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Metadata: 2011, Reynolds International, Zone 9 Celtic Array, Seismic Data Processing
Abstract:
Reynolds International Ltd (RIL) has been appointed by Dr Sophia Fannon-Howell of Centrica Renewable Energy Ltd (CREL; the Client) to provide geophysical processing of single-channel marine seismic data acquired for the Irish Sea Zone. As defined by the Client, the seismic dataset comprises 1003 lines, of which 537 are in IEEE format and 466 are in IBM format. A significant number of the IEEE lines have data saved to two channels. The raw data quality ranges from ‘good’ to ‘not interpretable’. Some lines do not contain navigation information in their headers, with these navigation data being supplied in separate navigation files. A bathymetry data archive consisting of x,y,z text files and PosMV data was also supplied. Initial investigation of the dataset, prior to the work in this report being commissioned, revealed that the two-channel IEEE data contains one ‘strong’ channel containing primary seismic data, and one ‘weak’ channel with near-zero amplitudes. The main aims of the processing were to: 1. Split the dual-channel data to single-channel data files containing the ‘strong’ channel only. 2. Improve the interpretability of the data through seismic processing. 3. Edit the SEG Y files such that they contain correct navigation data. Secondary aims were to: 1. Convert the x,y,z bathymetry data to grid format files readable by the KINGDOM seismic interpretation software. 2. Create auxiliary navigation files to ensure no loss of resolution in SEG Y file navigation data when processed SEG Y files are loaded into KINGDOM. Within this series, the processing report and two addendums are provided, as well as the seismic and bathymetric datasets.
Data holder:
Centrica Energy Renewable Investments (CERI)
Use constraints:
Distribution by Centrica Energy Renewable Investments Limited (CERI) Ltd on a case by case basis
| Other details | ||
| Internal code | Internally assigned metadata identifier | 4776 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2011, Reynolds International, Zone 9 Celtic Array, Seismic Data Processing |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | 5e7f738b-0cfc-4f0e-a7fa-cd35417a3d8d |
| Resource Identifier | This is the code assigned by the data owner. | CERIR32012REYNOLDSSEISMIC |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | series |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2011-03-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2011-12-12 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 3700 |
| Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/uom/gmxUom.xml#m |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | unknown |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Reynolds International Ltd (RIL) has been appointed by Dr Sophia Fannon-Howell of Centrica Renewable Energy Ltd (CREL; the Client) to provide geophysical processing of single-channel marine seismic data acquired for the Irish Sea Zone. As defined by the Client, the seismic dataset comprises 1003 lines, of which 537 are in IEEE format and 466 are in IBM format. A significant number of the IEEE lines have data saved to two channels. The raw data quality ranges from ‘good’ to ‘not interpretable’. Some lines do not contain navigation information in their headers, with these navigation data being supplied in separate navigation files. A bathymetry data archive consisting of x,y,z text files and PosMV data was also supplied. Initial investigation of the dataset, prior to the work in this report being commissioned, revealed that the two-channel IEEE data contains one ‘strong’ channel containing primary seismic data, and one ‘weak’ channel with near-zero amplitudes. The main aims of the processing were to: 1. Split the dual-channel data to single-channel data files containing the ‘strong’ channel only. 2. Improve the interpretability of the data through seismic processing. 3. Edit the SEG Y files such that they contain correct navigation data. Secondary aims were to: 1. Convert the x,y,z bathymetry data to grid format files readable by the KINGDOM seismic interpretation software. 2. Create auxiliary navigation files to ensure no loss of resolution in SEG Y file navigation data when processed SEG Y files are loaded into KINGDOM. Within this series, the processing report and two addendums are provided, as well as the seismic and bathymetric datasets. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Seismic Processing Summary: 1. Files were renamed, where necessary, in order to reduce file name length to avoid file path length limitations during processing 2., Every SEG Y file was loaded into the file splitting software and inspected by eye to identify (a) if the data were single- or dual-channel and (b) the ‘strong’ data channel. The strong data channel was extracted from all dual-channel data files and saved with the file name suffix ‘0’ if channel 0 contained the strong data, or ‘1’ if channel 1 contained the strong data. 3. As part of the file splitting process, each output file was converted to 32-bit standard-format SEG-Y. 4. Files matching the following criteria were deleted: ? Less than ten traces. ? No navigation in the header and no external navigation file. ? The line is a duplicate of another line. 5. Each split line was inspected visually to classify it by data quality, where the primary concern was the degree of processing required rather than interpretability 6. During quality categorisation, several lines were noted to contain reverse polarity data. To maintain consistency throughout the data volume, the trace amplitudes in the reverse polarity lines were reversed. 7. The first two traces of each line were deleted in order to prevent potential interpolation of interface picks across large gaps during later interpretation. 8. Gain to compensate for spherical divergence was applied prior to bandpass filtering. 9. Bandpass filters applied where required 10. A trace amplitude equalisation filter was applied to all lines in order to improve reflector continuity both along and between lines. Batheymetry Processing Summary: 1.The 2x2 m text grid files were concatenated for each area, then converted to points. The points were then converted to ESRI grids (without applying interpolation). 2. The area grids areas for A, B, C, D, E and F only were then combined to form a single project area bathymetry grid, again taking the mean of overlapping grid cells. All area grids were then converted to KINGDOM-compatible uncompressed *.gxf files 3. The 1x1 m text grid files were processed up to ESRI grids. 4. As part of RIL’s data quality checks, the bathymetry data were converted to time using an arbitrary value of 1,490 m/s for the average speed of sound in the water column. Further information is available in report: R3-D-EN-078-0000-000000-017 |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Seismic refraction |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Seismic reflection | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bathymetry and Elevation | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Consenting | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zone search area | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| Keyword title | MEDIN | |
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
| Keyword title | MEDIN | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.9755 |
| East | The eastern-most limit of the data resource in decimal degrees | -3.6694 |
| South | The southern-most limit of the data resource in decimal degrees | 53.4913 |
| West | The western-most limit of the data resource in decimal degrees | -5.0537 |
| Regional sea | atmosphere | |
| water_column | ||
| Irish Sea | ||
| 36E5 | ||
| Irish Sea and St. George's Channel | ||
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Centrica Energy Renewable Investments (CERI) | |
| Position name | GIS and Data Manager | |
| Delivery point | Millstream East, First Floor | |
| Postal code | SL4 5GD | |
| City | Windsor | |
| Country | United Kingdom | |
| CERI@centrica.com | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Centrica Energy Renewable Investments (CERI) | |
| Position name | GIS and Data Manager | |
| Delivery point | Millstream East, First Floor | |
| Postal code | SL4 5GD | |
| City | Windsor | |
| Country | United Kingdom | |
| CERI@centrica.com | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Reynolds International Limited | |
| Delivery point | Reynolds International Limited, Unit 17, Mold Business Park, Wrexham Road | |
| Postal code | CH17 1XP | |
| City | Mold | |
| Administrative area | Flintshire | |
| Country | United Kingdom | |
| info@reynolds-international.co.uk | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/2655/summary |
| Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
| Dataset constraints | ||
| 20 Limitations on Public Access - Access constraints | otherRestrictions | |
| 20 Limitations on Public Access - Other constraints | This states any limitations on access to the data and uses free text. | Distribution by Centrica Energy Renewable Investments Limited (CERI) Ltd on a case by case basis |
| 21 Conditions for Access and Use - Use limitation | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | Distribution by Centrica Energy Renewable Investments Limited (CERI) Ltd on a case by case basis |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | GXF |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2012-09-20 |
| Date of creation | The date that the resource was created. | 2011-12-12 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2014-01-09 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery metadata standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3.7 |