P-wave Seismic Azimuthal Anisotropy for Detection and Prediction of Fractures in a Middle Eastern Carbonate Reservoir

Zelewski, Gregg; Lu, Chih-Ping; Tsenn, Michael C.; Mitchell, John C.; DeGraff, James M.

doi:10.2523/iptc-13903-ms

Cited by 4 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, a kinematic indicator for fracture properties can usually be extracted from the first three anisotropic parameters. Compared with the kinematic method, the dynamic method based on the prestack amplitude relationship has made encouraging progress in fracture characterization with developments of anisotropic migration (Dong and Davidson, 2003;Sun et al, 2006Sun et al, , 2012cGray, 2008;Zelewski et al, 2009;Wang et al, 2013).…”

Section: Methods Of Kinematic and Dynamic Fracture Predictionmentioning

confidence: 99%

Full-azimuth anisotropic prestack time migration in the local-angle domain and its applications on fracture detection

Sun

2015

GEOPHYSICS

View full text Add to dashboard Cite

Considering that geologic structures disturb prestack amplitude relationships, anisotropic migration is thus advocated not only for extracting azimuth-preserved common image gathers (CIGs), but also for preserving fracture-induced amplitude responses. However, most conventional anisotropic migration methods are hindered by their inefficiency in either modeling azimuthal traveltime variations at large offsets or characterizing subsurface reflections. Given that prestack time migration is widely applied for most practical purposes, we began with reformulations on a quartic traveltime formula, through which a new set of anisotropic parameters was developed. Then, an anisotropic migration method was established in the localangle domain (LAD) for more reasonable uses of subsurface wavefield information. We also used a traveltime inversion scheme to estimate those anisotropic parameters required by anisotropic migration. Using this methodology on a physical model with a fracture medium, we derived better focused CIGs by thoroughly correcting the anisotropic effects of overburden. As a result, predicted properties of the fracture medium showed fewer interventions of geologic impacts. In a field example, a comprehensive study was performed on a deep carbonate reservoir to examine influences of different anisotropic migration algorithms on ultimate fracture prediction. Comparisons of the signal-to-noise ratio and agreements with formation microimage information reconfirmed the superiority of LAD anisotropic migration in recovering true properties of subsurface fractures, relative to routine methods (i.e., azimuth-sectored migration and anisotropic migration in the surface-offset domain).

show abstract

Section: Methods Of Kinematic and Dynamic Fracture Predictionmentioning

confidence: 99%

Full-azimuth anisotropic prestack time migration in the local-angle domain and its applications on fracture detection

Sun

2015

GEOPHYSICS

View full text Add to dashboard Cite

show abstract

P-wave fracture prediction algorithm using pre-stack data with limited azimuth distribution: A case study in the TZ45 area, Tarim Basin, China

et al. 2011

View full text Add to dashboard Cite

Fractured reservoirs always show anisotropic amplitude features, i.e. the refl ection amplitude of seismic waves varies with offset and azimuth (AVOZ). A noise attenuation fracture inversion algorithm is presented for fracture detection based on P-wave AVOZ. The conventional inversion method always fails when applied to limited azimuth data because of the existence of noise. In our inversion algorithm, special attention is paid to suppressing the noise during inversion, to overcome the limitation of the conventional inversion method on limited azimuth data. Numerical models are employed to illustrate the effectiveness of the method. The inversion algorithm is then applied to Tazhong 45 area fi eld data which is acquired under limited azimuth distribution. Compared with cores and fullbore formation microimage (FMI), the inverted results (fracture density and orientation) are reasonable, suggesting that the inversion algorithm is feasible for fracture prediction in the Tarim Basin. P-wave fracture prediction algorithm using pre-stack data with limited azimuth distribution: A case study in the TZ45 area,

show abstract

A new fracture detection method based on full-azimuth anisotropic migration and shaping regularization

Sun

2018

J. Geophys. Eng.

View full text Add to dashboard Cite

P-wave Seismic Azimuthal Anisotropy for Detection and Prediction of Fractures in a Middle Eastern Carbonate Reservoir

Cited by 4 publications

References 4 publications

Full-azimuth anisotropic prestack time migration in the local-angle domain and its applications on fracture detection

Full-azimuth anisotropic prestack time migration in the local-angle domain and its applications on fracture detection

P-wave fracture prediction algorithm using pre-stack data with limited azimuth distribution: A case study in the TZ45 area, Tarim Basin, China

A new fracture detection method based on full-azimuth anisotropic migration and shaping regularization

Contact Info

Product

Resources

About