and EEZ programmes via Direct Crown Funding from the New Zealand Government (MBIE). Compilation of these data was led by Dr Hannu Seebeck ( h.seebeck@gns.cri.nz ; seismic mapping) and Mr Paul Viskovic ( p.viskovic@gns.cri.nz ; gridding and depth conversion).
- Point of contact
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Organisation name Individual name Electronic mail address Role GNS Science
Dr Kyle Bland
Point of contact
- Maintenance and update frequency
- As needed
- Use limitation
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Any use of these data should acknowledge GNS Science's Atlas of Petroleum Prospectivity programme. GNS Science has made all reasonable endeavours to ensure the accuracy and completeness of the product but gives no warranties and makes no representations (express or implied) as to its accuracy, completeness or fitness for purpose, or title. GNS Science accepts no liability on account of errors in any of the information and each user must rely on its own inquiries. GNS Science excludes liability for any loss, damage or expense, direct or indirect and however caused, whether through negligence or otherwise resulting from any person, company or organisation's use of, or reliance on, these data. In no circumstances will GNS Science be liable for consequential, indirect, special or punitive damages. Use of the product will be deemed to be acceptance of these terms.
- Spatial representation type
- Grid
- Language
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eng
- Topic category
-
- Geoscientific information
- Environment description
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Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959
))
- Reference system identifier
- EPSG / 2193
- Distribution format
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Name Version File Geodatabase Raster Dataset
10.3.3
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://data.gns.cri.nz/webmaps/petroleum/wms gns:NWP_Depth_to_K90__c__75_Ma_
Metadata
- File identifier
- 0B6FA8FF-F66F-44D2-B53F-FC50933393B2 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2024-06-20T02:01:21.310609Z
- Metadata standard version
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1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role GNS Science
Dr Kyle Bland
Point of contact
