Depth-migrated High Resolution seismic reflection profiles and interval velocity models in the western Black Sea

This seismic data set was recorded in September 2015 on board the R/V Pourquoi Pas? during the GHASS cruise (IFREMER) on the western Black Sea, offshore Romania. The available profiles (part of the collected data) within this deposit are located on the continental slope, bathymetry between 500 to 1200 meters.

The pre-processing of the seismic data included common midpoint binning @6.25 meters, trace and shot edition, source delay correction, and a 35-375 Hz band pass filtering. Detailed Root Mean Square Velocity analyses were performed on semblance panels computed using super gathers every 150 m. Normal Move Out time correction was then applied on the Common Mid Point (CMP) using these velocities prior to stack. Interval velocities were computed using the Dix equation. The velocity model was then interpolated every CMP location, converted to depth and smoothed to perform post-stack depth migration.

The depth migrated sections and the depth velocity models have been output to standard SEG-Y rev1 format (https://library.seg.org/pb-assets/technical-standards/seg_y_rev1-1686080991247.pdf) with values written using “big-endian” byte ordering and IEEE floating-point. For a given profile, both SEGY files have the same number of traces and the same bin locations. Velocity unit is in meter.second-1. The depth sampling is set to 0.5 meter for both files. The recording delay is zero for the depth migration SEGY files. The delay is coded in meters and constant for a given depth velocity SEGY file, stored within the Trace Header (bytes 109-110). Trace coordinates are also stored within the Trace Header using WGS84 +DDDMMSS.ss format with a scale factor of -100 (bytes 81-88, which means that the value has to divided by 100) . For more convenient access to the location of the profiles, these coordinates are also stored into ASCII files using decimal degrees.

 
Citation proposal
THOMAS Yannick (IFREMER-Brest, UMR GEO-OCEAN 6538, ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané, France) - MARSSET Bruno (IFREMER-Brest, UMR GEO-OCEAN 6538, ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané, France) - DUPONT Pauline (IFREMER-Brest, UMR GEO-OCEAN 6538, ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané, France) - KER Stephan (IFREMER-Brest, UMR GEO-OCEAN 6538, ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané, France) - RIBOULOT Vincent (IFREMER-Brest, UMR GEO-OCEAN 6538, ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané, France) (2023) . Depth-migrated High Resolution seismic reflection profiles and interval velocity models in the western Black Sea. https://services.mspdata.eu:/geonetwork/srv/api/records/seanoe:96701

Simple

Date ( Publication )
2023-10-05
Date ( Revision )
2024-06-06
Other citation details
Thomas Yannick, Marsset Bruno, Dupont Pauline, Ker Stephan, Riboulot Vincent (2023). Depth-migrated High Resolution seismic reflection profiles and interval velocity models in the western Black Sea. SEANOE. https://doi.org/10.17882/96701
Credit
We thank the captain and crews of the R/V Pourquoi Pas? for the 2015 GHASS cruise. The electronic and mechanic staff of GENAVIR in charge of the seismic equipment were critical to the data acquisition. The authors are also grateful to the geoscientists of the National Institute for Research and Development on Marine Geology and Geo-ecology (GeoEcoMar) from Romania for their collaboration to the GHASS project, their participation to the GHASS cruise and for their precious assistance to obtain authorization to acquire data in the Romanian sector of the Black Sea.

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Keywords ( Theme )
  • Seismic reflection , depth migration , velocity model , Marine geology
SeaDataNet Parameter Disciplines ( parameter )
  • Marine geology
Use constraints
Other restrictions
Other constraints
Date ( Publication )
2024

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Association Type
Cross reference
Initiative Type
Study
Association Type
Cross reference
Initiative Type
Platform
Metadata language
English
Topic category
  • Oceans
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W


Distribution format
  • SEGY ( )

  • ASC ( )

OnLine resource
Processed data  

Depth-migrated seismic reflection profile GAS30d [RESTRICTED] - 52 MB

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Velocity model of profile GAS30d [RESTRICTED] - 29 MB

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Location of profile GAS30d traces - 110 KB

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Depth-migrated seismic reflection profile GAS31a [RESTRICTED] - 56 MB

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Velocity model of profile GAS31a [RESTRICTED] - 30 MB

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Location of profile GAS31a traces - 160 KB

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Depth-migrated seismic reflection profile GAS33c - 27 MB

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Velocity model of profile GAS33c - 15 MB

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Location of profile GAS33c traces - 76 KB

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Depth-migrated seismic reflection profile GAS34a [RESTRICTED] - 28 MB

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Velocity model of profile GAS34a [RESTRICTED] - 15 MB

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Location of profile GAS34a traces - 80 KB

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Depth-migrated seismic reflection profile GAS34b [RESTRICTED] - 44 MB

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Velocity model of profile GAS34b [RESTRICTED] - 17 MB

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Location of profile GAS34b traces - 126 KB

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Depth-migrated seismic reflection profile GAS36a [RESTRICTED] - 56 MB

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Velocity model of profile GAS36a [RESTRICTED] - 35 MB

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Location of profile GAS36a traces - 161 KB

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Depth-migrated seismic reflection profile GAS41 [RESTRICTED] - 27 MB

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Velocity model of profile GAS41 [RESTRICTED] - 14 MB

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Location of profile GAS41 traces - 78 KB

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DOI of the product  
OnLine resource
Seanoe  
Hierarchy level
Dataset
Statement

High Resolution seismic equipment (https://archimer.ifremer.fr/doc/00283/39469/)

These High Resolution seismic data were recorded using the SEAL428 equipment and a solid streamer form SERCEL. The streamer had 96 traces with a 6.25 m spacing. The seismic source carried mini-GI air guns, with a total volume ranging from 13 to 48 cubic inch depending on the water depth, supplied by 2000 psi air pressure. The depth of the source was set to 1.5 m and the depth of the streamer to 2 m in order to preserve the high frequency content of the signal: central frequency ranging from 110 to 150 Hz depending on the mini-GI configuration. The distance between source and traces ranges from 50 to 650 meters

Metadata

File identifier
seanoe:96701   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2024-06-06
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0

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  Overviews

High Resolution seismic data from the GHASS cruise (N/O Pourquoi Pas?, 2015, Ifremer) - Location of the depth migrated sections - (X,Y) UTM 36 T coordinates - Bathymetry from the GHASS cruise (Ifremer Geo-Ocean - ANTIPOD)

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