The Potential of Estimating Fracture Sizes from the Frequency Dependence of Anisotropy

Maultzsch, S.; Chapman, Mark; Liu, E.

doi:10.3997/2214-4609-pdb.6.c24

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2003

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“…Our hypothesis is that frequency dependent anisotropic effects can be used to deduce an average fracture size from seismic data. This concept is based on a previous study from a tight gas reservoir in the Uinta basin, where we could successfully discriminate between the effects of fractures at a metre scale and micro-cracks from multi-component VSP data (Maultzsch et al, 2003). 53 source locations were chosen to acquire the 9-C VSP data in the San Juan Basin.…”

Section: Introductionmentioning

confidence: 99%

Shear-Wave Splitting Analysis of a 3D VSP from the San Juan Basin

Maultzsch¹,

Liu²,

Li³

et al. 2003

65th EAGE Conference &Amp; Exhibition

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A quantitative characterization of fracture properties in naturally fractured tight gas reservoirs is of great importance for understanding reservoir properties. This study presents the analysis of a 3D-VSP data set from the San Juan Basin with regard to shear-wave anisotropy. The results indicate heterogeneity in the fracture distribution at the reservoir level. Overall, the time delays between split shear waves at reservoir depths are relatively small. This may be due to the presence of several fracture orientations in the target.

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Section: Introductionmentioning

confidence: 99%