Source and receiver comparisons from Priddis and Hussar
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Source and receiver comparisons from Priddis and Hussar
Source and receiver comparisons from Priddis and Hussar. Malcolm B. Bertram,
J. Helen Isaac, Kevin W. Hall, Kevin L. Bertram and. Gary F. Margrave y g.
Source and receiver comparisons from Priddis and Hussar Malcolm B. Bertram, J. Helen Isaac, Kevin W. Hall, Kevin L. Bertram and Garyy F. Margrave g
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The Priddis survey •Date: •Sources comparison: •Geophone comparison: p p •Recording system:
7-10 December 2010 onSEIS and EnviroVibe Sensor SM24,, RTC4.5,, Oyo-Geospace GS-One y p U of C Aries SPMLite
Priddis source comparison:
EnviroVibe Hold down: 15,000 lb Sweeps per vibe point: point 4 Length of sweep: 20 seconds Sweep: Linear 10-200 Hz Shot spacing: 10m
onSEIS Dual electro-magnetic impact units Impacts per shot point point: 16 Shot spacing: 10m
Industrial Vehicles International, Inc
Yeniseigeofizika OJSC
Shot gathers at flag 110 (SM-24 geophones @ 2.5m)
EnviroVibe
onSEIS
Shot gathers at flag 110 (SM-24 geophones @ 2.5m)
EnviroVibe
onSEIS Filters: 20-25-60-80
The event at 1 second
EnviroVibe
onSEIS
Spectra of the gathers
Shot gathers at flag 180 (SM-24 geophones @ 2.5m)
EnviroVibe
onSEIS
Shot gathers at flag 180 (SM-24 geophones @ 2.5m)
EnviroVibe
onSEIS
Filters: 20-25-60-80
Shot gathers at flag 180 (SM-24 geophones @ 2.5m)
EnviroVibe
onSEIS
First second of gathers with filters: 45-70-250-250
Stacked section with no filter applied
EnviroVibe
onSEIS
Stacked section with time variant filter applied
EnviroVibe
onSEIS
Conclusions on the source comparison • Both sources provide data to better than 2 seconds in this area • Both B th sources provide id good dd data t ffor th the shallow h ll events t • The onSEIS is a lower frequency source than the EnviroVIbe • The cycle time of the two sources is about the same for 4 x 20 second sweeps and 16 impacts per shot point
•The comparisons are made using receiver gathers at different locations •The onSEIS data is used to make the comparisons
Receiver gather at flag 109 for all onSEIS shots with offsets >30m
SM24
GS-One
RTC4.5
Spectra of the receivers from the gathers at flag 109
Blue: SM24 Green: RTC4.5 Red: GS-One
Expanded spectra of the receivers from the gathers at flag 109
Blue: SM24 Green: RTC4.5 Red: GS-One
R Raw
Blue: SM24 Green: RTC4.5 Red: GS-One
Af low After l ffrequency recovery
Spectra of the receivers from the gathers at flag 148
Blue: SM24 Green: RTC4.5 Red: GS-One
R Raw
Blue: SM24 Green: RTC4.5 Red: GS-One
Af low After l ffrequency recovery
Conclusions on the geophone comparison • After low frequency recovery, all geophones track very closely down to 5Hz, below which the RTC4.5 shows a better noise floor • The three geophones show the expected difference in output levels measured at the noise floor • The GS-One devolves into noise about 1Hz below the SM24, and the RTC4.5 about 1Hz below that • For this type of survey, any of the geophones would be adequate, since there is very little data below 5Hz for the onSEIS, 10Hz for the EnviroVibe
Hussar sensor comparison
Ion-Sensor SM-24-1k8
Ion-Sensor SM7 3C
Weihai Sunfull PS-4.5B
Vectorseis 3C
Nanometrics Trillium Compact
The specifications of the geophones Geophone p Sensitivityy v/m/s / / Sensitivityy v/m/s / / db wrt sm7 (open circuit) (damped) SM7 28.8 21 0.00 PS-4.5B 28.8 28.8 2.74 SM24-1k8 82 75.2 11.08 Trillium 750 750 31.06
518
519
520
521
522
523
524
525
526
527
528
529
530
The spread layout Line 5 Line 4 Line 3 Line 2 Line 1 Line 1: Vectorseis every 10m (flags 117 to 564) 10m Line 2: Sensor SM7 3C every 10m (flags 117 to 564) Li 3 Line 3: PS PS-4.5B 4 5B 1C every 20m 20 (flags (fl 117 to t 563) Line 4: Sensor SM124-1k8 1C every 20m (flag 469 to 563) Line 5: Nanometrics Trillium Compact every 200m (spaced along line)
Receiver gathers at flag 523 for dynamite shots with offset >140m
SM7
SM24-1k8
PS-4.5B
Vectorseis
Receiver gathers at flag 523 for dynamite shots with offset >140m
l Blue: SM7 Red: SM24-1k8 Green: PS-4.5B g Vectorseis Orange: Purple: Vectorseis integrated Black: Nanometrics Trillium (at flag 524)
Receiver gathers at flag 524 for dynamite shots with offset >140m
Blue: SM7 with LFR Purple: Vectorseis integrated Black: Nanometrics Trillium
Expanded spectra for receiver gathers at flag 523 for dynamite
Blue: SM7 Red: SM24-1k8 G ee PS-4.5B S 5 Green: Purple: Vectorseis integrated Black: Nanometrics Trillium (at flag 524)
Raw
After low frequency recovery
Expanded spectra for receiver gathers at flag 469 for dynamite
From the sensors at the odd flags between 469 and 563
Conclusions on the geophone comparison • All four sensors provide good data down to about 3Hz • The low frequency recovery is a valid method of improving the bandwidth for all the geophones • The determination of noise vs signal below 5Hz needs to be better defined • There is a lot more work required to investigate the very low frequency response of these sensors (1 – 5 Hz)
Acknowledgments For the Priddis survey: • Geokinetics for the loan of the onSEIS seismic source and their assistance in the field • OYO-Geospace for the loan of the GS-One 10Hz geophones For the Hussar survey: •Ion-Sensor for the donation of the SM24-1k8 geophones to CREWES •INOVA for making the INOVA 364 vibrator available for this survey •Geokinetics for the field work and co-ordination of the project •Husky for making it possible •Nanometrics for the loan of the Trillium Compact seismometers as a calibrated sensor for the comparison work CREWES sponsors and NSERC
