Abstract: Using the gravity and magnetic data with wide area and deep exploration depth, we use enhanced local phase boundary identification and optimization Euler deconvolution to get the structural distribution of the East China Sea shelf basin. The enhanced local phase boundary identification method is the ratio of function data of the first order and the second order horizontal derivatives, which can effectively balance the different depth of the geological body boundary response, and improve the resolution of the deep structure; the optimization of Euler deconvolution method can effectively reduce the interference of background anomaly to result in more accurate inversion results. The theoretical model shows that the enhanced local phase boundary identification method can be more accurate and clear, the optimized inversion results of Euler deconvolution method can be more accurate and convergent. The comprehensive use of enhanced local phase boundary identification and optimization Euler deconvolution method can accurately divide the distribution of the East China Sea continental shelf fault structure, which has important reference value for guiding regional oil and gas exploration.

Key words: East China Sea basin, local phase, Euler deconvolution, structure feature, oil and gas exploratio