Modern marine geoscience requires accurate and detailed subsurface information for the mapping of geologic structures and sedimentary sequences beneath the continental margin.
In order to acquire this information NIWA purchased a Multi Channel Seismic system (MCS) in December 1996, consisting of a 24 channel streamer, seismic source and acquisition hardware.
Since then the MCS system has evolved to meet the tight specifications that NIWA science and industry have demanded. Improvements include provision for real-time streamer depth control, better data quality control, greater data acquisition capability (increased to 48 channels), extended streamer length and improved logging facilities. With this substantial investment in hardware and software, NIWA now has the potential to acquire shallow penetration seismic data of excellent quality.
The MCS system has been successfully deployed in numerous scientific voyages and commercial contracts.
Specifications
Array
Manufacturer | Geometrics Inc. |
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Type | Geoeel 42mm Digital Streamer |
Specifications | 48 channel 12.5m group spacing 16 hydrophones (Benthos Geopoint)/ group Group Sensitivity 20v / bar 30m deck cable 200m lead in 2 x 25m elastic section 7 x 100m active sections |
Total Length | 825m |
A/D Converters | 5 – 8000hz bandwidth 24 bit A/D 120db dynamic range 0.0625 – 4ms sample rate |
QC Checks | Hydrophone Capacitance and leakage, Pulse, Oscillator, timing and DC Offset |
Recorder
Manufacturer | Geometrics Inc. |
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Type | CNT-1 |
Specifications | Pentium IV Windows XP Operating system 2 x 20 Gbyte external DLT drive |
QC Displays | Log, Shot, Spectra, Noise, Gather, Trigger, Tape. |
Output | SCSI upto 4 Tape drives Real time gather (selected streamer channel) |
Data Cycle time | < 1 second for 5 second record |
Data Format | SEG2, SEG Y, SEG D |
Energy Source
Manufacturer | Seismic Systems Inc. |
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Type | GI Gun 210 cu.in. |
Specifications | 105 / 150 / 250 cu.in. Generator 105 cu.in. Injector |
Configurations |
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Compressors
Manufacturer | Compair Ltd. |
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Type | Reavell 5436 |
Specifications | 128 cu.m /hr Electric motor, water cooled housed in 10ft shipping container |
Manufacturer | Price |
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Type | SA35-AC |
Specifications | 272 cu.m /hr @ 25°C Electric motor, water cooled housed in 20ft shipping container |
Streamer Depth Control
Manufacturer | Digicourse |
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Type | 7 x 5010 depth birds 3 x 5011 compass birds Model 272 control Unit System 3 control system |