在成像空间中衰减多次波方法研究  

The study of multiple attenuation in the image space

作　　者：井涌泉[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《地球物理学进展》2009年第5期1710-1716,共7页Progress in Geophysics

基　　金：国家自然科学基金(40474046)项目资助

摘　　要：在偏移后成像空间中的共成像点道集中可以对多次波进行衰减,对于给定的偏移速度模型,一次波与多次波在叠前偏移后的共成像点道集中具有不同的动校时差,这样我们就可以使用类似于偏移前衰减多次波的方法将一次波和多次波进行分离.本文在成像空间中应用抛物Radon变换分离多次波和有效波,由于每个共成像点道集都包含了复杂三维波场传播效应,所以本文方法具有处理三维数据和复杂地下构造的能力.相比于SRME以及传统Radon变换衰减多次波方法,本文方法能够在保持较小的计算量的同时,保证了衰减多次波的准确性.通过对模型数据试算和对实际数据的处理验证了本文方法在叠前时间偏移后衰减多次波的能力,并取得了很好的成像效果.Multiples can be attenuated in the offset-domain image space after migration. For a given velocity model, primaries and multiples have different offset-domain moveout and therefore ,can he separated using techniques that are employed in the data space before migration. We use Radon transforms in the image space to separate primaries and multiples. Since every individual offset-domain common-image gather incorporates complex 3D propagation effects, our method has the advantage of working with 3D data and complicated geology. Compare to SRME and conventional Radon transforms multiple attenuation methods, our method not only can keep less computation but also guarantee the accuracy of multiple attenuation . Testing on synthetic and real data, we demonstrate the power of the method in discriminating between primaries and multiples after pre-stack time migration, and obtain a good migration section.

关 键 词：叠前时间偏移 共成像点道集 RADON变换 衰减多次波 

分 类 号：P631[天文地球—地质矿产勘探]