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利用黄海海区重磁观测数据,以最新的地震层析成像和浅层反射地震探测结果作为约束,并利用小波分解、纹理特征图像处理等手段,对研究区进行了地球物理场特征分析、岩石物性总结、断裂信息提取和磁性基底埋深反演计算,同时对南黄海海域三条剖面进行了广义逆重磁数据拟合反演和地震P波速度成像.根据地球物理数据的各种处理结果,提出在南黄海西部存在一条串珠状地球物理线性构造带,并将这条NNW向断续延伸的构造带称之为南黄海西缘断裂带.该断裂带延伸长,断裂两侧前新生代地层差异较大,有可能是造成陆区和南黄海南部盆地区前新生代油气远景差异的原因之一.文中得到南黄海磁性基底埋藏分布具有“中间浅四周深”的分布特征,与地震层析成像结果相吻合.磁性基底的局部起伏和局部构造的边界断层共同控制了前新生代残留盆地的格架和残余厚度分布,反映出“区域控制局部,深层约束浅层”的规律.
Using the gravity and magnetic data from the Huanghai Sea area, the latest seismic tomography and shallow reflection seismic exploration results are taken as constraints. The characteristics of the geophysical field are analyzed using wavelet decomposition and texture feature image processing. The petrophysical properties Summarizing, extracting fracture information and calculating the buried depth of magnetic substrate, meanwhile, generalized reversed-gravity-magnetic data fitting inversion and seismic P-wave velocity imaging are carried out on three sections of the South Yellow Sea.According to various processing results of geophysical data, A beaded geophysical linear tectonic belt exists in the western part of the southern South Yellow Sea, and this NNW tectonism extending intermittently is called the southern Yellow Sea western margin fault zone. The fault zone is elongated and pre-Cenozoic stratigraphic differences on both sides of the fault Which may be one of the reasons leading to the difference of the fore-Cenozoic hydrocarbon potential between the continental margin and the southern basin of the southern Yellow Sea.It is found that the distribution distribution of the southern Huanghai seafloor has a distributional distribution of “shallow middle four weeks” The results of the imaging coincide.The local undulations of the magnetic substrate and the locally constructed boundary faults jointly control the framework and residual thickness of the Pre-Cenozoic residual basins Distribution, reflecting the “local control area, bound by deep shallow ” the law.