北黄海西部晚第四纪浅层地震剖面层序分析

结合前人工作对北黄海西部7条浅层地震剖面测线进行解译，所揭示的晚第四纪U1-U4沉积单元的特征是：U1围绕山东半岛形成楔状沉积体，厚度从近岸地区的大于40m向海减薄到0m；U2平均厚度为15m，分布稳定，在研究区由东北向西南增厚；U3平均厚度为20m左右，西南薄，东北厚；U4只在部分剖面上有记录。测线显示，U2单元层中存在埋藏古河道，大部分被天然气充填，形成两条NE-SW向延伸的分支河道，初步认为其属于古黄河北支水系，位于全新世地层之下的晚更新世地层中，为黄河在晚更新世末期（15～9 kaBP）流经北黄海西部的产物。

INTERPRETING THE LATE QUATERNARY SHALLOW SEISMIC RECORD OF THE WESTERN PART OF THE NORTH YELLOW SEA

Based on the information on the stratigraphic units obtained by previous studies, 7 high-resolution seismic lines have been interpreted for the western part of the North Yellow Sea. Four seismic units (U1 to U4) from top to bottom that are formed during late Quaternary are identified: U1, which is distributed around the Shandong Peninsula in a wedge-shape, with a thickness of up to 40 m; U2, which is more stable than U1 with an average thickness of 15 m, being relatively thick in the northeast but thin in the southwest of the study area; U3, which is thicker in the northeast than in the southwest, with a mean thickness of around 20 m; and U4, which is present only in parts of seismic survey lines. Buried paleo-channels are seen in U2 along the profiles, with many being filled with shallow gas; the channels form two branches in NE-SW direction. These paleo-channels are believed to be the northern branches of the Paleo-Yellow River and formed at the end of late Quaternary (15~9 kaBP) when the Paleo-Yellow River flowed into the study area.