基于一维弹性阻尼波动理论的沙丘Q吸收补偿  

Sand-dune Q absorption compensation based on 1-D elastic damping wave theory

作　　者：凌云[1] 高军[1] 张汝杰[1] 

机构地区：[1]石油地球物理勘探局研究院

出　　处：《石油地球物理勘探》1997年第6期795-803,841,共10页Oil Geophysical Prospecting

摘　　要：凌云，高军，张汝杰．基于一维弹性阻尼波动理论的沙丘Q吸收补偿．石油地球物理勘探，1997，32（6）：795～803，841塔克拉玛干沙漠是世界上第二大沙漠，最高的沙丘可达300m左右。鉴于该区的短波长静校正已基本解决，目前的主要困难是资料的低信噪比和低分辨率问题。为此，本文从沙漠地区实际地震资料的分析入手，提出了基于一维弹性阻尼波动理论的沙丘Q吸收补偿方法。这一方法不仅克服了从低信噪比资料中求取子波的困难，而且避开了由沙丘起伏、激发深度与能量的大小、频率高低等的变化所带来的影响，能较好地依靠沙丘起伏的物理机制来补偿沙丘高低引起的Q吸收的能量变化。通过实际数据的试算，获得了较好的效果。Takelamagan desert is the second biggest desert in the world, where the high-est sand-dune may be 300m or so. In this area,the tough short-wavelength static correction has been coped with quite desirably; so the main troubles are low signal/ noise ratio and low resolution of seismic data. After the detailed analyses of seismic data in the area, we put forward a new method,sand-dune Q absorption compensa-tion based on 1-D elastic damping wave theory. The method removes the difficulty in deriving wavelets from low signal/noise ratio data,avoids the influences resulting from the variations of sand-dune undulation, shot depth, energy and frequency. So it can rely on the physical mechanism of sand-dune undulation to compensate the Qabsorption variation that results from sand-dune undulation. Quite good outcome has been obtained in real data processing.

关 键 词：一维弹性阻尼 波动 Q吸收补偿 沙丘 地震勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]