Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program) - Processed sub bottom profiler data

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

[back to top]

Dataset citation

ANZLIC unique identifier: ANZCW0703016778

Title: Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program) - Processed sub bottom profiler data

[back to top]

Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

[back to top]

The survey was undertaken as a collaboration between Geoscience Australia and the Australian Institute of Marine Science (AIMS). The purpose was to acquire geophysical and biophysical data on shallow (less than 100 m water depth) seabed environments within two targeted areas in the Petrel Sub-basin to support investigation for CO2 storage potential in these areas.

Sub bottom profiler data were acquired using a sparker source and a 24 channel streamer, and processed as shallow, high resolution, multi-channel seismic reflection data.

ANZLIC search words:

MARINE Surveys
MARINE Geology and Geophysics

Spatial domain:

locality map

Geographic extent name: JOSEPH BONAPARTE GULF - JOSEPH BONAPARTE GULF - Ocean and Sea Regions - Australia

Geographic extent polygon: 128.75 -12.25, 129.5 -12.25, 129.5 -13, 128.75 -13, 128.75 -12.25,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:: North bounding latitude: -12.25 °; South bounding latitude: -13 °; East bounding longitude: 129.5 °; West bounding longitude: 128.75 °

[back to top]

Data currency

Beginning date: 2012-05-03

Ending date: 2012-05-31

[back to top]

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

[back to top]

Access

Stored data format:: DIGITAL - seg y Seismic digital data - SEG Y format WGS84

Available format type:: DIGITAL - seg y Seismic digital data - SEG Y format WGS84

Access constraints:

This material is released under the Creative Commons Attribution 3.0

Free Data Download

[back to top]

Data quality

Lineage:

Acquisition and processing of the sub bottom profiler data is summarised in the 40 card EBCDIC reel header in each SEG-Y file, according to the SEG-Y standard, and reproduced below for line GA0335_007.

C1 FINAL SUB-BOTTOM PROFILER DATA PROCESSED BY GEOSCIENCE AUSTRALIA AUGUST 2012

C2 DATA ACQUIRED BY GEOSCIENCE AUSTRALIA ON AIMS RESEARCH VESSEL SOLANDER

C3 SURVEY NO. : GA0335 SURVEY NAME : PETREL SUB BASIN MARINE

C4 LINE NO. : GA0335_007 GPS HEADING : 235 DEGREES

C5 RECORDING PARAMETERS

C6 SYSTEM : GEOMETRICS MARINE DATE RECORDED : MAY 2012

C7 RECORDING GAIN: CHAN 1-16 0 dB, CHAN 17-24 12 dB

C8 RECORDING FILTERS : LOW-CUT 0 HZ, HIGH-CUT 0 HZ, NOTCH OUT

C9 SAMPLE RATE : 0.25 MS RECORD LENGTH : 0.5 s

C10 NO. CHANNELS : 24 DATA FORMAT : SEGY Revision 0 ON DISK

C11 SOURCE TYPE : SQUID 2000 SPARKER, CSP-D GENERATOR AT 2000 JOULES (Hi 10)

C12 SOURCE OFFSET : 10 M PERPENDICULAR SOURCE LAYBACK : 20 M

C13 SOURCE DEPTH : 0.5 M (APPROX) SP INTERVAL : 6.25 M

C14 CABLE MODEL : GEOMETRICS GEOEEL GROUP INTERVAL : 3.125 M

C15 CABLE LAYBACK : 40 M CABLE DEPTH : 2.5 M (APPROX)

C16 NEAR CHANNEL : 1 (APPROX 22 M) FAR CHANNEL : 24 (APPROX 92 M)

C17 CMP SPACING : 1.5625 METRES COVERAGE : 6 FOLD

C18 FINAL PROCESSING SEQUENCE : MIGRATION 0.5 s, 0.25 ms

C19 1: dummy line geom (CDP int 1.5625 m)

C20 2: segy to 'disco' internal format

C21 3: mute of leaked timing pulse and first arrivals

C22 4: band pass filter 160/24 to 1500/72 (Hz/dB per octave)

C23 5: whole trace amplitude balance

C24 6: surface related multiple elimination

C25 7: common midpoint sort

C26 8: NMO correction (10% stretch mute), with calculated velocity function

C27 9: non surface consistent trim statics using 20 ms gate around water bottom

C28 10: AGC (50 ms gate)

C29 11: common mid point stack

C30 12: minimum entropy deconvolution

C31 13: finite difference time migration using 100% stacking velocity function

C32 14: band pass filter 160/24 to 1500/72 (Hz/dB per octave)

C33 15: tailored water bottom mute (bytes 111-112)

C34 16: application static for S & R depth and tide relative to MSL

C35 17: trace amplitude scaling and SEG-Y (Revision 1) output

C36

C37 Tides from interpolated GPS elevations from CNAV (M Sexton R Parums)

C38 CDP coordinates in separate P190 file (M Sexton)

C39 GEOPHYSICIST LEONIE JONES; COPYRIGHT COMMONWEALTH OF AUSTRALIA (GEOSCIENCE

C40 AUSTRALIA) 2012, CREATIVE COMMONS ATTRIBUTE 3.0 AUSTRALIA LICENCE

Positional accuracy:

Inherited from raw data in which the C-NAV system was used to provide geographical position with a manufacturer accuracy of 10 cm RMS. However this is the accuracy of the position of the GPS antenna. The movement of the sparker source and the Geoeel streamer in the ocean swell would limit the accuracy of the CDP position of the processed data to approximately 1 m.

Attribute accuracy:

Each shot record was visually examined for quality. The results of each processing step were visually inspected. The final seismic sections have a vertical resolution of better than 1 m.

Logical Consistency:

Best practice seismic processing techniques were used to improve signal to noise. The same processing stream was used for each of the 51 sub bottom profiler lines, ensured by scripting processing jobs from the same templates.

Completeness:

All of the sub bottom profiler data acquired during this survey were processed and output as SEG-Y files, with the exception of bad data at the start and end of lines where the vessel was turning on or off the line.

[back to top]