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.
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