Value creation from 4D seismic at the Gullfaks Field: achievements and new challenges

Ouair, Youness El; Strønen, L. K.

doi:10.1190/1.2370206

Cited by 10 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acoustic impedance model was established from the baseline volume using full bandwidth of final wavelet with updated low frequency ( Figure 7 ). The 4D seismic vintages were simultaneously inverted into acoustic impedance using (20) simultaneous inversion approach. This was done using the full bandwidth of the updated low frequency and bandpass low frequency approach.…”

Section: Methodsmentioning

confidence: 99%

“…HC is the signal maximum frequency where no noise is retained above it and LP is the frequency at which the signal starts to be removed. The (20) simultaneous inversion workflow adopted for the 4D seismic inversion is shown in Figure 9 . The model inverted acoustic impedance was used to generate P-impedance attribute and amplitude slices from the inverted baseline and monitor volume.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of updated low frequency model in delineating bypassed hydrocarbon reservoir: A 4D seismic study of ’X’ - field, offshore, Niger Delta, Nigeria

Akpan¹

2020

IJST

View full text Add to dashboard Cite

Aim/objectives: The aim of this research is, to use Time lapse (4D) seismic and investigate the influence of low frequency update in deterministic model-based seismic inversion employed in delineating a prospect saturated with bypassed hydrocarbon accumulation. Method: The dataset employed in this study incorporates 4D seismic volumes with fifteen (15) years production, interval between 2001 baseline and 2016 monitor seismic vintages. The inversion was carried out using full bandwidth of the updated low frequency and bandpass filtered low frequency approaches. The seismic vintages (baseline and monitor) were simultaneously inverted into acoustic impedance volumes for the two approaches. The formation fluid and lithology were discriminated through fluid replacement modelling (FRM) based on the colour separation between brine and gas saturation scenarios. Findings: The two inversion methods employed reveal six (6) zones suspected to be saturated with bypassed hydrocarbons. The delineated bypassed zones are masked in the full bandwidth approach,depicting the effect of the updated low frequency model. Meanwhile, the bandpass filtered approach result presents a better delineated bypassed reservoir as the zones are more pronounced when compared with the full bandwidth approach. Porosity estimate reveals that the bandpass filtered approach is characterized with excellent porosity in the suspected bypassed zones. The results equally gave more reliable and full delineated bypassed zones. Originality and novelty: The dataset employed in this study were obtained from a producing hydrocarbon field which, interest is to maximize the production of oil/gas. The study will bridge the inherent gab observed in using model-based seismic inversion approach to analyse and interpret seismic data in order to delineate hydrocarbon prospects. The research reveals that,the model-based seismic inversion method is still very effective in delineating hydrocarbon prospect when the updated low frequency is bandpass filtered to remove the model effect which influences the inverted acoustic impedance results. Keywords: Porosity; frequency; bypassed; reservoir and impedance

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Assessment of updated low frequency model in delineating bypassed hydrocarbon reservoir: A 4D seismic study of ’X’ - field, offshore, Niger Delta, Nigeria

Akpan¹

2020

IJST

View full text Add to dashboard Cite

show abstract

“…Converting time-lapse seismic data to changes in pressures and saturations is a difficult task, which is currently not normally done. However, this is the topic of ongoing research; see, e.g., Landrøet al [17], Kirstetter et al [16], Buland and Ouair [5], and Ouair and Strønen [28].…”

Section: Introductionmentioning

confidence: 98%

A method for automatic history matching of a compositional reservoir simulator with multipoint flux approximation

et al. 2008

View full text Add to dashboard Cite

A method for history matching of an in-house petroleum reservoir compositional simulator with multipoint flux approximation is presented. This method is used for the estimation of unknown reservoir parameters, such as permeability and porosity, based on production data and inverted seismic data. The limitedmemory Broyden-Fletcher-Goldfarb-Shanno method is employed for minimization of the objective function, which represents the difference between simulated and observed data. In this work, we present the key features of the algorithm for calculations of the gradients of the objective function based on adjoint variables. The test example shows that the method is applicable to cases with anisotropic permeability fields, multipoint flux approximation, and arbitrary fluid compositions.

show abstract

Comprehensive seismic monitoring of an onshore carbonate reservoir: a case study from a desert environment

Smith

Bakulin

Jervis

et al. 2020

Active Geophysical Monitoring

View full text Add to dashboard Cite

Value creation from 4D seismic at the Gullfaks Field: achievements and new challenges

Cited by 10 publications

References 3 publications

Assessment of updated low frequency model in delineating bypassed hydrocarbon reservoir: A 4D seismic study of ’X’ - field, offshore, Niger Delta, Nigeria

Assessment of updated low frequency model in delineating bypassed hydrocarbon reservoir: A 4D seismic study of ’X’ - field, offshore, Niger Delta, Nigeria

A method for automatic history matching of a compositional reservoir simulator with multipoint flux approximation

Comprehensive seismic monitoring of an onshore carbonate reservoir: a case study from a desert environment

Contact Info

Product

Resources

About