基于高密度速度分析的天然气水合物地震资料各向异性参数分析

Anisotropy Parameters Analysis of Gas Hydrate Seismic Data Based on High Density Velocity Analysis

在天然气水合物地震资料处理中,经过基于双曲线的高密度速度分析后,远炮检距数据仍然存在较大的剩余动校正量,分析认为:火成岩各向异性和垂向速度变化引起非双曲线时差,利用近炮检距地震数据得到均方根动校正速度,同时采用扫描法和旅行时法分别得到可以相互验证的各向异性参数,用提取的各向异性参数进行各向异性速度分析,剩余动校正得到消除,成像效果有显著改善。

During gas hydrate seismic data processing, there are still large amount of residual moveout in far offset data after high density velocity analysis based on hyperbola. It is considered by analysis that nonhyperbolic time difference is caused by anisotropic of igneous rock and transformation of vertical velocity. The paper can get rms nmo velocity by near offset seismic data, and obtain anisotropic parameters from scanning method and traveling time method. Then the paper applies it into anisotropy velocity analysis. The remaining NMO is eliminated, andimaging results have been improved significantly.