The complexity of vibrator baseplate-ground interaction measured with a thin-film pressure pad and a downhole tool

Dean, Tim; Vermeer, P.; Laycock, M.; Tulett, J.; Lane, D.

doi:10.3997/2214-4609.201413129

Access Status

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Authors

Dean, Tim

Vermeer, P.

Laycock, M.

Tulett, J.

Lane, D.

Date

2015

Type

Conference Paper

Metadata

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Citation

Dean, T. and Vermeer, P. and Laycock, M. and Tulett, J. and Lane, D. 2015. The complexity of vibrator baseplate-ground interaction measured with a thin-film pressure pad and a downhole tool, in Proceedings of the 77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment: Seismic Survey Design and Acquisition Hardware, Jun 1-4 2015, pp. 2126-2130. Madrid: EAGE.

Source Title

77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment

DOI

10.3997/2214-4609.201413129

ISBN

9781510806627

School

WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)

URI

http://hdl.handle.net/20.500.11937/60290

Collection

Curtin Research Publications

Abstract

When a seismic hydraulic vibrator sweeps, it emits the signal we desire as well as a series of harmonics due to the non-linear behaviour of the hydraulic system and the baseplate-earth contact. The phase of the fundamental component of the transmitted signal also varies significantly from that of the pilot, which results in distortion of the Klauder wavelet. If we could record a more accurate estimate of the transmitted signal we could improve the signal itself (through the feedback loop of the vibrator's controller) and/or reduce its effects during processing. In this paper we show that the pressure distribution beneath the baseplate is more complex than previously thought but that thin-film pressure pads are a promising method for measuring the signature of a vibrator.