Fracture detection in the Manderson Field: A 3D AVAZ case history

Gray, David; Head, Kim

doi:10.1190/1.1815667

Cited by 12 publications

(2 citation statements)

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“…Based on observations in the gently folded Greybull Platform, the 140° fracture set may be present as fracture swarms throughout the basin. This is supported by the fracture studies of Gray and Head (2000), which compared fractures in outcrop with those inferred from seismic data and observed in drill core in the Manderson Field and Zeisman Dome (SE of Manderson Field), which are located south of the present study areas. Results of Gray and Head (2000) show consistency of fracture orientations (NW-SE, 85°, and 160°) between outcrop and subsurface (seismic and core study), and support the contention that the 90°,165°, and 140° sets observed in Mowry Shale outcrops are also present in Mowry Shale in the basin.…”

Section: Natural Fractures In Mowry Shale Outcrops As a Subsurface Resupporting

confidence: 85%

Natural fracture systems in Mowry Shale outcrops, Bighorn Basin, Wyoming

Zhang¹

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Section: Natural Fractures In Mowry Shale Outcrops As a Subsurface Resupporting

confidence: 85%

Natural fracture systems in Mowry Shale outcrops, Bighorn Basin, Wyoming

Zhang¹

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“…In recent years, methods for the remote detection of fractures using P-wave data sets have been of considerable interest to the community (Lynn et al, 1995;Mallick et al, 1998;Ramos and Davis, 1997;Gray and Head, 2000). A popular approach is to analyze amplitude variation with offset and azimuth (AVAz) in the CDP domain from which a super bin made of several CDP stack bins is built to collect a large number of seismic traces to obtain an acceptable coverage of azimuth and offset.…”

Section: Introductionmentioning

confidence: 99%

Imaging fractures and faults from 3‐D VSP(s)

Luo

Evans

2002

SEG Technical Program Expanded Abstracts 2002

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A 3-D VSP survey surrounding a well generally offers a good coverage of azimuths and offsets in shot domain, thus providing a rather ideal environment for fracture and fault detection. We demonstrate the potential of using 3-D VSP data to detect fractures and faults through physical modeling. The result of this research work is that a lineation or trend within a multi-azimuthal seismic attribute plot is a direct indication of the presence of fracturing or faulting.

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Numerical experiments of fracture-induced velocity and attenuation anisotropy

Carcione

Picotti

Santos

2012

Geophysical Journal International

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SUMMARY Fractures are common in the Earth’s crust due to different factors, for instance, tectonic stresses and natural or artificial hydraulic fracturing caused by a pressurized fluid. A dense set of fractures behaves as an effective long‐wavelength anisotropic medium, leading to azimuthally varying velocity and attenuation of seismic waves. Effective in this case means that the predominant wavelength is much longer than the fracture spacing. Here, fractures are represented by surface discontinuities in the displacement u and particle velocity v as , where the brackets denote the discontinuity across the surface, is a fracture stiffness and is a fracture viscosity. We consider an isotropic background medium, where a set of fractures are embedded. There exists an analytical solution—with five stiffness components—for equispaced plane fractures and an homogeneous background medium. The theory predicts that the equivalent medium is transversely isotropic and viscoelastic. We then perform harmonic numerical experiments to compute the stiffness components as a function of frequency, by using a Galerkin finite‐element procedure, and obtain the complex velocities of the medium as a function of frequency and propagation direction, which provide the phase velocities, energy velocities (wavefronts) and quality factors. The algorithm is tested with the analytical solution and then used to obtain the stiffness components for general heterogeneous cases, where fractal variations of the fracture compliances and background stiffnesses are considered.

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Fracture detection in the Manderson Field: A 3D AVAZ case history

Cited by 12 publications

References 2 publications

Natural fracture systems in Mowry Shale outcrops, Bighorn Basin, Wyoming

Natural fracture systems in Mowry Shale outcrops, Bighorn Basin, Wyoming

Imaging fractures and faults from 3‐D VSP(s)

Numerical experiments of fracture-induced velocity and attenuation anisotropy

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