| 摘要 |
Method of analysing the structure of a medium by means of waves reflected by inner interfaces, comprises: (a) generating multiple coverage data represented by traces recorded at a reference level of a plurality of source-receiver pairs distributed asymmetrically with respect to a predetermined central point according to optimal quasi-focusing distributions wherein all reflected events of such traces correspond to the same common reflecting point on a reflecting interface; (b) correcting the recorded traces according to a time delay correction, called an optimal oblique spherical correction, depending on the time of registration of the central trace to, and on local parameters of wave propagation velocity Vo at the reference level, and of radius of curvature ro of the wavefront emitted by a fictitious source located at the common reflecting point and coming to the central point at an angle of entry beta o; (c) stacking the corrected recorded traces; (d) repeating the above for a plurality of predetermined common reflecting points to produce a plurality of the stacked traces; and (e) utilizing the stacked traces and parameters ro and beta o as a function of to for determining the structure of the medium. |
