宽方位数据的炮检距向量片域处理及偏移道集校平方法

炮检距向量片(offset vector tile,OVT)是一种新颖的叠前数据编排方式,当地震数据分选到OVT域后,地震资料的各种属性特征表现得更加明显,充分利用这些特征,可以改善噪声压制、振幅均衡、数据规则化等各种处理过程的效果。OVT道集偏移后的CRP道集(CRP gather after OVT migration,OVG)含有方位各向异性信息,同相轴随观测方位的变化而明显起伏,典型表现形式是“蜗牛道”，可以用于方位各向异性研究。采用非刚性匹配(non-rigid matching,NRM)技术能有效校平“蜗牛道”,改善成像效果,提高AVO分析精度。实际的宽方位资料处理结果表明,经过OVT域预处理和道集校平,其处理成果可以分析振幅随倾角和方位角的变化(amplitude versus angle and azimuth,AVAZ),进行分方位裂缝预测。OVT域处理是宽方位三维地震资料的一种有效的处理方法。

Offset vector tile (OVT) is an entirely new prestack data arrangement means.Some attributes of seismic data are more evident when the seismic data sorted into OVT domain,so we could make full use of these features to improve the effects of noise suppression,amplitude balance,data regularization and so on.CRP gathers after OVT migration (OVG) contains azimuthal anisotropy information,so it fluctuates in pace with the azimuth varying,a typical manifestation is so called ‘snail trace’.Using non-rigid matching (NRM) technology can effectively flattening this kind of fluctuates in gathers so as to improve the accuracy of imaging and AVO analysis.The results of real wide-azimuth seismic data processing show that the CRP gathers after OVT migration and flattening could meet the requirements of the sub-directional fracture prediction and AVAZ analysis.OVT domain processing is an effective approach for wide azimuth three-dimensional data.