Parameter optimization of the observation system for the South Yellow Sea strong shielding layer based on seismic illumination analysis  

基于地震照明分析的南黄海强屏蔽层观测系统参数优化

作　　者：Yang Jia-Jia Chen Jian-Wen Huang Fu-Qiang Yan Zhong-Hui Lei Bao-Hua Wang Xiao-Jie Xu Hua-Ning Liu Hong 杨佳佳;陈建文;黄福强;颜中辉;雷宝华;王小杰;徐华宁;刘鸿(中国地质调查局青岛海洋地质研究所,青岛266237;青岛海洋科技中心海洋矿产资源评价与探测技术功能实验室,青岛266237;中石化海洋石油工程有限公司上海物探分公司,上海201208)

机构地区：[1]Qingdao Institute of Marine Geology,China Geological Survey,Qingdao,266237 [2]Laboratory for Marine Mineral Resources,Qingdao Marine Science and Technology Center,Qingdao,266237 [3]Shanghai Geophysical Branch,Sinopec Off shore Oilfi eld Services Company,Shanghai,201208,China

出　　处：《Applied Geophysics》2025年第1期84-98,233,共16页应用地球物理(英文版)

基　　金：“High precision prestack reverse time depth migration imaging of long array seismic data in the East China Sea Shelf Basin”of the National Natural Science Foundation of China(No.42106207);“Seismic acquisition technology for deep strata under strong shielding layers in the sea and rugged seabed”of Laoshan Laboratory Science and Technology Innovation Project(No.LSKJ202203404);“Research on the compensation methods of the middledeep weak seismic reflections in the South Yellow Sea based on multi-resolution HHT time-frequency analysis”of the National Natural Science Foundation of China(No.42106208).

摘　　要：The seismic data of the Laoshan Uplift in the South Yellow Sea Basin reveal a low signal-tonoise ratio and low refl ection signal energy in the deep Mesozoic–Paleozoic strata.The main reason is that the Mesozoic-Paleozoic marine carbonate rock strata are directly covered by the Cenozoic terrestrial clastic rock strata,which form a strong shielding layer.To obtain the reflection signals of the strata below the strong shielding layer,a one-way wave equation bidirectional illumination analysis of the main observation system parameters was conducted by analyzing the mechanism of the strong shielding layer.Low-frequency seismic sources are assumed to have a high illumination intensity on the reflection layer below the strong shielding layer.Accordingly,optimized acquisition parameter suggestions were proposed,and reacquisition was performed at the existing survey line locations in the Laoshan Uplift area.The imaging of the newly acquired data in the middle and deep layers was drastically improved.It revealed the unconformity between the Sinian and Cambrian under the strong shielding layer.The study yielded new insights into the tectonic and sedimentary evolution of the Lower Paleozoic in the South Yellow Sea.南黄海盆地崂山隆起地震资料深部中-古生代地层信噪比低,反射信号能量弱,原因主要是新生代陆相碎屑岩地层直接覆盖在中-古生代海相碳酸盐岩地层之上,构成了一个强屏蔽层。为了获得该强屏蔽层以下地层的反射信号,在分析强屏蔽层产生机制的基础上,进行主要观测系统参数的单程波方程双向照明度分析,认为富低频的震源对强屏蔽层以下反射层具有更高的照明强度。据此提出优化的采集参数建议,并在崂山隆起区已有测线位置进行重新采集,新采集数据在中深层的成像效果得到明显改善,清晰揭示了强屏蔽层下震旦系与寒武系的不整合面,为研究南黄海下古生界构造沉积演化提供了新认识。

关 键 词：illumination analysis acquisition parameters Laoshan Uplift strong shielding layer 

分 类 号：P61[天文地球—矿床学]