VSP up- and downgoing wavefield separation

Citation Author(s):
Zuochen
Mu
Submitted by:
Zuochen Mu
Last updated:
Thu, 02/09/2023 - 22:04
DOI:
10.21227/4dr6-a804
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Abstract 

This dataset consists of two parts: 

1)original VSP data

---- syn.txt    -> synthetic VSP record 

---- SEAM.xlsx   -> the 66-th shot of SEAM Phase I RPSEA Elastic Simulations

---- aN.txt   -> real VSP record in the Dong area

 

2)coressponding up- and downgoing separation results

---- results_Syn -> abalation experimental results for self validation

---- results_SEAM -> comparison experimental results on SEAM open data

---- results_Dong -> comparison experimental results on real VSP data

 

Instructions: 

This dataset consists of two parts: 

 

1)original VSP data

---- syn.txt    -> synthetic VSP record

       A simple model is built for synthetic zero-offset VSP wavefields. The model consists of four layers, the Ricker wavelet with a frequency of 30 Hz is used as the source signal, and the shot is set 50 m underground with an offset of 12 m. Geophones are arranged from 250 to 4250 m with an interval of 10 m. We record the observation from 0.03 to 4.11 s with a sampling interval of 4 ms. Fig. 5(b) shows the synthetic VSP record obtained by this model. 

 

---- SEAM.xlsx   -> the 66-th shot of SEAM Phase I RPSEA Elastic Simulations

      SEAM Phase I RPSEA Elastic Simulations is a 2D walk-away VSP with a total of 151 shots along the line at North = 23900 m, the well is located at North 23900 m, East 10075 m, geophones are set between depths of 1000 m and 7990 m with an interval of 15 m, and the sampling period is 8 ms. SEAM.xlsx is a selection of the 66-th shot at East = 10200 m with an offset of 125 m.

 

---- aN.txt   -> real VSP record in the Dong area

     aN.txt records the real VSP data in the Dong area. The shot point is set 20 m underground with an offset of 122 m, geophones are arranged from depth 20 to 5840 m, the spatial sampling interval of the first 19 geophones is 10 m, and it changes to 20 m from the 20-th geophone, with a sampling period of 1 ms.

 

2)coressponding up- and downgoing separation results

 

---- results_Syn -> abalation experimental results for self validation

       base -> Case 1: only reconstruction loss is performed

      cos  -> Case 2: reconstruction loss and cosine similarity loss are performed

      gra  -> Case 3: reconstruction loss and gradient loss are performed

      cos+gra -> Case 4: reconstruction loss, cosine similarity loss and gradient are performed

 

---- results_SEAM -> comparison experimental results on SEAM open data

       ( Automatic gain control (AGC) is utilized for better visualization)

 

       fkdown.xlsx -> downgoing wavefields separated by f-k filtering

       fkup.xlsx -> upgoing wavefields separated by f-k filtering

       mddown.xlsx -> downgoing wavefields separated by median filtering

       mdup.xlsx -> upgoing wavefields separated by median filtering

       mydown.xlsx -> downgoing wavefields separated by our method (dualCAE)

       myup.xlsx -> upgoing wavefields separated by our method (dualCAE)

 

---- results_Dong -> comparison experimental results on real VSP data

       ( Automatic gain control (AGC) is utilized for better visualization)

 

       fk_down.xlsx -> downgoing wavefields separated by f-k filtering

       fk_up.xlsx -> upgoing wavefields separated by f-k filtering

       md_down.xlsx -> downgoing wavefields separated by median filtering

       md_up.xlsx -> upgoing wavefields separated by median filtering

       my_down.xlsx -> downgoing wavefields separated by our method (dualCAE)

       my_up.xlsx -> upgoing wavefields separated by our method (dualCAE)

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