Subsurface electrical conductivity contrast reconstruction using narrow-band electromagnetic data and fullwave imaging
US8447521B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2010 |
| Grant date | May 21, 2013 |
| Priority date | — |
| Expiry date | Jun 3, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and related systems are described for analyzing electromagnetic survey data. Electromagnetic survey data of a subterranean formation is obtained using at least a downhole transceiver deployed in a borehole and a transceiver positioned on the surface or in another borehole. The electromagnetic survey data includes an incident wave component and a scattered wave component. The incident and scattered components are correlated so as to generate an image of the subterranean formation indicating spatial locations of one or more features, for example, electrical properties such as resistivity variations, in the formation. The image is based at least in part on one or more interference patterns of the incident and scattered wave components. The correlation preferably includes generating a simulation of the incident wave component propagated into the formation, and convolving the simulated propagated incident wave component with the scattered wave component. The simulation can be performed using an analytic continuation or a fullwave simulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.