Aiming at the dolomitic limestone fractured reservoir in the northwestern margin of Junggar Basin, a series of the fractural detection methods are adopted, including the edge detection based on wavelet multi-scale product, generalized Hilbert transform and curvature analysis. The result shows that these methods are of high horizontal resolution and anti-noise ability. Applied to the first member of Fengcheng formation in Wuerhe-Xiazijie fault belt and by correlation analysis to regional structural characteristics and drilling/well data, it is indicated that these methods are applicable for this area.