Enhanced low frequency signal processing for sub‐basalt imaging

Woodburn, N.; Hardwick, Anthony; Travis, T.

doi:10.1190/1.3627964

Cited by 6 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Boosted noise is cancelled by a multi-domain approach in processing (e.g. Hardwick et al, 2010;Woodburn et al, 2011) and provides a cost effective alternative to new broadband acquisition in the area. Enhancement of the high frequencies should allow more accurate natural log spectral ratios to be estimated as part of any Q eff compensation scheme relative to the flattened source amplitude spectra in Figure 2(a).…”

Section: Bandwidth Extension Using Low and High Frequency Boosting Opmentioning

confidence: 99%

Enhanced imaging using bandwidth extending operators and pre-stack Q-inversion over the northwest European volcanic margin

Hardwick¹,

Whittaker

Woodburn³

2012

SEG Technical Program Expanded Abstracts 2012

View full text Add to dashboard Cite

Extensive sequences of flood basalts dominate the northwest European Atlantic margin. The basalt flows absorb and scatter the higher frequencies present in any source wavelet through intrinsic and apparent seismic attenuation. Successful sub-basalt imaging therefore tends to focus on the generation of low frequencies in acquisition and retention in processing. Conversely, the Rosebank discovery in the Faroe-Shetland Basin of oil bearing sequences interbedded within the Basalt illustrates that high frequencies need to be recovered in order to delineate subtle stratigraphic plays. For this we require broad bandwidth, a robust approach to signal to noise improvement and accurate knowledge of the seismic quality factor (Q) to compensate for locally strong attenuation effects. We show that the required bandwidth can be obtained from conventionally acquired seismic data through the use of low and high frequency boosting operators and application of a horizon consistent Q field. The latter is derived using the pre-stack Q-inversion (PSQI) method to determine effective Q in defined intervals from the data itself. Through a combination of both techniques a substantial uplift in resolution is demonstrated for the highly prospective intra-basalt units with useable frequencies up to 50Hz.

show abstract

Section: Bandwidth Extension Using Low and High Frequency Boosting Opmentioning

confidence: 99%