利用基于Russell近似的弹性波阻抗反演进行储层描述和流体识别  

Utilizing Russell Approximation-based elastic wave impedance inversion to conduct reservoir description and fluid identification

作　　者：印兴耀[1] 张世鑫[1] 张繁昌[1] 郝前勇[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院,山东青岛266555

出　　处：《石油地球物理勘探》2010年第3期373-380,共8页Oil Geophysical Prospecting

基　　金：国家高技术研究发展计划(863)(项目编号:2006AA09A102);国家重点基础研究发展计划(973)(项目编号:2007CB209605)资助

摘　　要：本文基于Russell提出的多孔流体饱和弹性介质的佐普里兹方程形式的近似公式,借鉴弹性波阻抗的原理,推导了标准化的以流体因子f、拉梅常数μ和密度ρ表示的新的弹性波阻抗公式。通过反演可以直接从弹性波阻抗数据体中提取流体因子f和拉梅常数μ数据体,从而将弹性波阻抗与流体因子联系起来,兼顾了常规弹性波阻抗反演的高抗噪性以及利用流体因子识别流体的直观性,并且流体因子f的直接提取方法减少了间接计算的误差累积过程,为储层流体预测提供了一种新的途径。利用文中方法在SL油田Y3工区提取的流体因子f可以有效地区分出不同的流体类型,流体因子f对流体类型的敏感程度要优于其他常规属性,对沙二段储层流体的识别更加准确可靠,在储层流体识别与寻找剩余油方面显示了较好的应用效果。Based on Zeoppritz equation’s approximation formula of porous liquid-saturated viscoelastic media which was proposed by Russell,new normarised elastic impedance formula which were expressed by fluid factor,Lame Constants and density were derived based on elastic impedance principle,and the fluid factor,Lame Constants could be directly extracted from elastic impedance data volume through inversion,as a result the elastic impedance and fluid factor can be linked by taking advantages of high anti-noise of conventional elastic impedance and visibility of the fluid identification by using fluid factor,moreover the direct extraction method for fluid factor decreases the error accumulation in indirect calculation,providing a new way for reservoir fluid prediction.By using fluid factor which was extracted from Y3 area in SL Oil-field with the method introduced in this paper,the different fluid types can be effectively classified,the sensitivity of the fluid factor to fluid type is better than other conventional attributes,its identification to 2nd member of Shahejie Formation is more accurate,and the good application effects were achieved for reservoir fluid identification and residual oil searching.

关 键 词：Russell近似 弹性波阻抗 反演 流体因子 储层预测 流体识别 

分 类 号：TE321[石油与天然气工程—油气田开发工程]