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SEAM TTI Model

Fig 1:  Seam model is a 3D TTI model with size 40km long, 35km width and 15km depth. 

Forward Modeling

Fig 2: Shots positioned 20 meters beneath the sea surface, arranged with a spacing of 40m x 40m

Fig 3: Receivers positioned on the sea bottom, arranged with a spacing of 1000m x 1000m

SEAM_SimulateData.jpg

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  Acquisition setup:

  • TTI acoustic wave equation modeling with density

  • 876876 shots: spacing 40m × 40m, at depth 20m

  • 1476 OBN nodes: spacing 1km × 1km, on the seafloor

  • Downgoing ghost free primary data for mirror migration

  • Common node gathers: maximum offsets are 40km and 35km in X and Y, respectively

  • 40Hz, 16s recording time

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Fig 4: 40Hz simulation result

RTM 

                     RTM key parameters

  • TTI RTM mirror imaging

  • Input:

    • 1476 nodes

    • Max frequency: 40 Hz

    • Max offset: 17.5 km

    • Max time : 16s

  • Dual output in one run: impedance and reflectivity

  • Output:

    • Max depth: 15km

    • dz: 8m

    • CDP: 25m × 25m

    • Range: 40km×35km

Seam_inline801_mig.jpg

Fig 5: Seam migration result in inline 801.   Left: impedance   Right: reflectivity 

Seam_inline901_true.jpg

Fig 6: Seam migration result in inline 901.   Left: impedance   Right: reflectivity 

Seam_inline1001_true.jpg

Fig 7: Seam migration result in inline 1001.   Left: impedance   Right: reflectivity 

Seam_xline_1001_mig.jpg

Fig 8: Seam migration result in xline 1001.   Left: impedance   Right: reflectivity 

Seam_xline1101_true.jpg

Fig 9: Seam migration result in xline 1101.   Left: impedance   Right: reflectivity 

Seam_xline1501_mig.jpg

Fig 10: Seam migration result in xline 1501.   Left: impedance   Right: reflectivity 

Seam_zslice_7000.png

Fig 11: Seam migration reflectivity in depth 7000 and 8000

Seam_zslice_13480_mig.jpg

Fig 12: Seam migration reflectivity in depth 13480 and 14300

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