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Tomostatic Waveform Tomography for Mapleton, Utah data. Jianming Sheng, and Maike Buddensiek. University of Utah. Feb. 5, 2004. Outline. Motivation. Data Preprocessings. Waveform Tomogram. Summary. First-break + First-peak. 0. 2500. Depth (m). 500. m/s. 45. 0. Distances (m). 80.

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tomostatic waveform tomography for mapleton utah data

Tomostatic Waveform Tomography for Mapleton, Utah data

Jianming Sheng, and Maike Buddensiek

University of Utah

Feb. 5, 2004

outline
Outline

Motivation

Data Preprocessings

Waveform Tomogram

Summary

first break first peak
First-break + First-peak

0

2500

Depth (m)

500

m/s

45

0

Distances (m)

80

motivations

Observed

Predicted

Motivations
  • Produce better seismic image by fitting waveforms
recorded csg 49
Recorded CSG # 49

0

168 shots

168 receiver

Interval: 5m

Time (sec.)

dt: 0.5 ms

length: 1s

0.15

Geophone #

20

160

outline1
Outline

Motivation

Data Preprocessings

Waveform Tomogram

Summary

data preprocessings
Data Preprocessings
  • Instrument caused amplitude anomalies
slide8

Amplitude Vs. Traveltime

40

Dashed: Fitted

Solid: Observed

Log-Amplitude

20

0

0.09

Traveltime (sec.)

data preprocessings1
Data Preprocessings
  • Instrument caused amplitude anomalies
  • Earth attenuation
slide10

Frequency Spectrum Vs. Offset

0.0

Frequency (Hz)

100

0

60

Offset (m)

attenuation compensation

Spectrum

variance

Attenuation factor

Centroid frequency

Attenuation Compensation

Liao and McMechan (1997)

frequency vs traveltime

Q=24.0013

Frequency vs. Traveltime

85

Frequency (Hz)

40

0

0.1

Traveltime (sec.)

data preprocessings2

multiply

to spectrum

multiply

for the geometrical spreading

Data Preprocessings
  • Instrument caused amplitude anomalies
  • Earth attenuation
  • Transform data to 2D format
preprocessed csg 49
Preprocessed CSG # 49

0

Time (sec.)

0.15

Geophone #

20

160

slide15

Frequency Spectrum Vs. Offset

0.0

Frequency (Hz)

100

0

60

Offset (m)

slide16

Frequency Spectrum Vs. Offset

0.0

Frequency (Hz)

100

0

60

Offset (m)

outline2
Outline

Motivation

Data Preprocessings

Waveform Tomogram

Summary

misfit function

Selected receiver

Convolution

Misfit Function

Frazer and Sun, 1998

waveform tomogram
Waveform Tomogram

0

2500

Depth (m)

500

m/s

45

0

Distances (m)

80

first break first peak1
First-break + First-peak

0

2500

Depth (m)

500

m/s

45

0

Distances (m)

80

outline3
Outline

Motivation

Data Preprocessings

Waveform Tomogram

Summary

summary
Summary
  • The waveform tomogram does not show
  • much improvement compared to the first-
  • break and first-peak tomogram.
  • Elastic modeling code is needed.
slide23

Acknowledgment

I thank the sponsors of the 2003 UTAM Consortium for their financial support .