Application of Full Wavefield Migration in Obtaining True Amplitude Below Gas Cloud

Zahir, M.H. Mad; Sahad, Salbiah Md; Ishak, M Anwar; Ghazali, A.R.

doi:10.2523/19094-ms

Cited by 2 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

Compensating the Effect of Shallow Gas Cloud for Seismic Time-to-Depth Conversion

Azmi

Zahir

Ishak

et al. 2020

Day 1 Mon, November 02, 2020

View full text Add to dashboard Cite

Shallow overburden, specifically gas cloud, will create velocity anomaly. The anomaly will make the events underneath to be disrupted, thus affecting the seismic reflectors. Velocity model build from the seismic with the existence of anomalies will give us an inaccurate velocity estimation. Velocity model is crucial for various processes and one of it is for time-to-depth conversion. Therefore, it is very critical to have an accurate velocity model in order to provide us actual subsurface structures and lead us to the true reservoir location. In this paper, we will explain on our proposed approach to condition the velocity model with gas cloud problem. The robustness of the method was tested by using different velocity models for time-to-depth conversion and the results were analyzed. The criteria of the best depth map are conformance with geological structures, accurate well tie with the existing well and minimal residual errors within acceptable range. From the study conducted, we have proved that the seismic velocity with gas cloud correction provides the best depth map with minimal residuals.

show abstract

Application of Full Wavefield Migration in Obtaining True Amplitude Below Gas Cloud

Cited by 2 publications

References 6 publications

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

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

Compensating the Effect of Shallow Gas Cloud for Seismic Time-to-Depth Conversion

Contact Info

Product

Resources

About