海水层静校正的综合解决方案研究

大面积的海上三维地震勘探经常需要数月的采集周期,采集期间的海水层潮汐现象及物性变化会产生诸如潮汐校正和冷水校正等严重的静校正问题。现论述了一种综合的水层静校正方法来解决上述问题。该方法是通过在CDP道集上拾取水底、反演水底时间求取水速、水底倾角和方位角,根据拾取的水底时间和测算的水速度求取并应用冷水校正,然后用求取的零偏移距到达时间与参考时间的差值计算并应用潮汐校正。该方法在某深水区三维地震资料的应用上取得了明显的效果。

Study on Comprehensive Solutions for Seawater Static correction

In offshore exploration activities, 3D seismic data acquisition always lasts for several months. During this long period, the off-shore physical conditions have big changes, including ocean tides, water temperature and saline concentration, which lead to the of static correction problems of tidal correction and cold water correction and so on. This paper discusses a comprehensive seawater static correction method to solve these problems.The method is based on picking up seafloor on CDP gathers, inverting seafloor time for water velocity, seafloor dip and azimuth, according to the picked seafloor time and measured water velocity calculating and application of cold water correction, according to the differential time of the zero offset arrival time and the reference time calculating and application of tidal correction.The method has achieved significant results in the application of 3D seismic data in the South China sea.