1887

Abstract

Summary

The feasibility of using an air gun near the sea floor as shear-wave source has been investigated. With an air gun near the sea floor, an evanescent P-wave in the water becomes a propagating S-wave in the sea floor, such that it seems that a pure shear-wave source has been used at the sea floor. This type of wave has been called a P*S wave. An experiment with such a set-up has been carried out at the Valhall field. For that case, modelling shows that shear-wave related event of the type of P*S waves can be expected with such a set-up. Especially at larger offsets, P*S waves can be expected. When analysing the field records and Constant-Velocity Stacks, it is hard to find P*S-wave reflected events. On the other hand, P*S-wave refracted events can be discerned in records. These events can be brought up to stack level and imaged, as shown in this paper.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201413356
2015-06-01
2024-05-21
Loading full text...

Full text loading...

References

  1. Allouche, N., Drijkoningen, G.G., Versteeg, W. and Ghose, R.
    [2011] Converted waves in a shallow marine environment: Experimental and modelling studies. Geophysics, 76, T1–T11.
    [Google Scholar]
  2. Drijkoningen, G.G., el Allouche, N., Thorbecke, J. and Bada, G.
    [2012] Nongeometrically converted shear waves in marine streamer data. Geophysics, 77, P45–P56.
    [Google Scholar]
/content/papers/10.3997/2214-4609.201413356
Loading
/content/papers/10.3997/2214-4609.201413356
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error