CHARACTRISTICS OF SESMIC SEQUENCES IN THE EAST CHINA SEA SHELF BASIN AND THEIR GEOLOGICAL ATTRIBUTES

High resolution multi-channel seismic survey is a cost-efficient technique for geological exploration. We conducted high resolution multi-channel seismic survey with the SYNTRAK-480, and studied the stratigraphical sequences in the East China Sea Basin. Based on the characteristics of seismic reflection records retrieved from the multi-channel seismic data, 6 reflectors marked as T₂⁰,T₃⁰,T₄⁰,T₅⁰,T₆⁰ and T_g are recognized and 6 seismic sequences established by correlation. From the top to the bottom, they are Ⅰ(sea floor-T₂⁰), Ⅱ(T₂⁰-T₅⁰), Ⅲ(T₅⁰-T₆⁰), Ⅳ(T₆⁰-T_g) andⅤ(T_g-below), and the second sequence can be further divided to two subsequences, Ⅱ₁ and Ⅱ₂. Compared with the data from the adjacent sea and land areas, these seismic sequences are Q+N,E₃+E₂+ E₁,K,J and Pre-Mesozoic respectively in age. The Mesozoic deposit is a favorable oil and gas exploration target in this area, especially in the Minjiang sag and Keelung sag.