Methods and apparatus for subsurface geophysical exploration using joint inversion of steady-state and transient data
US7504829B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 2006 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Aug 16, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatus are provided for controlled source electromagnetic surveying. In particular, a time-varying electromagnetic signal is transmitted at a first location, and an electromagnetic signal responsive to the transmitted signal is received at a second location, wherein the received signal includes a transient response component and a steady-state component. The received signal is continuously recorded during a predetermined time interval, and data corresponding to the transient response component and the steady-state component are extracted from the received signal. The transient response data and the steady-state response data are jointly inverted to identify a subsurface feature, such as resistivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.