Using full wave seismic modeling to test 4D repeatability for Libra pre-salt field

Deplante, Christian; Costa, Matthew L.; Santos, Marcos dos; Dias, R.; Mello, Valneli da Silva; Meirelles, B.; Araujo, S.; García, Daniel Marco; Sansonowsk, R.

doi:10.22564/16cisbgf2019.343

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model outside the reservoir is derived from full waveform inversion and full band acoustic impedance, subsequently mapped to 𝑉 𝑝 , 𝑉 𝑠 , and density via chained formulas. The 4D anomalies present in the model include complex fluid fronts like alternated water and gas streaks and reinjected gas (Deplante et al 2019).…”

Section: Application 1: Saturation and Pressure Changesmentioning

confidence: 99%

Angle-dependent time-shift modeling by 3D ray-tracing

Dias¹,

Mello²,

Borges³

et al. 2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

View full text Add to dashboard Cite

We developed an algorithm to calculate angle-dependent time-shifts with a 3D ray-tracing modeling engine. Two subsurface 4D models helped us evaluating the benefits of the methodology for scenarios of fluid and pressure changes, as well as geomechanical effects in the overburden. The developed algorithm is computationally efficient, and the results show good agreement with crosscorrelation time-shifts from 3D full-wave modeled data. The proposed methodology addresses a major simplification in time-shift interpretation and has the potential to improve 4D studies, in comparison with the standard vertical propagation approach. The mitigation of uncertainties, avoiding interpretation pitfalls, as well as the use of anglestack time-shifts, add up to a more robust interpretation of time-lapse data.

show abstract

Section: Application 1: Saturation and Pressure Changesmentioning

confidence: 99%

Angle-dependent time-shift modeling by 3D ray-tracing

Dias¹,

Mello²,

Borges³

et al. 2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

View full text Add to dashboard Cite

show abstract

Performance assessment of an iterative ensemble smoother with local analysis to assimilate big 4D seismic datasets applied to a complex pre-salt-like benchmark case

Maschio,

Silva Neto,

Davolio

et al. 2023

Journal of Geophysics and Engineering

View full text Add to dashboard Cite

The use of 4D seismic (4DS) (or time-lapse seismic, TLS) in data assimilation (DA) makes the process more complex due to the higher amount of data to be assimilated, requiring more robust methods and better computational resources (processing capacity and memory). The development and application of permanent seismic monitoring technologies have increased in the last years, improving the overall 4D seismic quality, in terms of signal resolution and repeatability. However, a massive amount of data is generated from the multiple monitors, making the incorporation of 4DS data in the DA process much more complex. Therefore, robust DA methods capable of dealing with huge amount of data effectively and efficiently are essential. This paper aims to assess the performance of an iterative ensemble smoother method, named Subspace Ensemble Randomized Maximum Likelihood with a local analysis (SEnRML-LA), to assimilate a big data set. The method was applied in a challenging pre-salt-like benchmark case with eight seismic surveys, one base, and seven monitors. The 4DS data are the impedance ratios (between two consecutive monitors) in 15 seismic horizons, totaling 105 maps to be assimilated. To our best knowledge, this is state of the art in terms of practical applications in data assimilation. It was possible to assimilate all the data simultaneously: the 105 horizons for the 4DS data and the wells’ production and pressure data. The data assimilation was successful in terms of results quality and method performance. We also ran a case assimilating only well data for comparison purposes.

show abstract

Using full wave seismic modeling to test 4D repeatability for Libra pre-salt field

Cited by 2 publications

References 0 publications

Angle-dependent time-shift modeling by 3D ray-tracing

Angle-dependent time-shift modeling by 3D ray-tracing

Performance assessment of an iterative ensemble smoother with local analysis to assimilate big 4D seismic datasets applied to a complex pre-salt-like benchmark case

Contact Info

Product

Resources

About