Patent ID: 8614929
Filing Date: 2013-12-24
Classification: G01V

Abstract:
1. A method of exploiting underground porous media by injection of a fluid or production of a fluid comprising: acquiring at least two sets of seismic data, from at least two seismic campaigns, performed at different times, by emission of seismic waves within the media; determining two sets of speeds of the seismic waves by inversion with a computer of the at least two sets of seismic data, and using a Hertz-Mindlin power law to link the speed of wave propagation to pore pressure using a Hertz coefficient of the power law, determining the Hertz coefficient by measurement of samples obtained from the media using waves of frequencies f1; adjusting the Hertz coefficient to account for a frequency difference between the waves of frequencies f1 and the seismic waves by using measurements of attenuation of the waves of the frequency f1 of the samples; determining for any point of the porous media a variation of the pore pressure by the power law using the adjusted Hertz coefficient and the sets of inverted data; determining a location of the fluid or a location of another fluid substituted within the porous media from the variations of the pore pressure; and monitoring exploitation of the underground porous media by determining the location of the fluid or the location of the another fluid in the porous medium.