炮检距矢量道集非刚性匹配方位各向异性时差校正

随着勘探精度日益提高,宽方位地震资料的方位各向异性问题变得更加突出。介质的方位各向异性会导致地震成像道集中反射点的道间时差,且常规处理方法难以正确消除,影响成像结果的保真度和分辨率。基于"两宽一高"的实际地震数据,分析研究区方位各向异性在炮检距向量片(OVT)域偏移后形成的OVG道集上的表现特征,采用非刚性匹配(NRM)时差校正方法获得时空变的校正量,消除方位各向异性对成像的影响,实现了整体数据的方位各向异性时差校正。与常规处理结果相比,该方法改善了成像品质,频带展宽7 Hz左右,有助于提高储层描述精度。

Azimuthal anisotropy moveout correction by non-rigid matching for the offset vector gather

With the increasing accuracy of the exploration, the problem of the azimuthal anisotropy of the wide-azimuth seismic data has become more highlight. The azimuthal anisotropy of the medium causes the inter-trace moveout of the reflecting points of the seismic imaging trace gather, while the conventional processing method is difficult to eliminate the moveout correctly, thus the fidelity and resolution of the imaged result are influenced. Based on the actual “two width and one height” seismic data, the performance characteristics of the azimuthal anisotropy in the study area on the offset vector gathers in the offset vector tile (OVT) domain were analyzed. With the help of non-rigid matching (NRM) moveout correcting method, the correction of space-time variation was obtained, the influence of the azimuthal anisotropy on the imaging was eliminated, thus the azimuthal anisotropy moveout correction of the whole data was realized. Compared with the conventional processed results, the method improves the imaged quality, and moreover the band broadening is up to 7 Hz or so, therefore the reservoir characterized accuracy can be improved to a certain degree.