Using three methods,namely the comprehensive plane diagram method, the coordinate method and the Z ?transform formula method, the authors have summed up the computation technique for the lateral fold number and Common Depth Point distance in the 3?D observation system.

Prestack amplitude normalization processing based on fold and its application to Daqing Oilfield;

Briefly analyzing relationship between folds and S/N ratio.;

In such a design, the main problems to be solved are:1) the definition of the center position for shots spread,2) the effect of shots missing on coverage area and fold,and 3) the arrangement of shots and receivers f.

In view of the problems existed in traditional formula computing bin size and folds, the paper redefined the conception of bin and presented new computation formula, making the computation formula have wider usage scope.

Some quality problems resulted from different grid and uneven coverage in the data of each block with different surface conditions operated in different years.

There are several marine and land geometry merging methods,they are lateral merging method and longitudinal merging method;geophone line overlapping、shot-point consecutive joining method and shot-point consecutive merging method;full coverage zone merging method and transitional zone merging method.