The method of acoustic autofocusing is a technique to estimate the wave field that originates from a virtual source inside of a medium, with little knowledge of the medium parameters, and with no receivers (nor sources) located inside of the medium. Herein we present the first autofocusing algorithm modified for elastic media. Our algorithm is based on the elastic version of the receiver-side wave field extrapolation step performed in certain wave-equation migration algorithms. The elastic autofocusing algorithm has similar requirements to the acoustic case, namely reflection data measure at an acquisition surface (e.g., the Earth's surface), as well as estimates of the direct arrivals from the subsurface virtual source to the acquisition surface. We use two numerical experiments in varying-density, constant velocity, lossless elastic media to examine the accuracy of the method.
|Original language||English (US)|
|Title of host publication||76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014|
|Publisher||EAGE Publishing BVfirstbreak@eage.org|
|Number of pages||5|
|State||Published - Jan 1 2014|