关于黄海深部构造的地球物理认识  

Geophysical understandings on deep structure in Yellow Sea

作　　者：郝天珧[1] 黄松[1] 徐亚[1] 李志伟[1] 张丽莉[1] 王家林[2] Suh Mancheol Kim Kwangkee 

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院油气资源研究重点实验室,北京100029 [2]同济大学海洋与地球科学学院,上海200092 [3]Kongju National University,314-710,Korea [4]Korea Ocean Research Institute,Korea

出　　处：《地球物理学报》2010年第6期1315-1326,共12页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(90814011,40674046,40620140435);国家高技术研究发展计划(863)(2006AA09Z359,2006AA12Z116)联合资助

摘　　要：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.Basing on gravity and magnetic data, the wavelet and textural analysis methods are used to analysis the geophysical field features, extract faults information, and calculate magnetic basement in Yellow Sea.Results of new seismic tomography and shallow reflection seismic soundings are taken as the constraint,and three gravity and magnetic profiles are inversed by using generalized method. According to the processing results,we propose that there is a beaded geophysical linear belt in western South Yellow Sea.The belt is NNW trending and we name it South Yellow Sea west marginal fault zone. This fault zone has large extension length and there is great difference in pre-Cenozoic strata of the two sides. It may be the reason why pre-Cenozoic petroleum prospect is different between the land and southern South Yellow Sea Basin. Magnetic basement distribution of Yellow Sea is shallow in the middle,while is deep around, which is consistent with the seismic tomography results. The pre-Cenozoic macro-distribution of residual basin is controlled by local relief of magnetic basement and boundary faults of local structure jointly, which reflects the regularity that local tectonics is controlled by regional tectonics, and shallow structures is controlled by deep structures.

关 键 词：重磁拟合 地震层析成像 南黄海 磁性基底分布 前新生代油气 

分 类 号：P738[天文地球—海洋地质] P541[天文地球—海洋科学]