| 摘要 |
<p>The invention concerns a seismic prospecting method which consists in emitting underground a compressional seismic wave and picking up with sensors seismic data having at least a shearing component and in processing the data corresponding to said shearing component to deduce therefrom an information concerning the underground geological structure. The invention is characterised in that the method consists in determining an estimate of the ratio (a), wherein vp and vs are real local speed values of compression and shearing, wherein l represents the underground depth co-ordinate, and wherein z is the value of said depth co-ordinate at the bottom surface of the last layer to be analysed, and by inverting the seismic data so as to deduce the local speed values of compression and shearing for said layer to be analysed, using a modelling process wherein said estimate is used for the first invariant parameter ηeff.</p> |
