Abstarct: In this research, I used a new stacking technique — the Common-Offset Common-Reflection-Surface stack — with which one can transform two-dimensional prestack data into a particular CO section. The CO CRS stacking method is baxsed on concepts of the ZO CRS stack. This means the CO CRS stacking operator is macro-model independent and fully automatically determined by means of a coherency analysis. In contrast to conventional stacking methods, the CO CRS stack uses the full multi-coverage data volume in the stacking procedure as the CO CRS stacking operator is not restricted to specific gathers (as, e.g., the CMP stack). Consequently, many more traces compared to conventional stacking methods contribute to the stack. The five stacking parameters constituting the CO CRS stacking operator are wavefield attributes. Among a multitude of other important applications the attributes can be of help to construct the macro-velocity model. Another part of this thesis is consist in diffractions using CO-CRS traveltime. Therefor a state of the art operator named Common-Offset Common-Diffraction-Surface (CO CDS) has obtained which one can enhance the diffractions. This method leads to high-resolution imaging of complex structure such as faults, fractures or conflicting dips. This method also has all advantages of CO CRS. Consequently, seismic data set from NE of Iran, with complex structure was selected for processing with these methods. Result of the pre-stack depth migration of the CO-CRS and CO-CDS showed that they could resolve some of the ambiguities in final structural interpretation of the data. They could better image the boundary of the mud volcanoes and faults besides increasing the quality of the final section.