Abstract: CRS-OIS is a method for realizing common-reflection-surface (CRS) stack imaging from output traces imaging. The method is of big difference from traditional methods in the fact that it not only gives a high-quality stack profile, but also provides high-quality pre-stack gather. These are of well applied values for improvement of pre-stack imaging quality of data with low signal-to-noise ratio. The method is applied to the piedmont of the southern margin of Junggar basin and proves to be effective and feasible.

Key words: Junggar basin, southern margin, piedmont, low signal-to-noise ratio, common reflection surface, stacking