Method for vertical seismic profiling
US5148407A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Oct 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/161
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method of vertical seismic profiling in drilling operations utilizing the drill bit for a source of seismic energy without any break in drilling operations. The noise of the drill bit and reflections of the noise in the formation are recorded with the aid of a geometrically extended array of receivers which are provided in a predetermined matrix group. The received signals are analyzed according to velocity and migration principles per se on the basis of differences in reception times, by which the noise signature of the drill bit can be determined at any desired location during drilling operations and extracted from the traces. The remaining received signal frequencies and signal amplitudes are analyzed in relation to their deviation in time, the signals being grouped according to time differences corresponding to focusing on certain areas in the formation. Preferably, the method comprises the steps of gathering data from seismic traces with a plurality of receivers forming an array on the earth surface, performing velocity analysis on the seismic traces to obtain a velocity of the earth formation and to apply moveout corrections to each of the traces gathered by the plurality of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.