Some Sources of Distortion in Tomographic Velocity IMAGES1

摘要: Two particular sources of distortion, which may be encountered when applying tomographic imaging techniques to crosshole seismic data, have been investigated. Errors in survey locations the shots and receivers can produce significant distortions images obtained. A simple method for solving simultaneously velocity field shot receiver location errors is presented applied synthetic real data. Reflection refraction rays at interfaces poor density angular coverage within region interest. It shown that effect on ray significantly affect resolution image, even if bending taken into account. One consequence this that, some cases, little improvement image quality achieved by using curvi-ray rather than straight-ray inversion techniques, despite occurrence pronounced bending.