摘要
以双相介质理论为指导构建的拟流体模量参数可以减小岩石骨架孔隙度等固体效应造成的流体识别假象.基于Biot-Gassmann双相介质理论,利用流体替代技术分析了Gassmann流体/孔隙项与储层岩石固体骨架孔隙度之间的关系,根据岩石物理统计分析结果对Gassmann流体/孔隙项与剪切模量坐标轴进行合理旋转,构建了对孔隙流体效应更为敏感的流体因子—拟流体模量.利用基于Russell近似的弹性阻抗反演技术进一步研究了一套利用拟流体模量进行储层流体识别的方法,通过实际资料应用以及地震尺度流体因子敏感性定量分析发现,相比较其他常规流体因子,拟流体模量参数能够有效的减小岩石孔隙度对储层流体判识产生的影响,实现了储层孔隙流体类型的敏感表征.
The quasi fluid modulus constructed based on the two-phase media theory can diminish the artifact caused by the matrix porosity in the fluid identification. Based on the Biot-Gassmann two-phase theory, we analyze the relationship of Gassmann fluid/porosity term and the matrix porosity using the fluid substitution technology. With the help of rock physics statistics analysis result, a more sensitive fluid factor called quasi fluid modulus is constructed by the rotation of axes of Gassmann fluid/porosity term and shear modulus, which highlights the effect of pore fluid. The fluid identification method using quasi fluid modulus is proposed further with the Russell approximation-based elastic impedance inversion method. The real application and quantitative sensitivity analysis of seismic-scale fluid factor showed that the quasi fluid modulus can diminish the negative effect of porosity to the fluid identification and the new fluid factor was more sensitivity to the different pore-fluid types, which can reduce the ambiguous of reservoir prediction and fluid discrimination.
出处
《地球物理学进展》
CSCD
北大核心
2013年第6期2911-2918,共8页
Progress in Geophysics
基金
973项目(2013CB228604)
国家科技重大专项(2011ZX05009-003)
国家科技重大专项(2011ZX05030-004-002)联合资助
关键词
双相介质理论
流体因子
流体识别
孔隙度
two-phase media theory
fluid factor
fluid identification
porosity
