Characterizing fracture orientations in orthorhombic adjacent layers using the phase of azimuthal fourier coefficients
AssigneeCgg Services SAS
InventorBenjamin ROURE
Life of this patent
Estimating the term…
Abstract
Methods and apparatuses characterize fracture orientations in orthorhombic adjacent layer. Seismic data with azimuthal coverage enables calculating Fourier coefficients of reflectivity at an interface between the orthorhombic adjacent layers. The phases of 2nd and 4th FCs may be used to infer the fracture orientations in the orthorhombic adjacent layers. Analysis of 2nd and 4th Fourier coefficients' phases for different incidence angles may indicate that the fracture orientations in the orthorhombic adjacent layers are aligned, orthogonal, at 45°, that one of the layers is isotropic, etc.
Claims20
A seismic exploration method characterizing fracture orientations in orthorhombic adjacent layers, the method comprising:
- obtaining seismic data with azimuthal coverage enabling calculating azimuthal Fourier Coefficients, FCs, of reflectivity at an interface between the orthorhombic adjacent layers;
- calculating phases of 2nd and 4th azimuthal FCs for different incidence angles;
- and
- characterizing the fracture orientations in the orthorhombic adjacent layers based on the phases of 2nd and 4th azimuthal FCs, for a drilling and/or fracking plan.
A seismic data processing apparatus, comprising:
- an interface configured to obtain seismic data with azimuthal coverage enabling calculating azimuthal Fourier Coefficients, FCs, of reflectivity at an interface between the orthorhombic adjacent layers;
- and
- a data processing unit connected to the interface and configured
- to calculate phases of 2nd and 4th azimuthal FCs for different incidence angles;
- and
- to characterize the fracture orientations in the orthorhombic adjacent layers based on the phases of 2nd and 4th azimuthal FCs, for a drilling and/or fracking plan.
A computer readable recording medium non-transitorily storing executable codes that when executed by a computer make computer perform a method for characterizing fracture orientations in orthorhombic adjacent layers, the method comprising:
- obtaining seismic data with azimuthal coverage enabling calculating azimuthal Fourier Coefficients, FCs, of reflectivity at an interface between the orthorhombic adjacent layers;
- calculating phases of 2nd and 4th azimuthal FCs for different incidence angles;
- and
- characterizing the fracture orientations in the orthorhombic adjacent layers based on the phases of 2nd and 4th azimuthal FCs, for a drilling and/or fracking plan.
Dependencies are inferred from the claim text.