共反射面元叠加波场属性参数的应用  

Application of attribute parameter of common reflection surface (CRS) stack wave field

作　　者：覃天[1] 段云卿[1] 赵勇[2] 

机构地区：[1]中国地质大学.北京 [2]新疆油田分公司研究院

出　　处：《石油地球物理勘探》2006年第5期530-533,共4页Oil Geophysical Prospecting

摘　　要：共反射面元叠加是一种获得与宏观速度模型无关的零炮检距剖面的方法。该法利用出射到地表的零炮检距射线的出射角α、出射到地表的Normal波和NormalIncidencePoint波的波前曲率半径三个地震波场属性参数描述反射界面与走时的关系。通过对共反射面元双曲型时距关系式进行泰勒二阶展开,求得CRS叠加公式。由于这种叠加方法考虑到了地下反射面不同的几何状态,而且是在一个菲涅尔带内的叠加,所以此法更加接近实际的地下地质情况。对模型和实际地震资料的处理表明:应用此法不仅可以极大地提高地震资料的信噪比和连续性,而且可以获得三个地震波场属性参数,有利于提高地震波速度反演的精度、剩余静校正量的求取精度以及AVO分析的效果。The common reflection surface (CRS) stack is an approach acquiring zero-offset section, which is unrelated to macro velocity model. The method uses three parameters of seismic wave field attributes: the emerged angle α of zero-offset ray emerging to surface, wavefront curvature radiuses of Normal wave emerging to surface and Normal Incidence Point wave to describe relationship between reflector and travel time. The CRS stack formula is deduced by second order Tailor expansion of CRS hyperbolic time-distance relationship. Because the stack considers different geometry of underground reflectors and is stack within the Fresnel zone, the method more approaches to real underground geologic situation. The model test and processing of practical seismic data showed that application of the approach not only greatly improved the S/N ratio and continuity of seismic data, but also can acquire three parameters of seismic wavefront attributes, benefit to improve the precisions of seismic velocity inversion and computed residual statics as well as the effect of AVO analysis.

关 键 词：共反射面叠加 波场属性 剩余静校正 速度反演 AVO分析 

分 类 号：P631.4[天文地球—地质矿产勘探]