Estimation of Fracture Orientation, Offshore Abu Dhabi

Roberts, Gareth; Wombell, R.; Gray, David; Al-Shamsi, Ali; Suwaina, Omar; Ajlani, Ghiath; Ebed, A.; Alkaabi, Mai

doi:10.3997/2214-4609-pdb.15.o-10

Cited by 5 publications

(1 citation statement)

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“…Recent work has shown that open, fluid-filled, natural fractures can be detected in seismic data from Amplitude versus Angle and Azimuth (AVAZ) analysis of P-wave 3-D seismic data using Rüger's (1996) AVAZ equation to derive the anisotropic contribution to the AVO gradient and its orientation (e.g. Gray et al, 1999, Hall et al 2000, Roberts et al 2001, Gray et al, 2002). Rüger's anisotropic contribution to the AVO gradient (B ani ) is closely related to the seismic 'crack density' (Lynn et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Integrating seismic fracture analysis with migration

Zheng¹,

Gray²

2002

SEG Technical Program Expanded Abstracts 2002

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Fractures are small cracks that occur when brittle rock is stressed to the point where it breaks. Zones of high stress frequently occur where the rock is bent the most, and therefore in places where seismic migration is most likely to be needed. Consequently, it is often important to be able to integrate seismic fracture analysis with migration. Conventional pre-and post-stack migration methods are incapable of handling azimuthal variations in amplitude. However, they can be modified to do this, and then they can be used in positioning seismic fracture attributes. Some such time-migration methods are tested on a geologically complex data set over the Manderson Field in Wyoming, USA, for which well control for the fractures in the reservoir is available. All these migrations collapse zones of apparently high fracture intensity and move them closer to significant structural features, e.g. faults. The conclusion is that these migration methods can successfully move the fracture attributes to appropriate positions.

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Section: Introductionmentioning

confidence: 99%

Integrating seismic fracture analysis with migration

Zheng¹,

Gray²

2002

SEG Technical Program Expanded Abstracts 2002

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2. Wide-azimuth amplitude-variation-with-offset analysis of anisotropic fractured reservoirs

Rüger¹,

Gray

2014

Encyclopedia of Exploration Geophysics

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Application of common reflection surface (CRS) to velocity variation with azimuth (VVAz) inversion of the relatively narrow azimuth 3D seismic land data

2021

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The fracture direction and its intensity are critical properties related to hydrocarbon characterization and identification. Both these properties have an essential role in identifying the direction of hydrocarbon migration, determining the sweet spot area, and optimizing the drilling design. The velocity variation with azimuth (VVAz) is a well-known method to estimate the fracture direction and its intensity. This method is of widespread interest because it predicts the properties based on seismic data without any practical constraints. Despite this interest, the technique requires rich azimuth 3D seismic data in our case, which is rare. This study aims to apply regularization and interpolation by including the wave front attributes based on the Common Reflection Surface (CRS) method before the VVAz inversion. The motivation of using the CRS method is to enrich the current azimuth of the 3D seismic data and improve the S/N ratio. The synthetic and the real 3D seismic data are evaluated to examine the interpolation scheme of the proposed CRS method’s performance. Based on the evaluation of the 3D seismic data after regularization, the amplitude versus offset (AVO) phenomena, and the VVAz inversion results are relatively consistent (or matched) with the model. A similar result is found for the case of real 3D seismic data. A significant positive correlation between the fracture intensity of FMI and the real seismic data of about 0.9 is obtained. Therefore, CRS can be used as a regularization and interpolation method before the VVAz inversion of the relatively narrow azimuth 3D seismic data.

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Estimation of Fracture Orientation, Offshore Abu Dhabi

Cited by 5 publications

References 0 publications

Integrating seismic fracture analysis with migration

Integrating seismic fracture analysis with migration

2. Wide-azimuth amplitude-variation-with-offset analysis of anisotropic fractured reservoirs

Application of common reflection surface (CRS) to velocity variation with azimuth (VVAz) inversion of the relatively narrow azimuth 3D seismic land data

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