CHARACTRISTICS OF SESMIC SEQUENCES IN THE EAST CHINA SEA SHELF BASIN AND THEIR GEOLOGICAL ATTRIBUTES
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摘要: 应用SYNTRAK-480型高分辨率数字地震仪对东海陆架盆地地层进行了探测研究。通过全区地震资料的解释,根据地震反射波及反射界面特征,共识别出T20、T30、T40、T50、T60和Tg等6个反射界面。重点对T20、T40、T50、T60和Tg反射层进行追踪对比解释,建立了统一的地震层序和地层格架。依据地震层序划分原则和方法,自上而下将基底反射界面以上的地震反射层划分为5个地震层序,即:Ⅰ(海底面-T20)、Ⅱ(T20-T50)、Ⅲ(T50-T60)、Ⅳ(T60-Tg)、Ⅴ(Tg以下)层序;其中第二地震层序可以进一部划分为两个亚地震层序Ⅱ1、Ⅱ2,经与研究区相邻海陆已知地质资料的对比分析,确定了该区5个不同地震层序的地质年代分别为Q+N、E3+E2+E1、K、J、前中生界。中生界沉积为有利勘探目的层,尤其是闽江凹陷与基隆凹陷潜力大,为油气勘探的重点区。Abstract: 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 Tg 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-Tg) andⅤ(Tg-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.
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