1887

Abstract

Summary

Frequency-dependence of anisotropy can be caused by physical properties of fractured porous rock and tuning effect. In this paper, we perform a synthetic study to talk about frequency-dependence of anisotropy induced by these two factors but we pay more attention to tuning effect. We use reflectivity method to generate azimuthal gathers for P-wave based on Chapman’s multi-scale rock physical model and use SPWVD to apply spectrum decomposition to compare characteristic of anisotropy for different frequency components. Based on the work, we find anisotropy intensity for a single fractured thin bed is constrained by thickness, the difference of energy and characteristic of azimuth anisotropy for the top and bottom interface reflections. Anisotropy intensity varies with frequency periodically, and the period is determined by thickness when the dominant frequency of the wavelet is a constant. Characteristic of frequency-dependent anisotropy induced by rock properties can be covered up by that of tuning effect. So we can’t neglect tuning effect when we try to use frequency-dependent azimuth anisotropy to describe fractured reservoirs.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201801065
2018-06-11
2020-07-11
Loading full text...

Full text loading...

References

  1. Chapman, M. and Liu, E.
    [2004] Frequency dependent azimuthal amplitude variations in reflections from a fractured layer. SEG Technical Program, Expanded Abstracts, 147–150.
    [Google Scholar]
  2. Fryer, G.J. and Frazer, L.N.
    [1984] Seismic waves in stratified anisotropic media. Geophysical Jour-nal of the Royal Astronomical Society, 78(3), 691–710.
    [Google Scholar]
  3. Fryer, G.J, and Frazer, L.N.
    [1987] Seismic waves in stratified anisotropic media - II. Elastodynamic eigensolutions for some anisotropic systems. Geophysical Journal of the Royal Astronomical Society, 91(1), 73–101.
    [Google Scholar]
  4. Liu, E. Maultzsch, S. Chapman, M. and Li, X.Y. [2003] Frequency-dependent seismic anisotropy and its implication for estimating fracture size in low porosity reservoirs. The Leading Edge, 22(7), 662–665.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201801065
Loading
/content/papers/10.3997/2214-4609.201801065
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error