Method for interpreting repetitive seismic data considering seismic frequency band in the evaluation of pore pressures
US8614929B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2010 |
| Grant date | Dec 24, 2013 |
| Priority date | — |
| Expiry date | Mar 7, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/368
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for exploiting underground porous media via injection or production of a fluid is disclosed, wherein repetitive seismic records are interpreted taking into consideration the seismic frequency band in the evaluation of pore pressures. After inversion of 4D seismic data, at least two sets of seismic speeds are available which correspond to different moments in time. A Hertz-type power-law is then used to evaluate pore pressures, wherein the Hertz coefficient is determined using laboratory ultrasound or sonic measures. Then the coefficients are adjusted using a measurement of the attenuation of the ultrasound or sonic waves. Fluid flow is then monitored within the porous media by determining whether variation in seismic speed is due to the variation of pore pressure or to fluid substitution, using the adjusted Hertz equation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.