Yuanzhong Chen, Guangmin Hu, Yanpeng Li, Yunjiang Rao, Shujie An, Jingjing Zong, Hao Zhang. Multi-Wave Imaging Methods for Distributed Acoustic Sensing Vertical Seismic Profile Assisted by Artificial Intelligence Processing[J]. Acta Optica Sinica, 2024, 44(1): 0106021
- Acta Optica Sinica
- Vol. 44, Issue 1, 0106021 (2024)
Fig. 1. DAS Walkaway-VSP observation system
Fig. 2. DAS-VSP shot gathers at different offsets
Fig. 3. DAS-VSP near-offset shot gather. (a) Full wave field record; (b) P-P wave travel time record at different depths; (c) P-S wave travel time record at different depths
Fig. 4. DAS-VSP shot gathers before and after denoising. (a) Before denoising; (b) after MCA denoising; (c) removed noise
Fig. 5. DAS-VSP shot spectrograms before and after denoising. (a) Before denoising; (b) after MCA denoising; (c) removed noise
Fig. 6. Noise records removed by different denoising methods. (a) Bandpass filtering method; (b) MCA method
Fig. 7. Flow chart of DAS-VSP multi-wave data separation based on artificial intelligence methods
Fig. 8. Upgoing P-P wave record after wave field separation
Fig. 9. Upgoing P-S wave record after wave field separation
Fig. 10. FK spectrum after wave field separation of shot ③. (a) Upgoing P-P wave; (b) upgoing P-S wave
Fig. 11. Partial convolutional U-net network architecture map
Fig. 12. Flow chart of training process
Fig. 13. DAS-VSP common receiver gathers before and after AI assisted regularization. (a) Before regularization; (b) after regularization
Fig. 14. DAS-VSP final images for downgoing multiples before and after AI assisted regularization. (a) Before regularization; (b) after regularization
Fig. 15. Flow chart of VSP multi-wave imaging processing based on minimum travel time
Fig. 16. VSP imaging process based on minimum travel time. (a) 1 VSP reflected wave data; (b) travel time table corresponding to 200 grids with minimum travel time; (c) imaging profile
Fig. 17. DAS Walkaway-VSP imaging profiles obtained based on minimum travel time imaging method. (a) upgoing P-P wave imaging profile; (b) upgoing P-S wave imaging profile
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