Abstract：In order to solve the problem of poor quality of seismic data and poor imaging in the underlying fault of Xibei structure in Changzhou area, a two-dimensional Geological model was constructed by means of the DS1 well drilling and the pre-interpretation scheme. Based on the conventional observation system, simulation excitation and illumination analysis were carried out on the upper, middle, lower and side of the quicksand layer, and the illumination was extracted and the shadow region was determined along the target layer interface.According to the principle of the reciprocity of seismic waves, the receiving range of the superior energy of the sur-face was determined by reverse illumination analysis on both sides of the shadow region along the interface of the target layer. Illumination and images in the shadow region were improved by optimization of the acquisition parameters and effective simulation analysis within the superior receiving range. It proved that illumination analysis is feasible for optimization design of the acquisition parameters of the Xibei structure, and it can improve the quality of acquisition through the comparison and verification of the actual section.

Keyword：illumination analysis;Xibei structure;seismic acquisition;observation system;optimization design;