A feasibility study for pore-pressure prediction using seismic velocities in the offshore Nile Delta, Egypt

Badri, Mohammed; Sayers, Colin M.; Awad, R.; Graziano, Ardenghi

doi:10.1190/1.1438487

Cited by 19 publications

(8 citation statements)

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“…The presence of young failures at the seafloor overlying deeper failures suggests continual overpressure generation that preconditions the slope for failure in this rapid sedimentation environment. For the Nile Delta, offshore Egypt, Badri et al [2000] show that velocity‐fluid pressure transforms successfully delineate different pore pressure regimes in this active hydrocarbon province, demonstrating the value of this approach in various water or hydrocarbon systems.…”

Section: Examples Of Overpressured Systemsmentioning

confidence: 86%

Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models

Dugan

Sheahan

2012

Reviews of Geophysics

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[1] Fluid pressure in excess of hydrostatic equilibrium, or overpressure, in offshore environments is a widespread phenomenon that contributes to the migration and storage of fluids, solutes, and energy and to the potential mechanical instability of these sediments. Overpressure exists in deep and shallow systems and is most likely to be found where low-permeability (<10 À16 m 2 ) layers have inhibited pore fluid escape or there have been large forcing mechanisms (e.g., rapid sedimentation, tectonic stressing, heating, and volume-creating reactions). The genesis and magnitude of overpressure can be controlled by physical processes (e.g., rapid sedimentation (>mm/yr), tectonic loading, and lateral fluid transfer) and thermal and chemical processes (e.g., aquathermal expansion, hydrocarbon generation, mineral diagenesis, and organic maturation). In systems where nearlithostatic overpressures are generated, potentially unstable sediments are created. Failures of these sediments can create large-scale natural disasters, generate fractures, and damage seafloor and subseafloor infrastructure. Detailed characterization of overpressured systems has been accomplished through geological and geotechnical analyses, including investigation of physical-mechanical properties (mainly porosity, consolidation state, and shear strength), inversion of geophysical data (e.g., compressional and/or shear velocities), measurement of in situ properties, and postevent analyses. Process-based models have been developed to explain the origin of overpressure in terms of rate of overpressure genesis. This allows identification of potentially unstable zones and assessment of the potential for failure. Future development in measurements and in coupling of models will lead to more accurate analysis and prediction of fluid pressure in offshore sediments, which in turn will facilitate better hazard analyses and will enable safer and more cost-effective offshore drilling practices and other offshore infrastructure development.Citation: Dugan, B., and T. C. Sheahan (2012), Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models, Rev. Geophys., 50, RG3001,

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Section: Examples Of Overpressured Systemsmentioning

confidence: 86%

Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models

Dugan

Sheahan

2012

Reviews of Geophysics

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“…The Oligocene to Early Miocene NW-SE trending faults were related to a huge uplift including basaltic extrusion. The studies of the overpressured sediments in the offshore Nile Delta illustrated that pore pressures are largely related to under compaction (Badri et al 2000). The Tertiary rocks are thin and sandy compared to the thicker and more shale-rich equivalent rocks in the more distal in the offshore areas of the Nile Delta (Nashaat 1998).…”

Section: Geological and Tectonic Settingsmentioning

confidence: 99%

Utilisation of GNSS and seismicity for monitoring crustal deformation of the Northern part of the Nile Delta, Egypt

Mohamed

AbuBakr

Awad

et al. 2020

NRIAG Journal of Astronomy and Geophysics

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“…The basis of this method is based on the premise that any physical change in formation effects on seismic wave properties. Seismic survey is usually done before the main drilling phase of the field, so this method is the only way whose results can be used in drilling phase (Badri et al 2000). Porosity and rock compaction are two parameters that control the subsurface seismic responses.…”

Section: Pore Pressure Estimation Using Seismic Surveymentioning

confidence: 99%

Pore pressure prediction using seismic velocity modeling: case study, Sefid-Zakhor gas field in Southern Iran

Bahmaei

Hosseini

2019

J Petrol Explor Prod Technol

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Pore pressure estimation is important for both exploration and drilling projects. During the exploration phase, a prediction of pore pressure can be used to evaluate exploration risk factors including the migration of formation fluids and seal integrity. To optimize drilling decisions and well planning in abnormal pressured areas, it is essential to carry out pore pressure predictions before drilling. Mud weight and fracture gradient are essential parameters to have wellbore stability, prevent blowout, lost circulation, kick, sand production and reservoir damages. Predrill pore pressure accurate prediction allows the appropriate mud weight to be selected and allows the casing program to be optimized, thus enabling safety by preventing wellbore collapse and economic drilling by reducing the cost. The goal of this study is to estimate pore pressure relation with subsurface velocity in the Sefid-Zakhor gas field. Manufactured sonic logs are modified using the check shot interval velocity of Sefid-Zakhor well No. 1. The final acoustic impedance model is converted to the velocity model by removing density. Finally, the velocity model is converted to pore pressure using Bowers (in: IADC/SPE drilling conference proceedings, 1995) relation. The results of the pore pressure model are validated by pore pressure data obtained by the MDT well test tool. Generally, the results show the normal trend for pore pressure in the area, except in the left side of the anticline in the 2D seismic section, because of tectonic uplifting.

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A feasibility study for pore-pressure prediction using seismic velocities in the offshore Nile Delta, Egypt

Cited by 19 publications

References 0 publications

Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models

Offshore sediment overpressures of passive margins: Mechanisms, measurement, and models

Utilisation of GNSS and seismicity for monitoring crustal deformation of the Northern part of the Nile Delta, Egypt

Pore pressure prediction using seismic velocity modeling: case study, Sefid-Zakhor gas field in Southern Iran

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