3-D Focusing Transformation—Reliable Tool for Imaging Fractured Areas

Pozdnyakov, Vladimir A., Krasnoyarskgeofizika, Krasnoyarsk, Russia

Our previous experience of 2D seismic data processing of synthetic and real data by means of focusing transformations approved the possibility to eliminate some specific features of the geological medium under consideration, especially fractured and cracked areas. So, the next step naturally should be 3D data processing of the real field data. The paper presents results those were gained on the test-site situated on the south of the Krasnoyarsk area. This test-site is in action for a recent 3 years and is studied rather well by the range of geophysical methods (seismics, gravics, magnetotelluric and some oth­ers). Its the most significant feature is the near-surface presence of bazalt intrusion fol­lowed by the rather complicated upper part of the cross-section. The interior of this intru­sion is not homogeneous itself and possesses a lot of fractures and cracks. The very important question for a range of geological problems is to map correctly the spatial dis­position of these areas (for example when one deals with the problem of industrial waste disposal). The results presented in the paper demonstrate the possibility to do this by means of 3D focusing transformation. The specific fracture was spatially followed and traced for hundreds meters. It should be noted that initially this fracture was revealed by means of 2D focusing transformation.