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针对南黄海盆地深层地震地质条件差,地震波受屏蔽.能量严重哀减,在海洋反射地震资料中很难识别反映中-古生界的反射地震波组,不能满足南黄海盆地前第三系油气资源前景评价的需要等问题,于2006年5月.开展了南黄海海域海底大地电磁测深试验,在盆地内五莲斜坡和胶州凹陷区布设了3个海底大地电磁测深点,取得了可靠的海底观测数据.本文详细阐述了海底大地电磁测深与常规大地电磁测深在数据处理方法上的差别,论述了海洋电磁噪声对海底大地电磁场观测的影响,提出了海底大地电磁场实测资料“水平姿态”校正、“方位”校正和“海洋电磁噪声”校正的方法.通过对试验观测资料的处理和反演,并结合地质、物性资料进行综合分析,结果表明在南黄海盆地海底以下深部还存留有古生代地层,这对于南黄海前第三系含油气前景的评价具有重要意义.试验结果也证明了海底大地电磁测深技术在研究古生代残留盆地方面的问题可以发挥相当好的作用.
In view of the poor geological conditions of the deep seismic in the southern South China Sea, the seismic waves are shielded and the energy is greatly reduced. It is difficult to identify the reflected seismic wave sets reflecting the Meso-Paleozoic in the marine reflection seismic data and can not meet the requirements of the former Tertiary oil and gas resources The need for future assessment and other issues, in May 2006. carried out the South Yellow Sea seabed terrestrial electromagnetic sounding test in the basin Wulian slope and Jiaozhou depression set up three submarine geomagnetic sounding sounding points, made a reliable This paper elaborates the differences between the methods of data processing on the seafloor magnetotelluric sounding and the conventional magnetotelluric sounding, discusses the influence of marine electromagnetic noise on the observation of the seafloor magnetotelluric field, and presents the measured data of the seafloor magnetotelluric field Attitude correction “,” azimuth “correction and” marine electromagnetic noise "correction method.According to the processing and inversion of the experimental observation data and the comprehensive analysis of geological and physical data, the results show that in the South Yellow Sea Basin The Paleozoic strata still exist in the deep below the seafloor, which is of great significance for the evaluation of the petroleum prospect of the Tertiary in the southern Yellow Sea. Clear marine magnetotelluric sounding technology can play a very good role in the study of Paleozoic residual basin problems.