CAJ | 학술논문

线状陆架沙脊一直是海洋地质学和沉积学研究的热点。基于东海近海底1700 km2的三维地震数据，对陆架沙脊开展地震地貌学、沉积构型、成因和演化研究，并取得以下3点认识：（1）研究区发育7条NW-SE向陆架沙脊体系，海底呈槽脊相间地形特征。沙脊表面发育NE-SW向沙波体系。脊1、脊2、脊4和脊6表现为2～3条交叉或合并的沙脊体系，而脊3、脊5和脊7呈现为独立沙脊体系。（2）线状陆架沙脊横剖面左右不对称，宽2～11 km，脊高3～31 m，坡面相对较缓，倾角大多小于1°。（3）研究区水深变化和近海底潮流速度等因素指示研究区沙脊处于活动沙脊和衰亡沙脊的过渡阶段。研究第四纪陆架沙脊对沙脊储层的预测具有一定的指导意义。
선상륙가사척일직시해양지질학화침적학연구적열점。기우동해근해저1700 km2적삼유지진수거，대륙가사척개전지진지모학、침적구형、성인화연화연구，병취득이하3점인식：（1）연구구발육7조NW-SE향륙가사척체계，해저정조척상간지형특정。사척표면발육NE-SW향사파체계。척1、척2、척4화척6표현위2～3조교차혹합병적사척체계，이척3、척5화척7정현위독립사척체계。（2）선상륙가사척횡부면좌우불대칭，관2～11 km，척고3～31 m，파면상대교완，경각대다소우1°。（3）연구구수심변화화근해저조류속도등인소지시연구구사척처우활동사척화쇠망사척적과도계단。연구제사기륙가사척대사척저층적예측구유일정적지도의의。
The study on linear shelf sand ridges is always a hot topic in the field of marine geology and sedim-entology.On the base of near-seafloor 3 D seismic data which covers an area of 1 700 km2 ,the seismic geomor-phology,sedimentary architecture,genesis and evolution of the shelf sand ridges were discussed in this paper. The following conclusions have been drawn from this study:(1 )7 NW-SE oriented shelf sand ridge systems have developed in this study area.The seafloor in the study area is characterized by a ridge-and-swale topogra-phy.Sand waves oriented NE-SW have been observed in the surface of the sand ridges.The ridge 1 ,ridge 2, ridge 4 and ridge 6 were composed of 2 to 3 cross-combining sand ridges.While the ridge 3 ,ridge 5 and ridge 7 were revealed as a single sand ridge in the study area.(2)The linear sand shelf ridges are asymmetric in cross section and are oriented parallel to the current direction.The sand ridges have a length between 2 km and 1 1 km.Their heights are from 3 m to 3 1 m.The angle of dip of the slope is mostly less than 1 °.(3 )In this study area,the stage of the sand ridges between active sand ridge and moribund sand ridge have been indicated by the change of water depth and the velocity of tidal current.Investigation of sand ridges on the Quaternary shelf is of critical importance for predicting tidal sand reservoirs.