Practical depth imaging strategy in the Middle East

Bloor, Robert; Nessim, Maurice; ElKady, Nabil

doi:10.1190/1.1437594

Cited by 2 publications

(3 citation statements)

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“…Compared to shallow-crustal seismic reflection profiles used in oil exploration, which can be validated using drill-hole data, lithospheric scale reflection profiles focusing on structures in the lower crust and the upper mantle and having lower signal-to-noise ratios do not have this advantage. The non-single-valued error of velocity-depth increases linearly with depth in shallow layers and squarely with depth in deep layers (Ross, 1994;Bloor et al, 1997). This means that the error between velocity and depth is significant when depth exceeds the maximum offset.…”

Section: Factors Of Psdmmentioning

confidence: 99%

Depth migration of crustal-scale seismic reflection profiles: A case study in the Bohai Bay basin

Deng

Li²,

Gao³

2023

Front. Earth Sci.

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The application of the pre-stack depth migration (PSDM) method using deep seismic reflection data is still a challenge. In this paper, a deep seismic reflection dataset collected from the Bohai Bay Basin is used to test the applicability of the pre-stack depth migration method. After improving the signal-to-noise ratio of the prestack gathers and building an accurate velocity model capturing lateral and vertical variations, a high-quality pre-stack depth migration profile is obtained. This profile shows detailed crustal structures and an undulating Moho. The depth difference between the east and west sides of the Moho imaged in the profile is about 6 km. The Moho is disrupted by several discontinuities. Compared with conventionally stacked time-migration profiles, the pre-stack depth migration profile provides a higher-resolution subsurface image with accurate depth information. Combining geological and geophysical data, the pre-stack depth migration profile reveals geologic structures responsible for crust thinning during the destruction of the North China Craton. The profile also provides more accurate depth domain information for further study of crust-mantle interaction in this area.

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Section: Factors Of Psdmmentioning

confidence: 99%

Depth migration of crustal-scale seismic reflection profiles: A case study in the Bohai Bay basin

Deng

Li²,

Gao³

2023

Front. Earth Sci.

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“…Building a velocity model is a highly interpretive procedure and requires flexibility as it is data driven (Kessler et al, 1995;Kim et al, 1996;Bloor et al, 1997;Fagin, 1988;Jones et al, 1998). The velocity distribution in the sub-surface is summarized by layers separated by the main velocity contrasts (Figure 6).…”

Section: Midyan Velocity Model Buildingmentioning

confidence: 99%

“…(3) experienced geoscientists to process and interpret seismic data. These methodologies are now mature, and software and computer resources are available to implement such an interpretive processing approach within a reasonable time-schedule (Schultz and LeNoble, 1996;Bloor et al, 1997;Fagin, 1998;Jones et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Depth Imaging Sub-salt Structures: A Case Study in the Midyan Peninsula (Red Sea)

Mougenot¹,

Al-Shakhis²

1999

GeoArabia

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In the Midyan Peninsula (onshore northern Red Sea, Saudi Arabia), the current prospective oil and gas exploration targets are sub-salt structures. In this region, conventional time-migrated seismic sections are distorted due to the presence of salt diapirs, faults, and related lateral velocity variations. As demonstrated in other sub-salt prospects (North Sea, Gulf of Suez, and Gulf of Mexico), pre-stack depth migration can remove these distortions and accurately focus the structural image. Depth migration, however, requires a model which includes both lateral and vertical velocity variations to compensate for ray bending. Building such a velocity model is an iterative process which involves integration of various time/depth processing and interpretation skills. A 2-D seismic line, crossing various extensional structures in the dip direction, is used to illustrate these depth-imaging techniques. At the location of the sub-salt prospect, the depth image is improved and the lateral position of the main fault is shifted by 345 meters. The resulting structural model has refined the target definition and well position. This imaging approach is compared with the different steps of the seismic processing/interpretation flow.

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Practical depth imaging strategy in the Middle East

Cited by 2 publications

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Depth migration of crustal-scale seismic reflection profiles: A case study in the Bohai Bay basin

Depth migration of crustal-scale seismic reflection profiles: A case study in the Bohai Bay basin

Depth Imaging Sub-salt Structures: A Case Study in the Midyan Peninsula (Red Sea)

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