模型预测多次波衰减技术及其在莺歌海地区的应用

MODEL PREDICTION OF MULTIPLE ELIMINATIONON IN YINGGEHAI BASIN

摘要: 莺歌海盆地是中国海域新生代主要含油气盆地之一。盆地内超压沉积现象分布广泛,超温超压现象普遍。由于超温超压现象的存在,导致其多次波与有效波在速度上更接近,衰减难度更大。通过合理利用基于波动理论的多次波建模方法并组合其他方法有效衰减了浅水多次波。莺歌海地区的应用实例证明了该方法的有效性,不仅较好地衰减了多次波,提高资料信噪比,同时提高了地震数据的分辨率,改善了资料的波组特征。

Abstract: The Yinggehai basin is a Cenozoic petroliferous basin in offshore China. Overpressure and overtemperature deposits are widely distributed in the basin. It makes the seismic multiple similar to the primary in both frequency band and velocity, so the multiple is very difficult to be attenuated. In this article we provided two kinds of method for shallow water multiple attenuation in the Yinggehai basin. It is proved that the methods are effective to get high SNR and high resolution.