Attenuation of seismic water-column noise, tested on seismic data from the Grane field

Landrø, Martin

doi:10.1190/1.2740020

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…They have a strong scattering in the amplitudes spectrum, hindering the filter operations that use frequency as the key to noise location, however they all have strong linear, preserved almost faithfully, even after NMO correction and stacking. A brief discussion about harmonic modes and head waves noise was made by Landro (2007).…”

Section: Application Methodologymentioning

confidence: 99%

Noise Attenuation in Seismic Reflection Data Combining Empirical Mode Decomposition and SVD Filtering

Alves¹,

Porsani²

2016

Rev. Bras. Geof.

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ABSTRACT. Noises are common events in seismic reflection that have very striking features in the seismograms, hindering the data processing and interpretation. The attenuation of seismic noise is a challenge, in general frequency filters are employed, but they often do not show good results. The characteristic of noise...Keywords: seismic noise, Empirical Mode Decomposition, Singular Value Decomposition. RESUMO. Ruídos são eventos comuns na sísmica de reflexão que possuem características bem marcantes nos sismogramas, atrapalhando o processamento e interpretação dos dados. A atenuação de ruídos sísmicos é um desafio, em geral são utilizados filtros de...Palavras-chave: ruídos sísmicos, Decomposição em Modos Empíricos, Decomposição em Valores Singulares.

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Section: Application Methodologymentioning

confidence: 99%

Noise Attenuation in Seismic Reflection Data Combining Empirical Mode Decomposition and SVD Filtering

Alves¹,

Porsani²

2016

Rev. Bras. Geof.

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“…An AVO model for the top interfaces of each of the reservoirs has been obtained and below is a model for the top of the Tarbert Formation from zero offset to 31°(Far offset angle from ray tracing according to Landrø M., 2007).…”

Section: Amplitude Versus Offset (Avo) Modelling For Various Fluid Substitution Scenariosmentioning

confidence: 99%

Time lapse (4D) and AVO analysis: A case study of Gullfaks field, Northern North Sea

Umoren

George

2018

NRIAG Journal of Astronomy and Geophysics

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A 4D seismic or time lapse survey has been used to investigate the amplitude versus offset (AVO) effects on seismic data in order to identify anomalies in the Gullfaks field for three different reservoir intervals namely the Tarbert, Cook and Statfjord reservoirs. Repeatability analysis has shown that the earlier seismic vintages are the most unreliable for amplitude anomaly analysis as normalised root-mean square (NRMS) values are greater than 50%. This is above the threshold of good and medium repeatability. Fluid substitution models show increases in both P-wave velocity and density for increasing water saturations with a maximum change of 7.33% in the Pwave velocity, and this is in line with predictions from previous work using the Biot -Gassman equations. AVO modelling for the top Tarbert Formation interface produced scenarios of increasing amplitudes with offset for the presence of hydrocarbons, which dim out with 100% brine saturation. This correlates to class III gas sands for different situations of varying Poisson's ratio across an interface, which has been previously modelled. Two anomalies were identified with one being related to increasing pressure due to water injection correlating to poor permeability around injector well 34/10-B-33. The second anomaly is a case of potential unswept hydrocarbons that displayed a consistent bright spot throughout all of the seismic vintages (in-inlines and crosslines). AVO attribute analysis of this event produced a class II anomaly. However, when comparing near and far offset seismic data, dimming effect was observed producing contrasting evidence. The dimming offset is viewed to have been as a result of poor repeatability values at far offsets. The modelling of the fluid contents in the studied formations to conform to existing literatures justifies the efficacy of the method.

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The effect of noise generated by previous shots on seismic reflection data

Landrø

2008

GEOPHYSICS

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In marine seismic acquisition, the typical time interval between two adjacent shots is about [Formula: see text]. This interval is considered sufficient to avoid the signal from one shot interfering with the signal from the next shot. However, when we are looking for very weak signals or weak changes in a given signal (time-lapse seismic), the influence of the shot-generated noise can be of importance. In the present work, shot records with a recording time of [Formula: see text] are used to analyze the influence of the shot-generated noise from the previous shot. Simple decay models are used to match the observed rms decay curves. These calibrated models are used to estimate variations in signal-to-noise ratio versus shot time interval and source strength. For instance, if the source strength is doubled and the time interval between two shots is increased from [Formula: see text], an improvement in the signal-to-shot-generated noise from the previous shot of [Formula: see text] is expected. Especially for time-lapse seismic using permanently installed receivers, this way of increasing the S/N might be useful.

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Attenuation of seismic water-column noise, tested on seismic data from the Grane field

Cited by 7 publications

References 13 publications

Noise Attenuation in Seismic Reflection Data Combining Empirical Mode Decomposition and SVD Filtering

Noise Attenuation in Seismic Reflection Data Combining Empirical Mode Decomposition and SVD Filtering

Time lapse (4D) and AVO analysis: A case study of Gullfaks field, Northern North Sea

The effect of noise generated by previous shots on seismic reflection data

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