节点文献

Walkaway井地联合地震资料Q值波形反演方法

Waveform Inversion for Q Estimation on Walkaway VSP and Surface Seismic Data

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 杨宇山李媛媛刘天佑

【Author】 YANG Yu-shan, LI Yuan-yuan, LIU Tian-you (College of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, Hubei, China)

【机构】 中国地质大学(武汉)地球物理与空间信息学院

【摘要】 传统的品质因子Q值估算方法通常是基于VSP资料或者叠加的地面地震资料,在薄互层存在的情况下,它们难以提取地震子波及有效地分离固有衰减和散射衰减。为了获得更可靠的地震波衰减图像,研究采用了一种基于Walkaway井地联合地震资料的波形反演来求取Q值的方法。通过理论模型的数值计算分析,探讨了初始模型厚度、Q值及噪声对反演结果的影响。合成的Walkaway井地联合地震资料的衰减估计结果表明,波形反演的Q值估算方法充分利用了各种波的运动学和动力学信息,避免了初至拾取和波场分离等处理困难,并能减小可能的人为误差,提高计算的精度。将该方法用于某油田的高分辨Walkaway井地联合地震资料Q值估计,结果表明,介质品质因子Q与介质性质和孔隙流体有良好的对应关系。

【Abstract】 Traditional Q estimation methods were generally based on VSP data or stacked surface seismic data. They are incapable of extracting wavelets and distinguishing the inherent attenuation from the scattering attenuation in the presence of thin interbeds. To obtain a more reliable Q image, a waveform inversion method was developed for estimating Q from the walkaway VSP and surface seismic data. By calculation with theoretical model, the effects of thickness and Q value of the initial mode, as well as the noise on the inversion results were discussed. Theoretical modeling indicates that the waveform inversion for Q estimation can avoid the difficulties in first break pickup and wave field separation by fully utilizing the kinematic and dynamic information of seismic waves. It can also reduce the possible artificial errors, and improve calculation accuracy. The method is used in a certain oil field for estimating the Q from the walkaway VSP and surface seismic data, the result shows that the quality factor Q corresponds well with petrophysics characters of reservoirs.

【基金】 中国地质大学(武汉)优秀青年教师计划资助项目(CUGQNL0726)资助
  • 【文献出处】 石油天然气学报 ,Journal of Oil and Gas Technology , 编辑部邮箱 ,2009年02期
  • 【分类号】P631.44
  • 【被引频次】3
  • 【下载频次】245
节点文献中: 

本文链接的文献网络图示:

本文的引文网络