等效流体体积模量直接反演的流体识别方法

发布时间：2018-03-18 21:02

  本文选题：等效流体体积模量　切入点：直接反演　出处：《石油地球物理勘探》2017年02期 　论文类型：期刊论文

【摘要】：流体因子构建对储层流体识别具有重要意义。基于等效介质理论,将体积模量中体现流体效应的部分定义为等效流体体积模量。岩石物理分析表明,等效流体体积模量对于岩石孔隙内流体类型更加敏感,叠前地震反演可以有效获得等效流体体积模量。借助多孔弹性介质岩石物理模型,建立了Gassmann流体项与等效流体体积模量的直接关系,推导了基于等效流体体积模量的Zoeppritz方程的近似方程以及弹性阻抗方程,实现了基于弹性阻抗的等效流体体积模量直接反演。模型试算验证了方法的可行性,实际资料应用表明基于等效流体体积模量直接反演提高了流体识别准确度。
[Abstract]:Fluid factor construction is of great significance for reservoir fluid identification. Based on the theory of equivalent medium, the part of volume modulus that reflects fluid effect is defined as equivalent fluid volume modulus. The equivalent fluid volume modulus is more sensitive to the fluid types in rock pores, and the equivalent fluid volume modulus can be obtained effectively by pre-stack seismic inversion. The direct relationship between the Gassmann fluid term and the equivalent fluid volume modulus is established. The approximate equations and the elastic impedance equations of the Zoeppritz equation based on the equivalent fluid volume modulus are derived. The direct inversion of equivalent fluid volume modulus based on elastic impedance is realized. The feasibility of the method is verified by the model test. The application of practical data shows that the accuracy of fluid identification is improved based on the direct inversion of equivalent fluid volume modulus.
【作者单位】： 中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家自然科学基金石油化工联合基金重点项目“非常规油气富集机制与地球物理甜点识别”(U1562215) 国家油气重大专项(2016ZX05024-004) 中国博士后科学基金项目(2014M550379)联合资助
【分类号】：P631.4;P618.13
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本文编号：1631293