Can hydrocarbon saturation be estimated using density contrast parameter?

Kabir, Nurul; Crider, Richard; Xia, Ganyuan

doi:10.3997/2214-4609.201405211

Cited by 7 publications

(1 citation statement)

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“…However, the estimation of Young's impedance attribute from surface seismic data is quite arduous and unstable due to the requirements of the information of large incident angles or offsets (Downton ; Kabir et al . ). In this paper, we derive a linearized PP‐wave reflection coefficient in terms of Young's impedance and perform the direct inversion for Young's impedance to reduce the accumulated errors caused by the indirect estimation.…”

Section: Introductionmentioning

confidence: 97%

Amplitude variation with incident angle and azimuth inversion for Young's impedance, Poisson's ratio and fracture weaknesses in shale gas reservoirs

Pan

Zhang

2019

Geophysical Prospecting

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By analogy with P‐ and S‐wave impedances, the product of Young's modulus and density can be termed as Young's impedance, which indicates the rock lithology and brittleness of unconventional hydrocarbon reservoirs. Poisson's ratio is also an effective indicator of rock brittleness and fluid property of unconventional reservoirs, and fracture weaknesses indicate the fracture properties (fracturing intensity and fracture fillings) in fracture‐induced unconventional reservoirs. We aim to simultaneously estimate the Young's impedance, Poisson's ratio and fracture weaknesses from wide‐azimuth surface seismic data in a fracture‐induced shale gas reservoir, and use the horizontal transversely isotropic model to characterize the fractures. First, the linearized PP‐wave reflection coefficient in terms of Young's impedance, Poisson's ratio, density and fracture weaknesses is derived for the case of a weak‐contrast interface separating two weakly horizontal transversely isotropic media. In addition, an orthorhombic anisotropic case is also discussed in this paper. Then a Bayesian amplitude variation with incident angle and azimuth scheme with a model constraint is used to stably estimate Young's impedance, Poisson's ratio and fracture weaknesses with only PP‐wave azimuthal seismic data. The proposed approach is finally demonstrated on both synthetic and real data sets with reasonable results.

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Section: Introductionmentioning

confidence: 97%