Methods and systems for performing azimuthal simultaneous elastic inversion

摘要

An improved method for analyzing seismic data to obtain elastic attributes is disclosed. In one embodiment, a reflectivity series is determined for at least one seismic trace of seismic data obtained for a subterranean formation, where the reflectivity series includes anisotropy properties of a formation. One or more synthetic seismic traces are obtained by convolving the reflectivity series with a source wavelet. The one or more synthetic seismic traces are inverted to obtain elastic parameters estimates. According to one aspect, the data inputs are angle-azimuth stacks. According to another aspect, the data inputs are azimuthal Fourier coefficients, un, vn.

主权项

1. A method for performing azimuthal simultaneous elastic inversion of seismic data of a subterranean formation, the method comprising:
forward modeling including
determining a HTI stiffness matrix from the seismic data, using parameterization, for at least one azimuth and at least one angle of incidence from said seismic data, wherein the HTI stiffness matrix varies spatially with respect to one or more layers, applying a Bond transformation to the HTI stiffness matrix to rotate an isotropy symmetry plane to be referenced with respect to true North, and calculating a reflectivity series for the at least one azimuth angle and the at least one angle of incidence using one or more reflection coefficients, wherein anisotropy media is incorporated; and determining parameters to be used by the parameterization in a next iteration, wherein the forward modeling and the determining of the parameters are performed iteratively using a central processing unit of a computer.