the earth’s near surface as a vibroseis signal generator
DESCRIPTION
The Earth’s Near Surface as a Vibroseis Signal Generator. Zhiyong Jiang. University of Utah. Outline. Introduction Methodology Synthetic Data Test Conclusions. Motivation: in Indonesia gas hydrates blur the reflections. g. s. s’. x. Outline. Introduction Methodology - PowerPoint PPT PresentationTRANSCRIPT
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The Earth’s Near Surface as The Earth’s Near Surface as a Vibroseis Signal Generatora Vibroseis Signal Generator
Zhiyong JiangZhiyong Jiang
University of UtahUniversity of Utah
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OutlineOutline
• IntroductionIntroduction• MethodologyMethodology• Synthetic Data TestSynthetic Data Test• ConclusionsConclusions
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Motivation: in Indonesia gas Motivation: in Indonesia gas hydrates blur the reflectionshydrates blur the reflections
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OutlineOutline
• IntroductionIntroduction• MethodologyMethodology• Synthetic Data TestSynthetic Data Test• ConclusionsConclusions
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Review: 1st-order Multiple Imaging with Review: 1st-order Multiple Imaging with Crosscorrelation MigrationCrosscorrelation Migration
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Review: 1st-order Multiple Imaging with Review: 1st-order Multiple Imaging with Crosscorrelation MigrationCrosscorrelation Migration
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Review: Near Surface Scattering Decon.Review: Near Surface Scattering Decon.
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Review: Near Surface Scattering Decon.Review: Near Surface Scattering Decon.
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Why name it “EAV” (Earth as a Why name it “EAV” (Earth as a vibroseis signal generator)vibroseis signal generator)
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Pilot signalPilot signalVibroseis traceVibroseis trace
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OutlineOutline
• IntroductionIntroduction• MethodologyMethodology• Synthetic Data TestSynthetic Data Test• ConclusionsConclusions
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Velocity ModelVelocity Model
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Shots: 676; Receivers: 50 (1100m -1600m)Shots: 676; Receivers: 50 (1100m -1600m)
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Tim
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ime
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Downgoing Downgoing componentcomponent
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CRG 33CRG 33
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ime
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Early part Early part (pilot signal)(pilot signal)
Late part Late part (vibroseis trace)(vibroseis trace)
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EAV to Upgoing ComponentEAV to Upgoing Component
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EAV to Downgoing ComponentEAV to Downgoing Component
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Primary Migration ImagePrimary Migration Image
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11stst-order Multiple with -order Multiple with Crosscorrelation MigrationCrosscorrelation Migration
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EAV to Downgoing ComponentEAV to Downgoing Component
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OutlineOutline
• IntroductionIntroduction• MethodologyMethodology• Synthetic Data TestSynthetic Data Test• ConclusionsConclusions
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ConclusionConclusion
• Free surface points can be regarded as Free surface points can be regarded as vibroseis signal generator, and direct waves, vibroseis signal generator, and direct waves, primary reflections, multiple reflections can primary reflections, multiple reflections can be regarded as the pilot signal, the response be regarded as the pilot signal, the response can be thought of as vibroseis tracecan be thought of as vibroseis trace
• With EAV, a ringy trace can be compressed With EAV, a ringy trace can be compressed into an impulsive primary reflectioninto an impulsive primary reflection
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Pilot Pilot signalsignal
vibroseis vibroseis tracetrace
Future work: use EAV to deblur the scattering due Future work: use EAV to deblur the scattering due to gas hydrates near the sea floor to gas hydrates near the sea floor
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We thank UTAM sponsors for their We thank UTAM sponsors for their financial supportfinancial support
AcknowledgmentsAcknowledgments