Extended subspace method for cross-talk mitigation in multi-parameter inversion
US10459117B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2014 |
| Grant date | Oct 29, 2019 |
| Priority date | — |
| Expiry date | Aug 2, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V20/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An extended subspace method for inverting geophysical data to infer models for two or more subsurface physical properties, using gradients of an objective function as basis vectors for forming model updates. The extended set of basis vectors provides explicit mixing between gradient components corresponding to different medium parameters, for example P-wave velocity and an anisotropy parameter. In a preferred embodiment, off-diagonal elements of the mixing matrix may be scaled to adjust the degree of mixing between gradient components. Coefficients of the basis vector expansion are determined in a way that explicitly accounts for leakage or crosstalk between different physical parameters. The same extended subspace approach may be used to make further improvement to the model updates by incorporating well constraints, where well log data are available.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.