In the mountainous coalmine area for complicated-surface,the correct big moveout static correction is an important step of processing 3D seimic's data.

Residual moveout correction by using phase replacement.;

The author expounded statics error especially most direct and most obvious statics error factors impact on high resolution coalfield prospecting.

The effect of different floating datum corrections was studied using theoretical model experiments, resulting in the conclusion that the velocity obtained after the floating datum correction with the minimum static correction errors depends on the velocity of the layer below the low velocity layer (LVL) lower boundary and is not related to topographic relief and LVL structure.

In MX area, Tarim basin,there are serious static mis ties between the seismic data collected in the early period of exploration and that in recent years because of the complex near surface conditions of desert.