Method for 3D modelling of the impedance of a heterogeneous medium
US6374201B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1998 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Jul 2, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for 3D modeling of the impedance of a heterogeneous medium from recorded data corresponding to waves coming from the heterogeneous medium (such as a subsoil zone), in response to (for example elastic or electromagnetic) waves transmitted therein, and from an a priori 3D model of this heterogeneous medium, knowing the position of various impedance discontinuities of the medium, and after stratigraphic interpretation is disclose. The method comprises constructing a 3D geometric model comprising several foliated volumes (such as sedimentary units foliated by the deposition isochrones) with definition of the different sheets, constructing an a priori impedance model from this geometric model and from a plurality of impedance measurements taken at various depths of the heterogeneous medium (in a well for example), selecting a covariance model (exponential for example) along the sheets of the foliated volumes, and forming the optimum model by recorded data inversion using the a priori impedance model. The method can be used notably for studying the configuration of hydrocarbon reservoirs for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.