Full wavefield inversion with reflected seismic data starting from a poor velocity model
US10739480B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2018 |
| Grant date | Aug 11, 2020 |
| Priority date | — |
| Expiry date | Nov 24, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/675
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A computer-implemented method for updating subsurface models including: using an offset continuation approach to update the model, and at each stage defining a new objective function where a maximum offset for each stage is set, wherein the approach includes, performing a first stage iterative full wavefield inversion with near offset data, as the maximum offset, to obtain velocity and density or impedance models, performing subsequent stages of iterative full wavefield inversion, each generating updated models, relative to a previous stage, wherein the subsequent stages include incrementally expanding the maximum offset until ending at a full offset, wherein a last of the stages yields finally updated models, the subsequent stages use the updated models as starting models, and the full wavefield inversions include constraining scales of the velocity model updates at each stage of inversion as a function of velocity resolution; and using the finally updated models to prospect for hydrocarbons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.