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南黄海中的南HEUKSAN盆地是一个介于矩形到菱形之间、大小大致为32km×13km的盆地.这个盆地有两个最厚的沉积中心;一个在盆地西部中央,地震双程到时2.2s的部位;另一个在盆地东部中央位置.二者之间以中央隆起相隔.盆地的地震剖面可以进一步划分为古生代到三叠纪时期的前地堑相沉积,新生代的地堑充填沉积及中新世到上新世时期的的内凹沉积.地堑充填时期的沉积可以分为两个地震层序A和B.层序A和B又可以进一步划分为3到4个亚层序.在南HEUKSAN盆地利用地震层序学的方法对上始新统地震剖面进行了较为详细的分析.认为古水流大部分是从盆地的西部流入的.因此推断其沉积物源主要来自西北部地区,其次来自于盆地的北部.顶积层为三角洲相.根据反射地震剖面的连续性、振幅和反射频率等在上始新统的地震剖面上划分出4个地震相带.地震相A区主要位于两大沉积中心部位.为三角洲前缘泥砂.相带B位于沉积区的西北边缘为平坦三角洲的沙砾.相带C2沿着南部的盆地边缘断裂带分布,为冲积扇.结论认为:始新统的地震解释剖面表明当时主要为三角洲沉积.主要沉积物来自西北的陆源区和南HEUKSAN盆地的西北部.在盆地的南部边缘,沿着盆地的边界断层发育有冲积扇的沉积环境.
The southern HEUKSAN basin in the southern Yellow Sea is a basin of approximately 32 km x 13 km, with a size of approximately 32 km × 13 km. The basin has two thickest sedimentary centers; one is in the middle of the western part of the basin, And the other in the central part of the eastern part of the basin, separated by a central uplift.The seismic profiles of the basin can be further divided into pre-graben facies depositions from the Paleozoic to Triassic ages, filling and sedimentation of the Cenozoic graben, Neoproterozoic to Pliocene Depression Sedimentation during the graben filling period can be divided into two seismic sequences A and B. Sequences A and B can be further divided into 3 to 4 sub-sequences. The South HEUKSAN basin made use of the seismic sequence method to analyze the Upper Eocene seismic section in detail, and thinks that the paleocurrent flows mostly from the western part of the basin, so it is inferred that the sedimentary source mainly comes from the northwestern part, and secondly From the northern part of the basin.The top-lamellae are delta facies.According to the continuity, amplitude and reflection frequency of the reflection seismic profile, four seismic facies are divided in the seismic profile of the Upper Paleocene.The seismic facies A is mainly located in two Great heavy The center of the plot is the delta front sands, and the belt B is located on the northwestern margin of the sedimentary zone as the gravel of the flat delta.The facies belt C2 distributes along the southern margin of the basin as an alluvial fan.It is concluded that the Eocene earthquake The interpretation of the profiles showed that the area was predominantly deltaic at that time, with the main sediments coming from the terrestrial areas in the northwest and the northwestern HEUKSAN basin, where alluvial fan depositional environments developed along the boundary faults in the basin.