基于Backus平均的地震尺度岩石物理分析方法研究.docVIP

  基于 Backus 平均的地震尺度岩石物理分析 方法研究# 曹丹平* 5 10 15 20 25 30 35 40 （中国石油大学（华东）地球科学与技术学院,青岛 266580） 摘要：三维地震资料具有全面反映地下地质信息的能力，而测井曲线则精确的反映了井点处 的储层和岩石物理信息，两者之间在尺度上的差异对地震尺度下的储层预测和流体识别提出 了挑战。对测井曲线开展尺度粗化方法研究，在地震尺度下实现有针对性的岩石物理特征分 析对于叠前地震反演的研究与应用具有重要意义。本文采用 Backus 平均方法开展测井资料 的尺度粗化方法研究，讨论了滑动时窗扫描、参考频率和重采样厚度等参数对尺度粗化结果 的影响，在此基础上对比分析了测井曲线尺度粗化前后的岩石物理特征，讨论了地震和测井 尺度下岩石物理分析结论之间的联系与差异。采用 Backus 尺度粗化方法实现大尺度下的岩 石物理特征分析不仅为地震尺度下的储层预测和流体识别奠定了基础，同时也促进了地震储 层预测的定量描述。 关键词：Backus 方法；尺度粗化；岩石物理 中图分类号：P631.4 Rock physics analysis at seismic scale based on Backus average method CAO Danping (School of Geosciences, China University of Petroleum (Huadong), Qingdao 266580) Abstract: 3D surface seismic has the advantage of prosepcting the whole subsurface geology body, well logging curves present the reservoir and rock physics information at the borehole location. It is a big challenge for the reservoir prediction and fluid identification because of the scale difference between surface seismic data and well logging data. The upscaling of well logging cureve is very important for prestack seismic inversion and application, because the rock physics characteristics can be analysed at the seismic scale with the upscaling of logging data. The Backus averaging method is adapted in this article, the parameters of running window, reference frequency and the resample thickness are discussed for this upscaling method. The rock physics characteristics are analysed based on the upscaling logging curves, the connection and difference for the raw logging curves and upscaling results have been discussed. The rock physis conclusions at seismic scale based on Backus method is the basis for reservoir prediction and fluid identification, which is benefical to the quantitative description of seismic reservoir prediction. Key words: Backus averaging; Upscaling; Rock physics 0 引言 测井资料是地震资料分析过程中不可或缺的重要资料，基于测井资料的井震精细标定、 储层建模和岩石物理分析等工作奠定了叠前地震反演、储层预测和流体识别的基础。然而受 储层非均质性、工作频率、观测方式的影响，测井资料与地震资料的分辨尺度差异较大，三 维地面地震数据横向连续性好但纵向分辨率较低，分辨能力在