Characterization of Gas Clouds Using Non-linear Full Waveform Inversion

Rahim, M. Faizal A.; Ulugergerli, Emin U.; Konuk, Tugrul; Ghazali, A.R.

doi:10.3997/2214-4609.20131858

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…The advantages of seismic redatuming have been increasingly acknowledged for achieving enhanced imaging and velocity model building compared to standard data processing [29]. Even with the existence of various redatuming methods, such as Wavefield Redatuming [30][31][32], and Marchenko redatuming [33][34][35][36], the fundamental principle remains consistent: dividing the subsurface into two distinct zones-the overburden and the target area. Then, the correction of transmission effects within the overburden is accomplished by employing a specific redatuming method to derive redatumed data.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Accurate Seismic Imaging through the Advanced Target-Oriented Kirchhoff Migration Method

Dzulkefli,

Abdul Latiff,

Hashim

et al. 2023

Applied Sciences

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A major challenge for the oil and gas industry is expediting the exploration geophysics activity. It is necessary to produce fast and accurate image of the targeted hydrocarbon reservoir, yet it involves extensive dataset due to the target location lies in deeper subsurface. Therefore, target-oriented oil and gas-reservoir imaging is currently seen as more attractive than conventional full-volume migration, in terms of computation efficiency. Through the integration of seismic redatuming with Kirchhoff migration, we presented a target-oriented imaging workflow that can effectively reduce computational cost while simultaneously enhancing the accuracy of the migrated image. Kirchhoff migration is renowned for being one of the simplest and flexible migration techniques, making it straightforward to implement. However, this migration approach is typically avoided in the presence of complex geology, as it tends to introduce artifacts in the images, thereby disrupting the interpretation beneath the complex overburden. Therefore, this paper highlighted the advantages of utilizing seismic redatuming to retrieve data beneath the overburden, followed by the utilization of the redatumed data as input for Kirchhoff migration. With an improved signal to noise ratio, the primary reflection events were amplified, providing clearer representation of the subsurface structure within the hydrocarbon reservoir or targeted area. Additionally, we utilized the benefits of Kirchhoff migration and explored the feasibility of performing patch-based migration in several areas of interest beneath the salt layer. This approach aimed to reduce both the turnaround time and the associated seismic migration costs. The developed workflow then was subsequently put to the test and applied to both a sub-salt SEG Advanced Modeling (SEAM) model and field data situated in East Malaysia. Based on the outcomes of the target-oriented migration, the proposed methodology demonstrated its capability to generate better quality and instant migrated images within the designated region. Furthermore, the feasibility of target-oriented imaging with Kirchhoff migration was substantiated through the integration of seismic redatuming, resulting in significant benefits towards seismic processing, imaging, and interpretation.

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Section: Introductionmentioning

confidence: 99%

Unveiling Accurate Seismic Imaging through the Advanced Target-Oriented Kirchhoff Migration Method

Dzulkefli,

Abdul Latiff,

Hashim

et al. 2023

Applied Sciences

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Full Wavefield Redatuming: Accurate Velocity Modelling for Imaging Beneath Complex Overburden

Dzulkefli

Xin

Ghazali

et al. 2021

Day 4 Fri, March 26, 2021

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Salt is known for having a generally low density and higher velocity compared with the surrounding rock layers which causes the energy to scatter once the seismic wavefield hits the salt body and relatively less energy is transmitted through the salt to the deeper subsurface. As a result, most of imaging approaches are unable to image the base of the salt and the reservoir below the salt. Even the velocity model building such as FWI often fails to illuminate the deeper parts of salt area. In this paper, we show that Full Wavefield Redatuming (FWR) is used to retrieved and enhance the seismic data below the salt area, leading to a better seismic image quality and allowing us to focus on updating the velocity in target area below the salt. However, this redatuming approach requires a good overburden velocity model to retrieved good redatumed data. Thus, by using synthetic SEAM model, our objective is to study on the accuracy of the overburden velocity model required for imaging beneath complex overburden. The results show that the kinematic components of wave propagation are preserved through redatuming even with heavily smoothed overburden velocity model.

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Characterization of Gas Clouds Using Non-linear Full Waveform Inversion

Cited by 2 publications

References 1 publication

Unveiling Accurate Seismic Imaging through the Advanced Target-Oriented Kirchhoff Migration Method

Unveiling Accurate Seismic Imaging through the Advanced Target-Oriented Kirchhoff Migration Method

Full Wavefield Redatuming: Accurate Velocity Modelling for Imaging Beneath Complex Overburden

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