南海深水复杂海底区地震物理模拟采集及效果分析

Physical simulation of seismic acquisition and its effect analysis in complex geomorphic deep water areas in the South China Sea

针对南海深水区复杂的海底地貌和地质构造,建立了典型的地震物理模型,通过实验室模拟采集,对比分析了海底淤泥和划痕、水深、采集方向等因素对地震采集和成像质量的影响,并在琼东南盆地陡坡海底区开展了野外双向采集试验验证,结果表明利用地震物理模拟技术能够深入认识深水区复杂海底地貌和地质构造对地震采集和成像质量的影响,可以有效指导南海深水复杂海底地貌区地震勘探。

A typical physical model of seismic acquisition is developed to simulate the complex geomorphic deep water areas with complex geologic structures in the South China Sea. Through physical simulation, the influ- ences of soft seabed mud, seabed roughness, water depth and acquisition directions on seismic acquisition and imaging are analyzed. Bidirectional acquisition pilot tests are carried out in slope seabed area of Qiongdongnan basin. The tests verified that the physical simulation technique is a useful method in analyzing the influence of deep water, complex geomorphic seafloor and geologic structure on seismic acquisition and imaging, and is a potential guidance for seismic prospecting in complex geomorphic deep water areas in the South China Sea.