Transcript of Industry-style combined active/passive dense array surveys: directions and issues. Dan Hollis,...
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- Industry-style combined active/passive dense array surveys:
directions and issues. Dan Hollis, NodalSeismic, LLC 26 January
2014Active Source Workshop
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- Road Map Continuous Seismic Data Recording in Active Source
Surveys Equipment Operations Long Beach 3D Survey Description
Lessons Learned Modifications for Enhancing Passive Component Santa
Fe Springs 3D Generic Concept Fisher County 3D Data Products Issues
Going Forward Conclusions/Questions 26 January 2014Active Source
Workshop
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- Autonomous Node System 26 January 2014Active Source Workshop
Spike Internal Geophone Element (10 Hz, vertical) NAND Flash Memory
Li-ion Batteries 2-week life @ 24/7 (5-week model in Q4 13) GPS
Receiver 24-bit A/D Convertor Controller-processor
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- 26 January 2014Active Source Workshop Autonomous Node System
GEN-2, 3-C 3 component 30-day battery life @ 24/7 1.8
kilograms
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- Traditional 3D Recording Array and Operations 26 January
2014Active Source Workshop 300 square mile survey (10 x 30) 1320
RLS & 220 RI (dark blue) Nominal 18x100 Active Recording Patch
(light blue)
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- Receiver Array Flexibility 26 January 2014Active Source
Workshop Traditional - 990 RLS x 110 RIRURA - 330 RLS x 330 RI Both
designs are about 256 receivers per square mile
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- Road Map Continuous Seismic Data Recording in Active Source
Surveys Equipment Operations Long Beach 3D Survey Description
Lessons Learned Modifications for Enhancing Passive Component Santa
Fe Springs 3D Generic Concept Fisher County 3D Data Products Issues
Going Forward Conclusions/Questions 26 January 2014Active Source
Workshop
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- Long Beach 3D Seismic Survey 26 January 2014Active Source
Workshop -5400 receivers/nodes (static) -Spacing ~100m inline &
X-line -24 hr/day, 7 day/week recording -Active sourcing weekdays
and Sunday morning -2 ms sample interval -3 Hz low cut filter -10
Hz CT-30 geophone (vertical)
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- Long Beach 3D Passive Seismic Dataset ~ 6 month duration ~ 150
TB of data Several significant local events Teleseismic events
(March 11, 2011 Japan earthquake) Passive Data Analyses Ambient
Noise Correlation Receiver function Travel-time tomography
Microseismic 26 January 2014Active Source Workshop
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- Carson EQ -12 Hz HC 26 January 2014Active Source Workshop
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- Long Beach 3D Lessons Learned Preserving continuous data
Frequency response and instrument filters Uniform vs traditional
receiver arrays Survey Design Considerations Stations external to
survey to reduce edge effects with ambient noise correlation
analysis Larger size surveys, insufficient equipment to cover
entire survey 26 January 2014Active Source Workshop
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- Edge Effects - Anisotropic Velocity Variations 1.25 Hz1.00 Hz
Azimuth 1.0 Hz 17 December 2013Shell Lunch-n-Learn
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- Road Map Continuous Seismic Data Recording in Active Source
Surveys Equipment Operations Long Beach 3D Survey Description
Lessons Learned Modifications for Enhancing Passive Component Santa
Fe Springs 3D Generic Concept Fisher County 3D Data Products Issues
Going Forward Conclusions/Questions 26 January 2014Active Source
Workshop
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- 6 km 26 January 2014Active Source Workshop Santa Fe Springs
3D
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- Generic Concept Outliers Active Source Patch Backbone Array
Conventional survey outline 26 January 2014Active Source
Workshop
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- Fisher Co, TX 3D Active Source Receiver Array 26 January
2014Active Source Workshop
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- Fisher Co, TX 3D Outlier and Backbone Array 26 January
2014Active Source Workshop
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- Fisher Co, TX 3D Proposed Broadband Array 26 January 2014Active
Source Workshop
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- Road Map Continuous Seismic Data Recording in Active Source
Surveys Equipment Operations Long Beach 3D Survey Description
Lessons Learned Modifications for Enhancing Passive Component Santa
Fe Springs 3D Generic Concept Fisher County 3D Data Products Issues
Going Forward Conclusions/Questions 26 January 2014Active Source
Workshop
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- Data Products (and Formats) Active Receiver Patch Shot Slice
Data SEG-Y Active Receiver Patch Continuous Data SEG-D Outliers and
Backbone Array SEG-D Shot Timing/Location Data SBS OB Logs Survey
Data SEG-P1 26 January 2014Active Source Workshop
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- Road Map Continuous Seismic Data Recording in Active Source
Surveys Equipment Operations Long Beach 3D Survey Description
Lessons Learned Modifications for Enhancing Passive Component Santa
Fe Springs 3D Generic Concept Fisher County 3D Data Products Issues
Going Forward Conclusions/Questions 26 January 2014Active Source
Workshop
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- Issues Going Forward Data format for continuous data. SEG-D not
common for long record lengths. 26 January 2014Active Source
Workshop
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- Questions 26 January 2014Active Source Workshop