Nonlinear electroseismic exploration
USRE41829E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2004 |
| Grant date | Oct 19, 2010 |
| Priority date | — |
| Expiry date | Aug 5, 2024 |
Classification
- Technology area (CPC —)General
Abstract
A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlated with a reference waveform, with both waveforms custom designed to minimize both correlation side lobes and interference from linear electroseismic effects. A waveform element is selected which may be sequenced by a binary or similar digital code embodying the desired custom design to generate an input sweep with the needed depth penetration and noise suppression. Correlation of the seismic response with the reference waveform in a data processing step mathematically aggregates the seismic response from the input sweep into a single wavelet. Preferred binary digital codes include prescribed variations of maximal length shift-register sequences. Also, an apparatus for generating the desired waveforms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.