The key technique of OBS p-wave imaging processing in Qiongdongnan area

XU Yunxia; WEN Pengfei; ZHANG Baojin; LI Fuyuan

doi:10.16562/j.cnki.0256-1492.2018.05.018

2018 Vol. 38, No. 5

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Article navigation > Marine Geology & Quaternary Geology > 2018 > 38(5): 185-192

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XU Yunxia, WEN Pengfei, ZHANG Baojin, LI Fuyuan. The key technique of OBS p-wave imaging processing in Qiongdongnan area[J]. Marine Geology & Quaternary Geology, 2018, 38(5): 185-192. doi: 10.16562/j.cnki.0256-1492.2018.05.018

Citation:

XU Yunxia, WEN Pengfei, ZHANG Baojin, LI Fuyuan. The key technique of OBS p-wave imaging processing in Qiongdongnan area[J]. Marine Geology & Quaternary Geology, 2018, 38(5): 185-192. doi: 10.16562/j.cnki.0256-1492.2018.05.018

The key technique of OBS p-wave imaging processing in Qiongdongnan area

Key Laboratory of Marine Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, Guangzhou 510760, China

Received Date: 26 October 2016

Revised Date: 23 December 2016

Publish Date: 28 October 2018

Abstract

Abstract

The OBS data acquisition has the advantages of less receiver and longer distance between receivers and thus may receive both the press wave and shear wave at the same time. As far as imaging processing is concerned, OBS faces more challenges comparing to the conventional seismic data processing. This article focuses on the OBS p-wave data processing as follows. 1. Direct wave is used for OBS reposition to ensure the correctness of location and to lay a solid foundation for correct OBS imaging; 2. P component and z component are used for demarcating to make the two component data consistent on frequency, amplitude and phase for merging processing; 3. through the analysis of wave field to effectively separate upgoing and downgoing wave field data and use the wider range of imaging's downgoing data to do the mirror migration. Finally we can obtain OBS p-wave profiles with clear sea bottom imaging, high resolution imaging below the sea bottom, and more accurate images in migration position. The final section has wide frequency band, rich frequency information, and can provide a lithological interpretation of a hydrate layer without well with rich frequency information of stacked seismic data.
- OBS /
- reposition /
- PZ sum /
- wave field separation /
- downgoing wave field /
- mirror migration

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References

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