Seismic 2D Reflection Processing and Interpretation of ... - Posiva

42some specified limiting value. This could have reduced noise and made the reflectorsclearer, but on the other hand decreased fold. Effective survey would apply longeroffsets to cover steeper reflector surfaces, and more fold in stacking.Processing and interpretation succeeded well because clear two-dimensional reflectorswere seen in processed data and corrected three-dimensional surfaces matched wellwith other data. Quality of the measured data was reasonably good. The obtained highfrequencies allowed good resolution of observations. Depth accuracy of convertedreflector events is of order of 10% of depth. According to results processing wasworthwhile to perform and results were got from the existing data with only theprocessing costs. Picked surfaces matched well with the borehole control data and 3Dsurvey results. Great advantage was to get information from the ONKALO site whereextensive surface seismic surveys may not be possible to perform any more.The line coverage 100 x 100 m seemed to be sparse to decide on same features onparallel lines. The crossline control of reflectors allowed detection of several 3Dsurfaces, which are limited in the area. More precise mapping of the subsurfacefeatures would require not only higher fold and offset in survey setup, but also denserline coverage, which demands will practically lead to a need for 3D reflection array.