基于基追踪弹性阻抗反演的深部储层流体识别方法

发布时间：2017-12-27 00:09

本文关键词：基于基追踪弹性阻抗反演的深部储层流体识别方法　出处：《地球物理学报》2016年01期 　论文类型：期刊论文

【摘要】：深部储层地震资料通常照明度低、信噪比低、分辨率不足,尤其是缺乏大角度入射信息,对深部储层流体识别存在较大影响.Gassmann流体项是储层流体识别的重要参数,针对深层地震资料的特点,本文首先在孔隙介质理论的指导下,推导了基于Gassmann流体项与剪切模量的两项AVO近似方程.通过模型分析,验证了该方程在小角度时与精确Zoeppritz方程误差很小,满足小角度入射条件下的近似精度要求.然后借助Connolly推导弹性阻抗的思想,推导了基于Gassmann流体项与剪切模量的两项弹性阻抗方程.针对深部储层地震资料信噪比差的特点,利用奇偶反射系数分解实现了深部储层基追踪弹性阻抗反演方法,最后提出了基于基追踪弹性阻抗反演的Gassmann流体项与剪切模量的求取方法,并将提取的Gassmann流体项应用于深部储层流体识别.模型测试和实际应用表明该方法稳定有效,具有较好的实用性.
[Abstract]:Deep reservoir seismic data usually lighting degree is low, low signal-to-noise ratio and resolution of problems, especially the lack of information on the incident angle, the deep reservoir fluid identification has great influence.Gassmann fluid is an important parameter in reservoir fluid identification, according to the characteristics of deep seismic data, this paper first in the guidance of theory of porous medium next, Gassmann derived fluid and shear modulus of two AVO based on the approximate equation. Through the analysis of the model, verify the equation in the small angle and accurate Zoeppritz equation error is very small, the approximate precision small incident angle under the condition of demand. And with the help of Connolly derivation of elastic impedance theory, deduced Gassmann fluid shear modulus and elastic impedance equation based on the two. For the deep reservoir seismic data of poor signal-to-noise ratio, using the parity reflection coefficient decomposition realizes deep reservoir based elastic track Impedance inversion method, finally put forward the basis pursuit of elastic impedance inversion of Gassmann fluid with shear modulus calculation method based on the Gassmann and the extraction fluid used in deep reservoir fluid identification. The model test and practical application show that this method is stable and effective, practical.
【作者单位】：中国石油大学(华东)地球科学与技术学院;
【基金】：国家自然科学基金石油化工联合基金重点项目(U1562215) 国家重点基础研究发展计划(973)项目(2013CB228604) 国家科技重大专项(2011ZX05030-004-002,2011ZX05006-002,2011ZX05009-003) 中国博士后基金青岛市博士后启动项目中石化重点实验室基金(WTYJY-WX2014)联合资助
【分类号】：P631.4
【正文快照】： 1引言随着能源需求加大,深部储层逐渐成为重要的研究目标,探索深部储层的叠前地震反演方法与储层流体识别方法成为当前研究的热点.流体因子成为当前“定量”储层流体识别的重要方法.Smith和Gidlow(1987)利用纵横波速度相对变化的加权差识别储层流体,并首先提出了“流体因子”

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