Abstract：
The seismic data of the Laoshan Uplift in the South Yellow Sea Basin reveal a low signal-to-noise ratio and low reflection 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 measurement line positions 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 systems under the strong shielding layer. The study yielded fresh insights into the tectonic and sedimentary evolution of the South Yellow Sea during the Lower Paleozoic era.
基金资助:This work was supported by the “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), the “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), and the “Research on the compensation methods of the middle-deep 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).
作者简介: Yang Jia-Jia, an associate researcher, received her PhD degree in geophysical prospecting from the Ocean University of China in 2015. She currently works at the Qingdao Institute of Marine Geology, with her research interests being seismic wave theory and multi-wave seismic technology and multicomponent seismic wave reverse time depth migration.
. Parameter optimization of the observation system for theSouth Yellow Sea strong shielding layer based on seismic illumination analysis[J]. APPLIED GEOPHYSICS, 2025, 22(1): 84-98.
2025, Vol. 22 
