Application of Prestack Depth Migration in Chengbei 30 Area

The Chengbei 30 buried hill locates in the east of the major part of Chengdao oil field in Shengli exploration area in which Paleozoic and Archaean formation are the two main formation of interest. Because the buried hill strata have experienced structural movement in different geologic period, the faults cut and intersected together which resulted in very complicated internal structure. These cause ordinary seismic section unable to image the buried hill strata correctly. Based on the comprehensive geologic research and VSP log data, an accurate model of velocity has been established with the prestack depth migration technology. Wavelet is extracted from different formations of interest, sy nthetic seismogram is made, formations are demarcate accurately, and the faults of various scale and directions are fitted together based on the comprehensive geologic research. Finally, the character of structure is made clear through fine interpretation. Application of the method in the ex plo ration and exploitation of Chengdao area shows good result.